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21/07/2022, 06:00
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Jo Ressler (LLNL)22/07/2022, 09:00
Chair: Ali Dreyfuss
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Richard Hughes (LLNL)22/07/2022, 10:05
Chair: Erin Good
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Brett Carlson22/07/2022, 11:20
Chair: Amy Lovell
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Ramona Vogt (LLNL, UC Davis)22/07/2022, 13:20
Chair: Marc Verriere
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Denise Neudecker22/07/2022, 14:30
Chair: Robert Casperson
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22/07/2022, 15:30
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Kim Budil (LLNL)25/07/2022, 06:00
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William D. Magwood (NEA Director General)25/07/2022, 06:15
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Alexandra Gade (FRIB)25/07/2022, 07:30
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Karl-Heinz Langanke (GSI)25/07/2022, 08:00
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Naomi Marks (LLNL)25/07/2022, 08:30
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Adrian Sanchez Caballero25/07/2022, 09:30
The data analysis of neutron cross section measurements is a critical step for generating high quality and reliable nuclear databases [1-4] to be used in the fields of nuclear technologies, radioprotection, nuclear medicine or astrophysics, among others. Artificial intelligence techniques, and in particular deep learning, have proven to be a very useful tool for data recognition and analysis....
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Alberto Mengoni, The n_TOF Collaboration25/07/2022, 09:30
Based on an idea by Carlo Rubbia, the n_TOF facility has been operating during the last 20 years at CERN. n_TOF is a spallation neutron source, driven by the 20 GeV/c proton beam from the CERN PS accelerator. A massive Lead spallation target is feeding two experimental areas set at 185 meters (EAR1, horizonal with respect to the proton beam direction) and at 20 meters (EAR2, in the vertical...
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Grégoire Kessedjian (CEA Cadarache IRESNE/DER/SPRC/LEPh)25/07/2022, 09:30
From fission yield measurements to evaluation: correlations of multi-observable analysis
S.M. Cheikh 1, G. Kessedjian 1, A. Chebboubi 1, O. Serot 1 and C. Sage 21 CEA, DES, IRESNE, DER, SPRC, LEPh, Cadarache center, F-13108 Saint Paul lez Durance, France
2 LPSC, Université Grenoble-Alpes, CNRS/IN2P3, 38026 Grenoble, FranceTopics for submission: Fission yield evaluation
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Keywords: fission... -
Mr Juan Peñas25/07/2022, 09:30
The development of novel medical imaging techniques like PET (Positron Emission Tomography) or SPECT (Single-Photon Emission Computed Tomography) has led to the increase in the demand of nuclear radioisotopes for medical diagnostics. At present, radioisotope production for medical imaging and treatment is principally done at conventional accelerators (cyclotrons) and dedicated nuclear...
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7. New developments in fission studies within the time-dependent density functional theory frameworkAurel Bulgac25/07/2022, 09:30
LA-UR-21-28456
We have extended significantly our description of fission by examining a larger set of observables and more nuclei. We extract neutron and proton numbers of fission fragments, their spins and fission fragments relative orbital angular momentum and their correlations, investigate neutrons emitted at or shortly after scission, excitation energy sharing mechanism, total kinetic...
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Dr Arjan Koning (IAEA)25/07/2022, 09:30
The TALYS Evaluated Nuclear Data Library (TENDL) had 11 releases since 2008. A
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number of achievements has been realized, translated in a growing user group, as well
as a high interaction with other library projects. The backbone of this achievement
is simple and robust: completeness, quality and reproducibility. In this presentation,
the strong points of TENDL will be outlined, as well as the... -
Mr Daniel Lopez Aldama (IAEA/Consultant)25/07/2022, 09:54
Since 2016 the Nuclear Data Section of the International Atomic Energy Agency (NDS/IAEA) has encouraged the development of new codes for processing evaluated nuclear data for applications. The main motivation has been the need for improving processing methods and avoiding common failure modes. In the frame of this effort, the NDS/IAEA has supported the development of the processing system...
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Dr M. S. Uddin (Institut für Neurowissenschaften und Medizin, INM-5:Nuklearchemie, Forschungszentrum Jülich, D-52425 Jülich, Germany; Tandem Accelerator Facilities, INST, Atomic Energy Research Establishment, Savar, Dhaka, Bangladesh), Dr Shamsuzzoh Basunia (Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA)25/07/2022, 09:54
In nuclear medicine, the positron emitting $^{86}$Y (14.7 h) is an emerging imaging isotope for use in combination with the $\beta$$^-$ emitting therapeutic radionuclide $^{90}$Y (2.7 d), the pair being commonly called as a matched theranostic pair [1]. To produce the radionuclide $^{86}$Y via the $^{86}$Sr(p,n) reaction in a pure form, 96.4% enriched thin $^{86}$SrCO$_3$ targets were...
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Anabella Tudora25/07/2022, 09:54
The influence of fragment distributions (experimental or theoretical) on the prompt emission results deserves a special investigation, as a part of methods and procedures used for the validation of fission fragment distributions. Such investigations are based on the primary model results (which consist of matrices of different prompt emission quantities as a function of fragment A, Z and its...
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Sam Bennett, The n_TOF Collaboration25/07/2022, 09:54
The $^{35}$Cl radiative capture rate is important in a number of applications. The long-lived radionuclide $^{36}$Cl is a by-product of the activation of $^{35}$Cl present in graphite moderated reactors both in the fuel cladding and as an impurity in nuclear graphite (< 2 ppm by mass). Reliable predictions of the amount of $^{36}$Cl present in the large volume of irradiated nuclear graphite...
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Abdelaziz Chebboubi (CEA)25/07/2022, 09:54
A. Chebboubi1, D. Bernard1, V. Vallet1, G. Kessedjian1, O. Méplan2, Y.H. Kim3, U. Köster3, Ch.E. Düllmann4,5,6, F. Géhin1, M. Houdouin-Quenault1,2, O. Litaize1, C. Mokry4,6, M. Ramdhane2, J. Runke4,5 ,C. Sage3, O....
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Isaac Hobday25/07/2022, 09:54
Quantum computing opens up new possibilities for the simulation of many-body nuclear systems.
As the number of particles in a many-body system increases, the size of the associated Hamiltonian increases exponentially. This presents a challenge when performing calculations on large systems when using classical computing methods. By using a quantum computer, one may be able to overcome this...
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Chikako Ishizuka25/07/2022, 10:06
Nuclear fission is expected to play an essential role in the r-process nucleosynthesis via the fission recycling process. However, the impact of the fission recycling process on the r-process is still unclear due to the ambiguity of the fission yields for nuclei far from the beta-stability line and superheavy nuclei.
Our four-dimensional Langevin model can reproduce experimental nuclear...
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Yasushi Nauchi (Central Research Institute of Electric Power Industry)25/07/2022, 10:06
For safe use of nuclear reactor core, slowing down of neutrons and reaction rates inside the core should be predicted accurately. They have made tremendous efforts to improve the calculation methods and the nuclear data for the prediction. However, the calculated neutron spectrum and the reaction rates have been validated only by post irradiation measurement of gamma rays. As an in-situ...
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Bret Beck (LLNL)25/07/2022, 10:06
Transport codes used to simulate reactors, critical assemblies, medical diagnostics, etc. need access to nuclear and atomic data (e.g., data from ENDF/B-VIII.0 and EPICS2017). The Generalized Nuclear Data Structure (GNDS) supports storing evaluated and processed nuclear and atomic data - processed data are data in a form more suitable for transport codes (e.g., cross sections reconstructed...
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Amber Lauer-Coles25/07/2022, 10:06
The National Nuclear Data Center (NNDC) maintains a repository of physical and theoretical quantities in the Evaluated Nuclear Data Format/B library (ENDF/B), currently on the 8th release (ENDF/B-VIII.0). Many fields rely on the accuracy of these quantities and their uncertainties, from real world applications (such as nuclear power) to more theoretical ones. This work is part of a larger...
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Dr Mario Mastromarco (INFN and UniBa, Bari, Italy), and the n_TOF Collaboration25/07/2022, 10:06
- Istituto Nazionale di Fisica Nucleare, Sez. di Bari, Bari, Italy
- Università degli studi di Bari, Dipartimento Interateneo di Fisica, Bari, Italy
- Istituto Nazionale di Fisica Nucleare, Sez. di Perugia, Perugia, Italy
- Istituto Nazionale di Astrofisica, Osservatorio Astronomico d’Abbruzzo, Teramo, Italy
- Istituto Nazionale di Fisica Nucleare, Sez. di Bologna, Bologna, Italy
6....
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Jorge Lerendegui, The n_TOF Collaboration25/07/2022, 10:06
Neutron capture cross-section measurements are of great interest for various nuclear data applications, such as the slow neutron capture (s-) process of nucleosynthesis in stars, innovative nuclear technology or medical applications. The neutron energy range of interest varies depending on the application and, hence, pulsed white neutron sources combined with the time-of-flight (TOF) technique...
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Noah Walton (University of Tennessee)25/07/2022, 10:18
Nuclear data evaluation is a process that takes a long time partly due to resonance identification having to be performed manually by expert nuclear data evaluators. This procedure is laborious, time-consuming, and irreproducible from evaluator to evaluator. Additionally, it is well-documented that a systematic evaluation of the uncertainty on the evaluated cross section is unreliably low....
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Dr Cédric Jouanne (CEA Saclay)25/07/2022, 10:18
GALILEE-1 is the new verification and processing system for evaluated data, developed at CEA.
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We have already presented in the past the reconstruction and Doppler broadening of cross-sections implemented in the GTREND module of GALILEE-1. The results obtained are of very good quality and we can explain the discrepancies observed with respect to other processing codes such as NJOY and PREPRO.... -
Kazuki Okada25/07/2022, 10:18
Fission plays an important role in the study of nuclear data in the actinide region. The dynamical approach to fission using the multi-dimensional Langevin equation has been widely accepted as a practical method. In this approach, nuclear shapes are expressed with a few shape parameters and the fission process is described as their time evolution by the Langevin equation. The shape parameters...
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84. Measurement of 233U-HU Substitution Reactivity Worth in KUCA for Validation of 233U Nuclear DataProf. Tadafumi Sano (Kindai University)25/07/2022, 10:18
As engineering discussions of the feasibility of new reactor systems, it is necessary to evaluate the impact of the fuels and materials for the neutronics characteristics such as criticality, conversion rate, and fuel balance. It is important to perform the validation of 233Th and 233U nuclear data for a thorium-based nuclear reactor, because those nuclear data contribute...
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Mr Francisco García-Infantes (Universidad de Granada, Granada, Spain; European Organization for Nuclear Research (CERN), Geneva, Switzerland)25/07/2022, 10:18
Nuclear medicine has proven to be a much needed medical specialty in order to diagnose and treat several diseases, among them, cardiovascular diseases and cancer, the first and the second causes of mortality worldwide, respectively [1]. Several international agencies recommend to study of new routes and new facilities for producing radioisotopes with application to nuclear medicine as a...
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Jose I. Robledo25/07/2022, 10:30
Nowadays, in neutron time of flight measurements, there are experimental setups in which many detectors record data during a single experiment. It is usually desirable to be able to sum several spectra in order to increase counting statistics, and therefore decrease uncertainties, for further analysis. A problem arises in time-of-flight experiments when the available spectra are acquired with...
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Jun-ichi Hori (Kyoto University)25/07/2022, 10:30
As engineering discussions of the feasibility of new reactor systems, it is necessary to evaluate the impact of the fuels and materials for the neutronics characteristics such as criticality, conversion rate, and fuel balance. It is important to perform the validation of 232Th and 233U nuclear data for a thorium-based nuclear reactor, because those nuclear data contribute...
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Wim Haeck (LANL)25/07/2022, 10:30
Each release of the ENDF/B nuclear data library [1] pushes the limits of the processing codes through the introduction of new data and new data formats. Processing codes must be adapted to ensure that they are capable of using these new formats, or at the very least understand them. NJOY [2], the nuclear data processing code developed at Los Alamos National Laboratory is no exception to this....
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Jingde Chen, Satoshia Chiba25/07/2022, 10:30
We present our first results for a microscopic simulation of symmetric boost fission in terms of the antisymmetrized molecular dynamics (AMD), which incorporates the mean-field effects (as the TDDFT) via SLy4 effective interaction as well as stochastic 2-nucleon collisions similar to the cascade model. Due to these features, AMD is capable of obtaining not only the “expectation value” or...
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Ionel Stetcu25/07/2022, 10:42
Fission fragment properties are set, to a large extent, during the scission process. It is generally assumed that the fully accelerated fission fragments can be treated as compound nuclei, and their de-excitation towards a long-lived state via prompt neutron and gamma emissions can be treated within a statistical model like the Hauser-Feshbach approach to nuclear reactions. Accurate modeling...
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Vivek Agarwal25/07/2022, 10:42
Over the years, the nuclear fleet has relied on labor-intensive, time-consuming preventive maintenance (PM) programs, driving up operation and maintenance (O&M) costs to achieve high capacity factors. The primary objective of the research presented in this paper is to develop scalable technologies deployable across plant assets and the nuclear fleet in order to achieve risk-informed predictive...
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Dr Tiejun Zu (Xi'an Jiaotong University)25/07/2022, 10:42
In the previous version of nuclear data processing code NECP-Atlas reported in the last ND-2019, the code could process the evaluated nuclear data into application libraries of typical formats with the conventional processing methods. NECP-Atlas is under continuous development and verification during the past years. Several new capabilities have been developed in the code.
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(1) The code is... -
Gustavo Alcalá (Instituto de Física Corpuscular, CSIC-Univ. de Valencia, E-46071 Valencia, Spain.)25/07/2022, 11:45
Nuclear reactors are copious sources of antineutrinos. This is the main reason why reactors have played a key role in the discovery of the neutrino and in the study of neutrino oscillation phenomena. The comparison of the neutrino flux measurements performed at short baselines with the improved conversion procedure by Huber [1] and Mueller [2] led to the discovery of the so-called reactor...
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Jorgen Randrup25/07/2022, 11:45
The origin and character of the fission fragment angular momenta are currently topics of intense theoretical study. We describe how the angular-momentum bearing modes of the evolving dinuclear complex are being agitated at different rates by multiple transfers of individual nucleons, the mechanism long understood to be the primary cause of the transport phenomena displayed by damped nuclear...
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Mark Chadwick25/07/2022, 11:45
Nuclear physics advances in the United States and Britain from 1939 to 1945 are described. The Manhattan Project’s work led to a rapid advance in our knowledge of nuclear science. A conference in April 1943 at Los Alamos provided a simple formula used to compute critical masses and laid out the research program needed to determine the key nuclear constants. In short order, four university...
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Roberto Zarrella (University of Bologna - INFN Bologna)25/07/2022, 11:45
FOOT (FragmentatiOn Of Target) is an applied nuclear physics experiment with the aim of performing high precision cross section measurements for fragmentation reactions of interest in Hadrontherapy and Radioprotection in Space. An in-depth knowledge of the physical and biological effects caused by nuclear fragments is in fact of great interest for both the improvement of Hadrontherapy...
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Mario Veicht (Paul Scherrer Institut (PSI); École polytechnique fédérale de Lausanne (EPFL))25/07/2022, 11:45
$^{32}$Si is an extremely rare, naturally occurring radioactive isotope. With its half-life ($\textit{T}$$_{1/2}$) of approximately 150 years $^{32}$Si would be one of the suitable candidates for radiometric dating in the range of 100–1000 years, where an appropriate dating nuclide is still missing (Fig. 1a).
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The fact that the application of this nuclide for dating has been very limited so far... -
Denise Neudecker25/07/2022, 11:45
LA-UR-21-29134
It is a well-known fact that our current nuclear data libraries, among them ENDF/B-VIII.0 [1] in the US, are home to compensating errors that lurk in unconstrained physics spaces [2]. Unconstrained physics spaces arise, on the one hand, due to differential information (from theory and experiments) that is too imprecise to fully describe nuclear data. One the other, this is...
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Michael Rising25/07/2022, 12:09
The development of a new fixed-source sensitivity tally capability, targeted toward nuclear data parameters, is currently underway in the MCNP code. In recent research and development efforts that utilize machine learning to both seek problematic nuclear data as well as design experiments optimized to improve the nuclear data, the adjoint-weighted k-eigenvalue sensitivity tally capabilities...
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Zhizhou Ren25/07/2022, 12:09
Neutron-induced fission cross section of 232Th has important applications in the Th/U fuel cycle. A measurement of the 232Th/235U fission cross section ratios in 1-20 MeV energy region was carried out by the time-of-flight method and Fast Ionization Chamber Spectrometer for Fission Cross Section Measurement (FIXM) at the China Spallation Neutron Source (CSNS)- Back-n white neutron source...
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Maria Teresa Rodriguez Gonzalez (University of Sevilla)25/07/2022, 12:09
In proton therapy, Positron Emission Tomography (PET) range verification, which is based on the detection of the short-lived (online monitoring) or the long-lived (offline monitoring) $\beta^{+}$ emitters produced in the body of the patient, has been proved to be a well-suited technique to monitor the beam range $^{[1]}$. This technique requires the comparison of the observed activity...
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Marc Verriere25/07/2022, 12:09
Nuclear fission is the fundamental mechanism that determines energy production in nuclear power plants. Predictive fission models are necessary for national security applications and are also key to explain the relative abundances of the elements in the universe. In the first part of this talk, we present a novel approach based on particle-number restoration techniques in the fission fragments...
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A Algora (1) Instituto de Física Corpuscular, CSIC-Univ. de Valencia, E-46071 Valencia, Spain)25/07/2022, 12:09
A. Algora1,2, V. Guadilla3, J. L. Tain1, M. Fallot4, M. Estienne4, A. Porta4, L. Giot4, L. Le Meur4, A. Beloeuvre et al. for the DTAS Jyvaskyla Collaboration
1)Instituto de Física Corpuscular, CSIC-Univ. de Valencia, E-46071 Valencia, Spain
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2)Institute of Nuclear Research (ATOMKI), P.O. Box 51, H-4001 Debrecen, Hungary
3)Faculty of Physics, University of Warsaw, 02-093, Warsaw,... -
Isabel Hernandez25/07/2022, 12:09
Authors:
Isabel Hernandez, Jennifer Jo Ressler, Bonnie CanionUnderstanding gamma-ray production in a neutron environment is vital in many scientific concentrations. Emergency response, planetary exploration, safety and shielding designs – among many other applications – depend on analyzing neutron induced gamma-ray spectra from measurements. These research areas often require simulation...
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Kent Parsons (Los Alamos National Laboratory)25/07/2022, 12:21
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Stefano Marin25/07/2022, 12:21
Following the binary fission process, the two energetic fission fragments radiate their energy and angular momenta in the form of neutron and gamma-ray emission. These electrically neutral particles represent important signatures of fission in non-destructive assay of nuclear material and an analysis of the emitted radiation can be used to characterize the fissioning source. The emission of...
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Carlos Paradela (European Commission, Joint Research Centre (JRC))25/07/2022, 12:21
Criticality safety analysis is needed at various stages of the nuclear fuel cycle, including the back-end of the fuel cycle, i.e. reprocessing, transport, storage and final disposal of spent nuclear fuel (SNF). In the past, criticality safety assessments for SNF management for out-of-reactor applications assumed that the fuel is in its most reactive condition, which is usually prior to...
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Victor Valladolid Onecha (Universidad Complutense de Madrid)25/07/2022, 12:21
Although protontherapy is advantageous over more traditional radiotherapy from the point of view of dose delivery and sparing of organs at risk, its full potential has not been reached yet [1]. A lot of effort is focused on proton range verification techniques to improve dose localization. Several of these techniques profit from the secondary emission induced by protons to identify the proton...
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Peter Brain (RPI)25/07/2022, 12:21
{Evaluated nuclear data files are the basis for representing radiation interactions with nuclei in most modern transport and diffusion codes. It is therefore important to verify and update isotopic evaluations periodically to ensure they incorporate up-to-date experimental data and reaction theory in the hope to accurately model systems with low uncertainty. Recently, great interest has been...
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Michael Bacak25/07/2022, 12:21
The 233U nucleus plays a key role as the fissile isotope in the Th-U fuel cycle. Consequently the accurate knowledge of its fission and capture cross sections is essential for a potential reactor design. As highlighted by the NEA High Priority Request List, the 233U(n,g) is of high importance for the production and destruction of 233U and is required to facilitate defining the reprocessing...
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Chris Chapman (Oak Ridge National Laboratory)25/07/2022, 12:33
A resolved resonance region evaluation of 140,142Ce has been carried out by Oak Ridge National Laboratory. Requested by the US Nuclear Criticality Safety Program, this evaluation is based on recent high-resolution transmission and capture high-resolution measurements of natCe and 142Ce conducted at JRC-GEEL at the Geel Linear Accelerator facility, as well as recently measured thermal constants...
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Olivier Serot25/07/2022, 12:33
Despite the numerous theoretical [1] and experimental [2] works published very recently, the way in which fission fragments acquire their angular momentum is still an open question. This angular momentum generation mechanism is important not only for improving our understanding of the fission process, but also for nuclear energy applications, since fission fragments angular momentum strongly...
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Xiaofei Wu25/07/2022, 12:33
The nuclear data are the basic data for reactor burnup calculation. It is significant to study the contribution of their uncertainty to the uncertainty of reactor burnup calculation for improving the safety and economy of reactor. we propagated the uncertainties coming from the nuclear data to the isotopic inventory of sample SF95-4. A Monte Carlo sampling code was developed and used to...
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Dr Toni Kögler (OncoRay – National Center for Radiation Research in Oncology)25/07/2022, 12:33
Particle therapy is a promising and rapidly developing methodology of modern tumor treatment. In order to reach its full potential, however, it requires detailed verification that the clinical target volume receives the planned dose while sparing surrounding healthy tissues.
Although the applicability of in-beam positron emission tomography and prompt gamma rays has already been demonstrated...
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Dr Kenichi Tada (Japan Atomic Energy Agency)25/07/2022, 12:33
The self-shielding effect in the unresolved resonance region has a large impact on the fast- and intermediate-spectrum reactors. The probability table method is widely used for continuous-energy Monte Carlo calculation codes to treat the effect. In this method, a table provides the probability distribution of the cross-section for a nuclide in the given energy grid points. The table is...
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Carole Chatel25/07/2022, 12:33
Improvement in neutronics codes jointly with the advent of high performance computing systems made the calculations more sensitive to the nuclear data. The latter are used both for solving the neutron transport equation together and for nuclear instrumentation validation and operation. Hence, it becomes relevant to improve the knowledge of the fission cross section of fertile secondary...
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Ariel Tarifeno-Saldivia25/07/2022, 12:45
Neutrons are a highly penetrating radiation which can dominate the total adsorbed dose by the human body. Therefore, in different kind of facilities, it is essential to monitor neutron dose rates in order to ensure a minimal risk for workers, patients and public. This task is typically achieved by using commercial portable neutron detectors known as ambient neutron dosimeters. However, there...
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Nicolas Schunck25/07/2022, 12:45
The goal of the FIRE topical collaboration in nuclear theory (2017-2021) was to determine the astrophysical conditions of the rapid neutron capture process (r-process), which is responsible for the formation of heavy elements. This was achieved by including in r-process simulations the most advanced models of fission (spontaneous, neutron-induced, β-delayed) that are beeing developed at LLNL...
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Oscar Cabellos25/07/2022, 12:45
GRE@T-PIONEeR - GRaduate Education Alliance for Teaching the PhysIcs and safety Of NuclEar Reactors - is a new project funded by the Euratom – Horizon 2020 Framework Programme. The project started on November 1st, 2020 for a duration of three years and gathers eight universities throughout Europe.
The project aims at developing and providing specialised and advanced courses in computational...
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Yonghao Chen25/07/2022, 12:45
Neutron-induced fission cross sections of U-235 and U-238 are ones of the most important nuclear data since they are fundamental to nuclear energy. Fission cross sections of U-235 and U-238 have been evaluated as standard data up to 200 MeV and they are always used as references for other cross section measurements. However, the experimental data in high neutron energy region are scarce....
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Jordan McDonnell (UT-Battelle)25/07/2022, 12:45
The neutron induced total, elastic, and capture cross sections of 63,65Cu iso- topes were selected for evaluation in the resolved and unresolved resonance energy ranges by the National Criticality Safety Program to resolve discrepancies related to benchmark performance. This is especially evident for the series of ZEUS benchmarks in which copper is used as a reflector. Because copper is also...
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Ignacio Porras (Universidad de Granada (ES))25/07/2022, 12:57
Boron Neutron Capture Therapy (BNCT) is facing a renaissance with the development of accelerator-based neutron sources in different countries [1,2]. These facilities can be placed in hospitals, overcoming the main barrier in the expansion of this promising therapy, which up to now has been only performed at research reactors. BNCT is the only external radiotherapy option which is selective at...
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Adam Daskalakis25/07/2022, 12:57
Neutron time-of-flight quasi-differential high energy scattering measurements of uranium-238 and natural iron were made at the Rensselaer Polytechnic Institute (RPI) Gaerttner Linear Accelerator Center. Data from the measurements were compared to evaluated nuclear data libraries using MCNP to identify energy-angle discrepancies from 0.5 to 20 MeV, and elastic-to-inelastic scattering ratios...
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Luca Pagani (UC Davis)25/07/2022, 12:57
A measurement of the transmission coefficient for neutrons through a thick ($\sim 3$ atoms/b) liquid natural argon target in the energy range $30$-$70$ keV was performed by the Argon Resonance Transmission Interaction Experiment (ARTIE) using a time of flight neutron beam at Los Alamos National Laboratory.
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In this energy range theory predicts an anti-resonance in the $^{40}$Ar cross section... -
Hiroyuki Koura25/07/2022, 13:09
(1) JAEA nuclear chart
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JAEA has published a paper-based nuclear chart which is a sheet of 12 or 16 pages in A4 size, every four years since 1976. The chart is a two-dimensional chart that shows the number of protons on the vertical axis and the number of neutrons on the horizontal axis in order to represent the properties of various nuclei, and we distribute them to (mainly) researchers on... -
Catherine Romano25/07/2022, 13:21
The Nuclear Data Working Group (NDWG) was established in 2015 to identify cross-cutting nuclear data needs, and to facilitate communication and collaboration across programs on nuclear data activities. The NDWG currently consists of over forty members who represent the needs of program offices across the Department of Energy, the National Nuclear Security Administration, and other programs. ...
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J. Tang (CSNS/CADS/IHEP)26/07/2022, 06:00
The Back-n white neutron source at CSNS (China Spallation Neutron Source) has been in operation since 2018. As a multidisciplinary research platform, Back-n has its main focus on nuclear data measurements. With its unique beamline using the back-streaming neutrons from a proton beam of 100 kW in beam power impinging on a thick spallation target in tungsten, Back-n owns the highest neutron flux...
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Kazuya Shimada26/07/2022, 06:00
The total kinetic energy (TKE) of fission fragments is accounting for about 80 to 90 % of the Q-value in nuclear fission. Therefore, it is important to understand the characteristics of TKE from the perspective of nuclear energy utilization and basic research, e.g., number of fission in reactor power or local heating of the r-process site including fission recycling. Naively thinking, the TKE...
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Victor Babiano-Suarez, n_TOF collaboration26/07/2022, 06:00
The slow neutron capture ($s$-) process is responsible for the formation of half of the elements heavier than iron in the Universe. Despite the long time scale of this process, the long half-life of some isotopes throughout the $s$-process reaction flow creates branching points that lead to the division of the nucleosynthesis path. ${79}$Se ($t_{1/2} = 3.27 \times 10^5$ y [1]) represents one...
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David Brown (NNDC, Brookhaven National Laboratory)26/07/2022, 06:00
The Generalised Nuclear Database Structure is a new standard for representing reaction and decay data in nuclear data libraries and is slated to replace the legacy ENDF-6 format. GNDS is designed to be both human readable and easy to work with so that downstream code developers can create software that supports GNDS. The specifications for GNDS-1.9 were published in 2020; this version...
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Lawrence Heilbronn (University of Tennessee)26/07/2022, 06:00
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Dr Enrique M. González Romero (CIEMAT)26/07/2022, 06:00
The SANDA H2020-EURATOM project, Supplying Accurate Nuclear Data for energy and non-energy Applications, brings together the majority of the European nuclear data community (35 partners from 19 countries), infrastructures and resources to produce accurate and reliable nuclear data tools including data, codes and methodologies that can be used to simulate, analyse, optimize, exploit and...
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Olivier Litaize (CEA)26/07/2022, 06:12
The nuclear de-excitation process (through neutron, gamma and electron emission) simulated by the Monte Carlo code FIFRELIN [1] has been improved recently and compared with results from fission and radiative neutron capture experiments. Several examples will be presented during this conference.
Firstly, the initial goal of the code is to predict fission observables and associated...
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Michael Bacak26/07/2022, 06:24
The European Laboratory for Particle Physics (CERN) is equipped with a top-class, high-brightness, neutron spallation source dedicated to high-resolution neutron time-of-flight experiments: the n_TOF Facility.
During CERN’s Long Shutdown 2 (LS2, 2019-2021), the n_TOF neutron spallation target has been exchanged and the facility is now operating with its third-generation target [1]. The...
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Ana Maria Gomez26/07/2022, 06:24
The particle spectrometer VERDI (VElocity foR Direct particle Identification) allows high-precision measurements of fission fragment (FF) mass distributions by using the 2E-2v technique. VERDI consists of two arms with 16 Silicon PIPS (Passivated Implanted Planar Silicon) detectors and a Micro Channel Plate (MCP) each. The MCPs provide the pick-off signal used to trigger the time-of-flight...
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Matteo Vorabbi (Brookhaven National Laboratory)26/07/2022, 06:24
In the unresolved resonance region (URR), cross sections for neutrons interacting with nuclei have resonances that cannot be measured nor predicted, hence only statistical values are provided. Often, proper simulations by neutronic transport codes require special data and handling in the URR to account for the variation in the cross sections in this region. The current methodology used to...
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Mirco Dietz, the n_TOF Collaboation26/07/2022, 06:24
The slow neutron capture process (s-process) is responsible for producing about half of the elemental abundances heavier than iron in the universe. Neutron capture cross sections on stable isotopes are a key nuclear physics input for s-process studies. The $^{72}\mathrm{Ge}(n,\gamma)$ Maxwellian-Averaged Cross Section (MACS) has an important influence on production of isotopes between Ge and...
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Mr Yinlu Han (中国原子能科学研究院), Yue Zhang (中国原子能科学研究院)26/07/2022, 06:24
Silicon is of great applied interest in the semiconductor industry and in detectors for physics experiments. An increased understanding of neutron induced charged particle producing reactions on silicon is particularly significant not only for basic physics but also for applications.
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In the present work, an optimal set of optical model potential parameters is obtained for the n+28,29,30Si... -
Dr Amanda Lewis (Naval Nuclear Laboratory)26/07/2022, 06:24
The EXFOR database is the major source to retrieve experimental data as input for nuclear data evaluations. It aggregates decades worth of international nuclear data measurements. EXFOR is specifically designed to store experimental data as it was reported by the experimentalists, with limited corrections made as needed. For this reason, the database does not store the subjective alterations...
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Gianpiero Gervino26/07/2022, 06:36
The correct prediction of the abundances of the light nuclides produced during of Big Bang Nucleosynthesis (BBN) is one of the main topics of modern cosmology. In order to precisely determine BBN 6 Li production the cross-section of the nuclear reaction 2H(α, γ)6Li must be directly measured within the astrophysical energy range of 30-400 keV. This measurement requires ultra low gamma-ray...
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Emmeric Dupont (CEA)26/07/2022, 06:36
The n_TOF neutron spallation source at CERN is used since 2001 for high quality nuclear data measurements from sub-thermal energy up to hundreds of MeV for the benefit of various communities in the fields of nuclear physics, nuclear astrophysics and nuclear technology. In the past twenty years, a considerable amount of valuable experimental results has been obtained and published, and...
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Zhihao Gao26/07/2022, 06:36
Independent fission yields in neutron-induced fission at high neutron energy is important for the understanding of the fission process, and it is also in relevant for reactor physics applications. So far, measurements of independent fission yields in proton-induced fission has been performed at the IGISOL facility at the University of Jyväskylä, using the Penning trap as a high...
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Alberto Mengoni26/07/2022, 06:36
The European Laboratory for Particle Physics (CERN) is equipped with a top-class, high-brightness, neutron spallation source dedicated to high-resolution neutron time of flight experiments: the n_TOF Facility.
The Facility has been constructed in 2000 [1] and has evolved significantly over the last 20 years, encompassing the creation of a new vertical experimental area on top of the...
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Dr Robert William Mills (UK National Nuclear Laboratory)26/07/2022, 06:36
The Advanced Fuel Cycle Programme funded by the UK Government through the Department for Business, Energy & Industrial Strategy revolves around developing capability and capacity for nuclear while seeking to reduce costs across the nuclear lifecycle, to ensure that nuclear can play a part in delivering secure, low-carbon energy in the global market. This includes the development of Advanced...
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Francesca Luoni (GSI, TUDa)26/07/2022, 06:36
Monte Carlo simulation tools make use of models to describe the physics of everything that surrounds us. For such tools to be reliable, models as close to reality as possible need to be implemented in the simulation. Nuclear reaction cross-sections play an essential role in simulations for radiation protection in space. Therefore, a GSI-ESA-NASA collaboration project created a collection of...
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13. (WITHDRAWN) Simultaneous measurements of prompt fission γ-rays and neutrons with CLLBC detectorsCristiano Lino Fontana26/07/2022, 06:48
The knowledge about prompt neutrons and $\gamma$-rays spectral characteristics in nuclear fission is essential to understand the nuclear de-excitation process of fission fragments [1,2]. Preferably, these observables should be known in correlation with fragment properties like mass and kinetic energy.
Typical multi-parameter experiments require long measurement times and efficient detector...
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Michael Bacak26/07/2022, 06:48
The n_TOF facility at CERN is a pulsed neutron source for time-of-flight measurements, first conceptualised by Carlo Rubbia in 1998 [1]. It is designed to study neutron induced reactions bearing importance for fundamental research, nuclear astrophysics [2,3], nuclear technology applications [4] as well as nuclear medicine [5]. During its first two operation phases, n_TOF consisted of a single...
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Paraskevi Dimitriou (International Atomic Energy Agency)26/07/2022, 06:48
The availability of reliable, up-to-date and well-structured nuclear data libraries, with user-friendly visualization and retrieval interfaces, is a valuable tool for both nuclear specialists in the applications fields and nuclear physics researchers.
The International Atomic Energy Agency (IAEA) has been coordinating the international network of Nuclear Structure and Decay Data evaluators...
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Prof. Daniel Cebra (University of California, Davis)26/07/2022, 06:48
The damage due to cosmic rays is a serious concern for astronauts, electronics, and spacecraft. Although the cosmic ray flux is comprised mostly of protons and helium nuclei, there is a non-negligible component comprised of heavy-ions up to and including iron nuclei. The importance of the heavy-ion component is enhanced because the damage due to ionization goes as $Z^2$. In addition to the...
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Claudia Montanari26/07/2022, 06:48
Stopping powers are relevant to a wide range of applications, such as ion beam analysis, deposition ranges, ion implantation, and radiation damage, to name a few. Reliable values of stopping powers are also needed in isotope production for medical applications, in fusion technologies and detector development.
In this work we present the state of the art of the stopping power of ions in...
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Roberto Capote (IAEA NDS)26/07/2022, 06:48
New U-235 and U-238 evaluations [1-3] were undertaken within the OECD/NEA Data Bank CIELO Project [4] and were adopted for the ENDF/B-VIII.0 library [5], which was released in 2018. Since then, several reports and publications were released that showed serious discrepancies with the light water reactor (LWR) performance of the previous ENDF/B-VII.1 library [6] in criticality studies as the...
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Dr Aaron Hurst (University of California, Berkeley)26/07/2022, 07:00
Current fieldable spectroscopy techniques often use single detector systems heavily impacted by interferences from intense background radiation fields. These effects result in low-confidence measurements that can lead to misinterpretation of the collected spectrum. To help improve interpretation of the fission products and short-lived radionuclides produced in a composite sample, a...
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Jose Antonio Pavon Rodriguez (University of Seville and CERN)26/07/2022, 07:00
The n_TOF Collaboration operates the neutron time-of-flight facility at CERN [1], based on a 20 GeV/c pulsed proton beam impinging on a lead target employing water to moderate the spallation neutrons. The facility is characterized by a high-instantaneous neutron beam intensity, high energy resolution and a wide neutron energy spectrum, spanning from sub-thermal to GeV. The first experimental...
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Seiya Manabe26/07/2022, 07:00
The main threat to electronics at the ground level is well-known as the secondary-cosmic-ray-induced soft error. The soft error is caused by an upset of the memory information due to an energy deposition by an energetic ionizing radiation. Among the cosmic-ray species, the muon has recently drawn attention as a new cause of the soft error due to the reduction of the critical charge of the...
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Pablo Romojaro (SCK CEN)26/07/2022, 07:00
The Multi-purpose hYbrid Research Reactor for High-tech Applications (MYRRHA) is a flexible experimental facility being designed at SCK CEN, Mol, Belgium. It is conceived to operate both in sub-critical mode, as an Accelerator Driven System, and in critical mode, as a lead-bismuth cooled fast reactor.
In order to comply with MYRRHA reactor design requirements, uncertainties must be...
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Shengli Chen26/07/2022, 07:12
Neutron irradiation damage is a key factor that influences behaviors of nuclear materials. Folding the specific neutron flux to the pre-calculated displacement damage cross section is a widely used method for quantifying neutron irradiation damage in nuclear reactors. This method has been implemented in various neutron transport codes, such as ERANOS and OpenMC. However, because the...
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Benjamin Shu26/07/2022, 07:12
The National Nuclear Data Center (NNDC) provides access to physics research data through a collection of 40 websites. Each is dedicated to a topic, a database, or to a previous conference. Many also have long histories, with the oldest websites having been deployed in 1998. Collectively, these websites receive millions of requests for data, with an estimated 5.2 million retrievals in 2020...
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Prof. Lee Bernstein (LBNL/UCB)26/07/2022, 07:12
The galactic cosmic ray (GCR) background presents creates a hostile, high-dose environment for astronauts and the electronics they rely. While the GCR spectrum extends to 10’s of GeV/nucleon, much of the dose in electronics is attributable to the final slowing of heavy ion at the end of their path, e.g., the “Bragg peak”, and the location and magnitude of the Bragg peak is in turn highly...
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Mrs Elisso Stamati26/07/2022, 07:12
A new experimental area, the NEAR Station, has recently been setup at the n_TOF facility at CERN. It is located at ~3 m distance from the spallation target, just outside the target-moderator shielding wall [1]. The main purpose of the new experimental area is to exploit the extremely high neutron flux in the vicinity of the spallation target to perform irradiation and activation measurements...
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Dr Kim Tuyet Tran (SOKENDAI)26/07/2022, 07:45
Radiation shielding and calculation are essential for the construction and operation of accelerator facilities. High energy gamma-rays in accelerators can produce secondary neutrons, which can penetrate through shielding materials and produce additional dose rate by activating accelerator components; thus, the double differential cross sections (DDXs) of photoneutron are very essential....
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Maria Diakaki (Department of Physics, National Technical University of Athens, Zografou campus, 15780 Athens, Greece), Maria Diakaki (Department of Physics, National Technical University of Athens, Zografou campus, 15780 Athens, Greece)26/07/2022, 07:48
Studies of neutron-induced reactions are of considerable significance, both for their importance to basic research in nuclear physics and for practical applications in nuclear technology, medicine and industry. Thallium is widely used in electronics, pharmaceuticals, fiber optics, infrared detectors and nuclear medicine. However, little information is available in literature for neutron...
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Visakh A C (Central University of Kerala)26/07/2022, 07:51
Nuclear fusion is a complex process involving a complete re-arrangement of quantum systems with many degrees of freedom. Heavy ion fusion exhibits a strong entrance channel dependence at near fusion barrier energies and could be reasonably explained by coupled channels formalism [1,2] that explicitly includes the effects of internal degrees of freedom. Though tremendously successful in...
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Dr Greg Henning (CNRS - IPHC)26/07/2022, 07:54
The production of useful and high-quality nuclear data requires experimental measurements with high precision and extensive information on uncertainties and possible correlations. When performing experimental measurement data analysis, the physicist uses many external parameters (detector efficiencies, distance of flight, …) in addition to the raw data. All the steps of the data processing...
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Greg Henning26/07/2022, 07:57
Most nuclear reactor developments rely on evaluated databases for numerical simulations to optimize and predict performance and reactor control parameters. However, these databases still present large uncertainties, preventing calculations from reaching the required precision. An improvement of evaluated databases requires new measurements and better theoretical descriptions of involved...
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Mario Veicht (Paul Scherrer Institut (PSI); École polytechnique fédérale de Lausanne (EPFL))26/07/2022, 08:00
The artificial production of radionuclides has considerable significance for many different applications. Recently, we observe increasing interest in the field of nuclear medicine, with $^{44g}$Sc being one of the promising nuclides for positron emission tomography. Besides its direct production routes by irradiating suitable targets like Sc or Ti with charged particles, $^{44}$Ti is in the...
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Hanxiong Huang (CIAE)26/07/2022, 08:03
The metal gallium is a very interesting element on earth. It is a liquid at temperatures greater than 29.76 °C and has a very high boiling point (2229 ◦C). Gallium has widely been used to make alloys with low melting points and has become a candidate element in Chinese Initiative Accelerator Driven Systems (CIADS) project for liquid–metallic coolant [ ]. The neutron cross section of gallium is...
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Toshiya Sanami (KEK/SOKENDAI)26/07/2022, 08:06
Experimental data on photoneutron spectrum for reaction of 16.6MeV mono-energetic polalized photons on medium-heavy mass targets were obtained at BL-01, NewSUBARU, Hyogo, Japan. The data consists of low energy neutrons having energy distribution similar to tail of Maxwellain and relatively high energy ones originated from decay of pre-equilibrium status. In this presentation, quantities...
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Mr Martin Ansorge (Nuclear Physics Institute of the Czech Academy of Sciences)26/07/2022, 08:09
The new detection device for measurements of light ions (p, d, t, α) emitted as products of the
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nuclear reactions induced by fast neutrons was recently developed at the Nuclear Physics Institute of
the Czech Academy of Sciences. The device consists of the vacuum chamber and rotational table with
the detection telescopes composed of two Si detectors for dE–E charged particle recognition. It is... -
Andreas Oberstedt (Extreme Light Infrastructure - Nuclear Physics)26/07/2022, 08:12
Prompt fission $\gamma$ rays (PFG) account for 40% of the total $\gamma$ heating in the core of a typical fast reactor, which in turn constitutes about 10% of the total energy release in fission [1]. Therefore, precise knowledge about multiplicities and $\gamma$-ray energies is important. Prompt fission $\gamma$ rays are commonly defined as those emitted in coincidence with fission fragments,...
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Anabella Tudora (University of Bucharest)26/07/2022, 08:15
The prediction of prompt neutron spectra of the photon-induced reactions on the 238U and 232Th targets are needed in the treatment of experimental data of the reactions induced by quasi monochromatic γ-ray beams produced in laser Compton-scattering at the NewSUBARU synchrotron radiation facility.
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Unfortunately any experimental information concerning both the fission fragments and the prompt... -
Yuan Tian (China Institute of Atomic Energy)26/07/2022, 08:18
We have added the multipole humped fission barriers model into the Unified Hauser-Feshbach and Exciton Model for Fission Nuclei (FUNF). With the help of the MINUIT, we optimized the parameters of FUNF to reproduce the cross-section of neutron-induced $^{238}U$. The double-humped fission barrier can be used to explain the low energy resonance structure of $n+^{238}U$ fission cross-section at low energy.
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Mr Kazuki Okada (Department of Pure and Applied Physics, Kansai University)26/07/2022, 08:21
The Langevin approach has been widely used in the study of fission. In this approach, the fission process is described as the time evolution of the shape deformation of the nucleus, and the fragment mass and kinetic energy distributions can be calculated. The physical inputs for the Langevin equation are the potential energy of deformation and two transport coefficients: the inertia and the...
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Trevor Sprouse (Los Alamos National Laboratory)26/07/2022, 08:23
A robust description of the process of nuclear fission is essential to many research domains ranging from nuclear energy, national security, and nuclear data. However, owing to the nuclear many-body problem, a description of fission based on nucleon-nucleon interactions is unfeasible given current computational limitations, which has led to a number of alternative methods that greatly reduce...
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Yinlu Han (China Institute of Atomic Energy)26/07/2022, 08:25
Abstract
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In order to reduce the uncertainties in the design and operation of accelerator-driven systems (ADSs), high-precision nuclear data for neutron- and proton-induced reactions on a variety of isotopes in the energy range below 200 MeV are necessary. As the important component of the spent fuel of current nuclear power plants, U isotopes will be loaded into ADSs to produce energy and... -
Vaibhav Jaiswal (Institut de Radioprotection et de Sûreté Nucléaire (IRSN))26/07/2022, 08:27
Improving the prediction of TSL on-the-fly based on deep neural networks using experimentally measured double differential data and dynamic structure factor
Vaibhav Jaiswal$^{1,*}$, Arthur Pignet$^2$, and Luiz Leal$^1$
$^1$Insititut de Radioprotection et de Sûreté Nucléaire (IRSN), Fontenay-aux-Roses, France
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$^2$MINES ParisTech, PSL - Research University, Centre for Material Forming... -
Jounghwa Lee26/07/2022, 08:29
Fission fragments are highly excited after scission, and they de-excite by the emission of neutrons and the subsequent gamma emission. The products before and after the emission of neutrons and gammas are called pre- and post-neutron fission fragments, respectively. Pre- and post-neutron emission fission product yields (FPY) can be related through the emitted neutrons, i.e. neutron...
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Douglas Di Julio (European Spallation Source ERIC)26/07/2022, 08:31
Reflectors play an important role at reactor and spallation neutron sources, providing a means for otherwise lost neutrons to be potentially re-directed towards the neutron science instruments. Such materials typically surround the moderating volume, but can also be placed in the neutron beam extraction area. We present developments of improved modelling methods such as including crystallite...
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Mr Benjamin Wang (RPI)26/07/2022, 08:33
Validation of the accuracy of S(α,𝛽) thermal scattering law (TSL) evaluations for moderator materials is an important task for the development of high-performance nuclear engineering systems. Many recent thermal neutron scattering evaluations have had limited experimental validation. Like other nuclear data, validation of TSL libraries has historically been by integral criticality...
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Mr Benjamin K. Laramee (North Carolina State University)26/07/2022, 08:35
Metal hydrides have a variety of mechanical, thermal, and neutronic properties that are ideal for applications to nuclear technologies. As a result, zirconium hydride has been used in the fuel of TRIGA reactors for over half a century. More recently, calcium hydride (CaH${}_{2}$), a saline hydride, has been investigated and shows promise for use as a moderator in microreactors. As of yet,...
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Marek Zmeškal (Research Centre Řež s.r.o.)26/07/2022, 08:36
The medical cyclotrons intended to produce medical isotopes are relatively widespread. Nowadays, it is popular to place small and compact accelerators directly to hospitals. This approach simplifies handling with produced radiopharmaceuticals, but it imposes radiation safety measures during production. Radiation protection issues are gaining on importance especially as production increases on...
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Aaron Tamashiro (Oregon State University)26/07/2022, 08:37
Fission product yields play an important role for nuclear reactor fuel cycle, nuclear reactor
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decay heat, and nuclear reactor waste inventory. Multiple techniques have been used to determine
fission product yields for many decades to support reactor design. For our purposes, we will be
performing $\gamma$-ray spectroscopy on $\beta$-decaying fission products following a prompt fission... -
Paul Koehler (LANL)26/07/2022, 09:30
P. E. Koehler1, A. Stamatopoulos1, E. Bond2, T. A. Bredeweg2, A. Couture1, B. DiGiovine1, M. E. Fassbender2, A. C. Hayes-Sterbenz3, G. Keksis2, A. Matyskin2, K. Parsons4, G. Rusev2, J. Ullmann1, C. Vermeulen2
- Physics division, Los Alamos National Laboratory, 87545, NM, USA
- Chemistry division, Los Alamos National Laboratory, 87545, NM, USA
- Theory Division, Los Alamos National...
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Maelle Kerveno26/07/2022, 09:30
GRAPhEME is a $\gamma$ spectrometer developed by CNRS/IPHC Strasbourg (France), in collaboration with EC-JRC/Geel (Belgium) and IFIN-HH Bucharest (Romania). With its 6 High Purity Planar Germanium detectors, GRAPhEME, installed at the EC-JRC GELINA facility, was optimized for measurements of accurate (n,xn $\gamma$) cross sections on actinides. The experimental methodology is based on prompt...
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Nadine Mariel Chiera26/07/2022, 09:30
Radioisotopes with half-lives (t$_{1/2}$) in the order of millions of years play an essential role in the description of galactic events, as well as in the nuclear dating of extraterrestrial samples. Among the different benchmark radionuclides for astrophysics and geophysics studies, the radio-lanthanides $^{146}$Sm, $^{148}$Gd and $^{154}$Dy are of especial interest. In fact, through the pure...
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Matthew Mumpower (Los Alamos National Laboratory)26/07/2022, 09:30
Nuclear data is critical for many modern applications from stockpile stewardship to cutting edge scientific research. Central to these pursuits is a robust pipeline for nuclear modeling as well as data assimilation and dissemination. We summarize the ongoing nuclear data efforts at Los Alamos for medium mass to heavy nuclei. We begin with a discussion of a novel toolkit for model parameter...
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Dr Danila Roubtsov (Canadian Nuclear Laboratories (CNL))26/07/2022, 09:30
Among the photo-nuclear reactions of light nuclides, the photo-disintegration of deuterium, $^2{\mathrm H}(\gamma,{\mathrm n})^1{\mathrm H}$, is arguably the most important one for nuclear systems with heavy/light water. In multiplying/critical systems, this reaction is also a source of delayed neutrons due to the delayed gamma emission of certain fission products. Therefore, it is important...
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Walter Loveland26/07/2022, 09:30
The study of the fast neutron (En = 3-100 MeV) induced fission of actinide nuclei allows us to study the relative role of Coulomb and dissipative forces in a large scale nuclear collective motion. One is aware of the practical applications of knowing the energy release and its dependence on neutron energy and fragment mass. We have been engaged in studies of the total kinetic energy release...
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Matthew Devlin26/07/2022, 09:42
The Chi-Nu project at the Los Alamos Neutron Science Center (LANSCE) continues to measure Prompt Fission Neutron Spectra (PFNS) as accurately and completely as possible, with fully understood uncertainties including uncertainty correlations. These measurements use the LANSCE/WNR white-spectrum neutron beam and cover incident neutron energies from below 1 MeV to 20 MeV, and were originally...
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Valentina Semkova26/07/2022, 09:54
Neutron-induced reaction cross-sections on hafnium isotopes are important for research and nuclear applications. Hafnium is considered as a constituent of the control elements and structural materials of nuclear reactors due to its high absorption cross-section for thermal neutrons, good mechanical properties and extremely high resistance to corrosion. Hafnium is an alloying element of low...
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Ronald Malone26/07/2022, 09:54
Fission product yields (FPY) are an important observable for fundamental and applied nuclear physics. We are conducting a comprehensive study of the cumulative FPY from neutron-induced fission of $^{235}$U, $^{238}$U, and $^{239}$Pu between 0.5 and 15 MeV at the Triangle Universities Nuclear Laboratory. Actinide foils are irradiated using monoenergetic neutron beams produced by a tandem...
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Dr Rugard Dressler (Paul Scherrer Institute)26/07/2022, 09:54
Short-lived radionuclides, i.e., radioactive isotopes with half-lives less than 100 Ma, were present in the proto-solar cloud and during the early phases of the formation of our Solar system. The origin of individual short-lived radionuclides is still under debate. Due to the comparatively short half-lives, these isotopes are nowadays not present in cosmic samples, but are recognizable as...
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Katelyn Cook (Rensselaer Polytechnic Institute)26/07/2022, 09:54
Accurate gamma production in capture reactions is critical for simulation of nuclear reactor applications. This includes modeling of strength functions and level densities and calculating cross sections from resonance parameters. To improve this work, the Rensselaer Polytechnic Institute (RPI) 16-segment gamma-multiplicity NaI(Tl) detector at the Gaerttner Linear Accelerator Center (LINAC) has...
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Luiz Leal (IRSN)26/07/2022, 09:54
Recent experimental data measurements, namely transmission and (n, alpha), have motivated revising the O16 resonance region evaluation. Issues with the normalization of the (n, alpha) cross sections have been investigated and a very dependable measurement has been carried out at the GELINA facility at the Joint Research Center Geel from the energy threshold (2.354 MeV) to 9 MeV. Additionally,...
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David Brown26/07/2022, 09:54
In May 2021, the National Nuclear Data Center (NNDC) was designated by the US Department of Energy Office of Science (SC) as a Public Reusable Research (PuRe) Data Resource. The DOE defines "PuRe Data Resources are data repositories, knowledge bases, analysis platforms, and other activities that make data publicly available to enable better communication, better stewardship, and better...
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Nikolay Sosnin (University of Edinburgh)26/07/2022, 10:06
Around half of the elements heavier than iron are produced via the slow neutron capture process ($s$-process), whereby a seed nucleus undergoes a series of neutron captures and beta decays, with the timescales of the captures being slower than those of beta decays. The $s$-process is further subdivided into several different components which occur in different types of stars. Of particular...
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Ms Maria de los Ángeles Millán Callado (Centro Nacional de Aceleradores (CNA, CSIC-US-Junta de Andalucía) - Dpto. Física Atómica, Molecular y Nuclear (FAMN), Universidad de Sevilla (US))26/07/2022, 10:06
Centro Nacional de Aceleradores (CNA) is a joint interdisciplinary research center from Universidad de Sevilla, Junta de Andalucía and CSIC (Spanish National Research Council) open to external users. CNA has six different facilities, namely: a 3 MV Pelletron tandem accelerator, an 18/9 MeV Cyclotron accelerator, a 1 MV mass spectrometer accelerator, a PET/CT scanner, a 200 kV radiocarbon...
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Rosa Vlastou26/07/2022, 10:06
Neutron induced reactions can provide significant information in the field of nuclear physics and applications. Hafnium (Hf) is one of the rare-earth isotopes with a relative large total neutron cross-section in the thermal neutron energy region and neutron induced reactions in reactor materials could lead to the production of long-lived isomeric states of Hf isotopes. Thus, the knowledge of...
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Nicolas Dari Bako (IPHC/CNRS)26/07/2022, 10:06
For the improvement of Generation IV nuclear reactors simulation, accurate evaluated data are required. Among others, a reaction of interest is the neutron inelastic scattering as it modifies the energy distribution of neutrons. In the context of the innovated Th/U cycle and for a better knowledge of the neutron inelastic scattering on thorium 232, experiments have been performed at...
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Panagiotis Gastis26/07/2022, 10:06
Independent fission product yields (FPY), i.e., yields of fission products right after the prompt neutron emission, but before beta decay, are an important piece of data for nuclear fission modeling and fission applications. The Spectrometer for Ion Determination in fission Research (SPIDER), was developed at Los Alamos Neutron Science Center (LANSCE) for measuring FPYs from neutron-induced...
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Dorothea Wiarda (ORNL)26/07/2022, 10:06
The R-Matrix code SAMMY \cite{SAMMY} is a widely used nuclear data evaluation code focused on the resolved range,
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which includes corections for experimental effects. The code is still mostly written in Fortran 77, and uses
a memory managment system suitable for the time of its initial writing (1984). A modernization effort is under way
to bring the code in-line with modern software... -
Dr Marco Pigni (ORNL)26/07/2022, 10:18
The evaluation of $^{239}$Pu neutron resonance parameters coupled to neutron multiplicities $\bar{\nu}_{p}$ is of particular importance to investigate the $(n,\gamma f)$ reaction in which a $\gamma$-ray emission occurs before the scission of the compound nuclear. This reaction has offered one explanation for the fluctuations in the measured values of $\bar{\nu}_{p}$. In this regard, the...
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Josh Brown (UC Berkeley)26/07/2022, 10:18
The Gamma Energy Neutron Energy Spectrometer for Inelastic Scattering (GENESIS) was commissioned at the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory (LBNL). The array consists of up to 27 EJ-309 organic scintillators capable of $n-\gamma$ particle discrimination. The $\gamma$-ray detectors include two Compton-suppressed 4-fold segmented Eurosys CLOVER HPGe detectors, several...
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Simone Amaducci (Laboratori Nazionali del Sud (IT))26/07/2022, 10:18
It is well ascertained since the late '50, that the vast majority of the elements above the iron peak are synthesized in stars, via sequences of neutron captures and β-decays. Among the nucleosynthesis mechanisms, the slow (s-)process represents one of the better known and is very effective into modelling the stellar evolution. Thanks to the high accuracy of the nuclear data available in the...
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Mrs Valentina Fabrizio26/07/2022, 10:18
The increasing interest worldwide in Lead-cooled Fast Reactors (LFRs) substantiates the need to validate the analytical codes and methods used to support their design. For neutronic analyses, this is chiefly reflected in assessing the impact of nuclear data uncertainties on the integral and local parameters resulting from such analyses. Besides this driving interest, the aim of refining...
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Amy Lovell26/07/2022, 10:18
The Hauser-Feshbach fission fragment decay model HF$^3$D calculates the statistical decay of fission fragments through both prompt and delayed neutron and $\gamma$-ray emissions in a deterministic manner. While previously limited to the calculation of only first-chance fission, the model has recently been extended to include multi-chance fission, up to neutron incident energies of 20 MeV. ...
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Roland Beyer26/07/2022, 10:18
Significant shortcomings in the resolved resonance region of all existing evaluations of iron isotopes have been identified from leakage neutron measurements to be related to inaccurate elastic cross sections minima between 50 and 700 keV [1,2]. Those regions are only sensitive to highly accurate transmission measurements through very thick samples. The overestimation of the measured yield in...
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Dr Alvaro Tolosa-Delgado (University of Jyvaskyla, Finland), BRIKEN collaboration BRIKEN collaboration (BRIKEN collaboration)26/07/2022, 10:30
How elements are made in the Universe is an open long-standing question. Several processes are invoked to explain the observed elemental abundances in our Solar System [1] and in our Galaxy [2].
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Complex simulations of astrophysical events are used to study the origin of the heavy elements and quantify the contribution of the r-process to the observed elemental abundances [3]. This process... -
Brian Epping26/07/2022, 10:30
A new experiment configuration was designed, developed and implemented to measure photoneutron yields using the Rensselaer Polytechnic Institute (RPI) electron linear accelerator (LINAC) at the RPI Gaerttner LINAC Center. The new experiment configuration includes a new target assembly that converts the LINAC electron beam into a high energy bremsstrahlung photon flux incident upon a sample...
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Dr Naohiko Otsuka (International Atomic Energy Agency), Dr Osamu Iwamoto (Japan Atomic Energy Agency)26/07/2022, 10:30
The fast neutron fission cross sections of 233,235,238U and 239,240,241Pu were evaluated for the JENDL-5 library up to 200 MeV. The experimental fission cross sections and their ratios in the EXFOR library were reviewed with the source articles. Additionally, Poenitz’s data compiled in his GMA database were reviewed. We found about 160 datasets are archived with the...
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Thanos Stamatopoulos (Los Alamos National Laboratory)26/07/2022, 10:30
The new Device for Indirect Capture Experiments on Radionuclides at LANSCE: Efforts on measuring the resonance(s) responsible for the extremely large 88Zr(n,g) cross section
A. Stamatopoulos1, P. Koehler1, E. Bond2, T. A. Bredeweg2, A. Couture1, B. DiGiovine1, M. E. Fassbender2, A. C. Hayes-Sterbenz3, G. Keksis2, A. Matyskin2, K. Parsons4, G. Rusev2, J. Ullmann1, C. Vermeulen2
- Physics...
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Yongli Xu26/07/2022, 10:42
In order to reduce the uncertainties in the design and operation of accelerator-driven systems (ADSs), high-precision nuclear data for neutron- and proton-induced reactions on a variety of isotopes in the energy range below 200 MeV are necessary. Knowledge of accurate neutron-induced fission cross sections is crucially important for the design of various reactor systems. Therefore, accurate...
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Dominik Fritz26/07/2022, 10:42
Recently, a cold moderator was designed and developed for use at the RPI LINAC. This cold moderator proved to easily and safely couple to an existing neutron producing target, while enhancing neutron flux below 0.02 eV by cooling polyethylene down to 29 K. This cold moderator capability allowed for significantly improved counting statistics below 0.02 eV not previously possible due to a poor...
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Pierre Leconte26/07/2022, 10:54
Delayed neutron data is essential in inherent reactor safety and in reactor control since it is used to estimate the reactivity. The quantities of interest related to delayed neutrons are the average delayed neutron yield, and the group constants that define the kinetics of delayed neutron emission.
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Discrepancies among the evaluated data as well as missing covariance in most of international... -
Ian Thompson26/07/2022, 11:15
Charged-particle-induced reactions at low energies in the resolved resonance region are important for a range of applications in basic and applied sciences. Ion Beam Analysis of materials for cultural heritage, environment and climate control, and forensics, depends on the knowledge of proton-, deuteron- and alpha-induced reactions at energies of a few MeV. Management of fuel in nuclear...
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Anton Wallner26/07/2022, 11:15
The recommended cross-section value for $^{235}$U neutron-capture at thermal energies is largely based on the difference from total and competing cross-sections of $^{235}$U. Despite its importance as a thermal neutron constant and its high value (100 barn), direct capture measurements are rare (only two exist for thermal energies) and exhibit large uncertainties. The reason is the difficulty...
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Emilio Andrea Maugeri (Paul Scherrer Institut)26/07/2022, 11:15
According to the Nuclear Data High Priority Request List published by the Nuclear Energy Agency (http://www.oecd-nea.org/dbdata/hprl/), values of cross sections used in nuclear technology should be known with uncertainties between 1% and 5%, while cross sections of key isotopes involved in s- and r-processes must be known with uncertainties of about 1%.
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The uncertainty associated with the... -
Beatriz Jurado26/07/2022, 11:15
Obtaining reliable cross sections for neutron-induced reactions on unstable nuclei is a highly important task and a major challenge. These data are essential for understanding the synthesis of heavy elements in stars and for applications in nuclear technology. However, their measurement is very complicated as both projectile and target are radioactive. The NECTAR (NuclEar reaCTions At storage...
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Yuval Waschitz26/07/2022, 11:15
Measurements of independent isotopic fission yields (IIFYs) provide access to the underlying probability distribution of products resulting from fission. The knowledge of IIFY distributions contributes to our understanding of the nuclear fission process in more depth with respect to mass yield distributions. A better understating of the fission process has wide implications, including the...
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Prof. Andrej Trkov (Jozef Stefan Institute)26/07/2022, 11:15
Iron is an important structural and shielding material that appears in many applications. Nuclear reaction data of iron have been addressed within the Subgroup-40 (CIELO) of the OECD/NEA Data Bank [1]. The resulting evaluated data files from the BNL/IAEA collaboration for the iron isotopes [2] were included in the ENDF/B-VIII.0 library [3] and performed well in criticality benchmarks....
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Noritaka Kitamura (University of Tennessee, Knoxville)26/07/2022, 11:39
The new generation of radioactive ion beam facilities will allow the production of unstable nuclei far away from the valley of stability. In the very neutron-rich region, the beta-decay energy window is much larger than the neutron separation energy of the daughter nucleus. Thus, delayed neutron emission after beta decay becomes a prevalent decay mode. To obtain information about the nuclear...
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Georg Schnabel (IAEA)26/07/2022, 11:39
We present the progress made in the evaluation of neutron-induced reactions of Fe-56 using a Bayesian network. The Bayesian network framework facilitates the incorporation of a diverse set of measurements, such as residual production cross sections and angular distributions. A nuclear physics model code in combination with Gaussian processes to take into account model imperfections is used in...
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Anton Tonchev26/07/2022, 11:39
Fission product yields (FPY) are essential ingredients for addressing questions relevant to a range of basic and applied physics. Examples include the cosmic nucleosynthesis processes that created the elements from iron to uranium, decay heat release in nuclear reactors, reactor neutrino studies, radioisotope production, development of advanced reactor and transmutation systems, and many...
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Ian Thompson (LLNL)26/07/2022, 11:39
The R-matrix method of Lane and Thomas is the standard procedure for modelling resonances at low energies, to determine widths and angular distributions needed for nuclear evaluations. Many different codes have been written, all with different input and output file formats. To ensure that results can be replicated, I have written a python code FERDINAND using FUDGE to read & write ENDF, GNDS...
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Riccardo Mucciola, the n_TOF Collaboration26/07/2022, 11:39
Cross-sections for neutron-induced interactions with molybdenum, in particular for the neutron capture reaction, play an important role in various fields ranging from nuclear astrophysics to safety assessment of conventional nuclear power plants and the development of innovative technologies. It is found as a pollutant in pre-solar silicon carbide grains and it has a crucial role in stellar...
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Gilles Noguere26/07/2022, 11:39
The zero-power reactor MINERVE (CEA Cadarache) was designed to perform reactivity worth measurements by the oscillation technique. The various experimental programs, undertaken for the last thirty years, involved cylindrical samples with a diameter of about 1 cm and a height ranging from a few cm to 10 cm. Most of the samples are composed of UO2 pellets with a given fission product, actinide...
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Mike Herman (LANL)26/07/2022, 11:51
LA-UR-21-29369
We use an example of Ta181 evaluation to illustrate modern evaluation methodology which, while based on the classic three pillars of the evaluation (differential experimental data, nuclear reaction modeling, and validation with integral experiments), makes predominant use of the "limited confidence" and "overall consistency" concepts. The limited confidence applies to all three...
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Veatriki Michalopoulou, the n_TOF Collaboration26/07/2022, 11:51
Neutron induced reaction cross section measurements are often performed relative to a neutron cross-section standard. Thus, the accuracy of the neutron standards determines the accuracy of the neutron cross section measurements. The $^{235}$U(n,f) cross section is widely used as reference reaction, while it is considered as standard at 0.0253 eV (thermal energy), between 7.8 and 11 eV and from...
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Maria Anastasiou, the NIFFTE Collaboration26/07/2022, 11:51
While nuclear data play an important role in nuclear physics applications, it has become important to have a better understanding and try to minimize their uncertainties. In particular, there is a need for precision neutron-induced fission cross section measurements on fissile nuclei. Neutron-induced fission cross sections are typically measured as ratios, with a well-known standard in the...
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Sukhjinder Singh26/07/2022, 11:51
$^{54}$Fe capture cross section measurements were conducted at the Rensselaer Polytechnic Institute (RPI) Gaerttner Linear Accelerator (LINAC) Center using an enriched $^{54}$Fe sample in the keV energy region. $^{54}$Fe is a constituent of natural iron, which is present in a large variety of nuclear grade materials.Therefore, it is important to have an accurate understanding of the cross...
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Ms María de los Ángeles Millán Callado (Centro Nacional de Aceleradores (CNA, US - Junta de Andalucía - CSIC) - Universidad de Sevilla (US), Dpt. Física Atómica, Molecular y Nuclear (FAMN))26/07/2022, 11:51
Pulsed neutron beams are a valuable tool in nuclear physics, but their applications are strongly restricted by the limited number of neutron sources available worldwide [1]. These neutron beams, suitable for "time of flight" (TOF) experiments, can be characterized by their time resolution, the intensity per pulse, and the frequency or repetition rate.
In terms of neutron production,...
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Gustavo Nobre (BNL)26/07/2022, 11:51
The different processes known in astrophysics to govern the successions of nuclear formation and decay, r-process and s-process, depend strongly on nuclear properties such as the intrinsic density of levels of a given nucleus and how they behave when emitting or absorbing particles such as neutrons, protons and/or photons. There are few experimental constraints that we can use to narrow down...
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Mr Benedikt Raab (TU WIEN)26/07/2022, 12:03
Three-body break-up channels play an important role in light nuclear systems even at low incident energies. In standard two-body R-matrix theory these processes can only be treated approximatively for instance by using sequential decay models. We will present a novel three-body R-matrix formalism that is based on a proposal by Glöckle [1]. In this framework the Faddeev equations are solved by...
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Jesse Brown (ORNL)26/07/2022, 12:03
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Eames Bennett26/07/2022, 12:03
Measurements of neutron elastic scattering and angular distributions remain one of the largest uncertainties in simulations of fission-driven nuclear systems. Current experimental techniques are limited by issues arising from measuring only neutrons or gammas or, in the case where both particles are measured, the relatively small number of angles current dual n-gamma detectors are capable of...
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Mr Yasunori Matsuo (Kindai University)26/07/2022, 12:03
Energy resolutions of pulsed neutrons are one of the important parameters for nuclear data measurement by TOF method. The energy resolutions are a facility-specific parameters, and has been evaluated experimentally and numerically at various TOF facilities using pulsed neutrons.
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KURNS-LINAC is an L-band electron linear accelerator with maximum acceleration voltage of 46 MeV established at... -
Tatsuya Katabuchi26/07/2022, 12:03
Tellurium isotopes are produced in nuclear reactors as fission products. Evaluation of neutron nuclear data of Tellurium isotopes was made recently [1]. On the other hand, $^{128}$Te is one of the candidate nuclides for neutrino-less double beta decay searches. Neutron-induced reactions of $^{128}$Te are important to evaluate background in measurement [2]. However, experimental data of the...
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Martin Schulc26/07/2022, 12:03
The systematic evaluations of spectrum averaged cross sections of dosimetric reactions over a broad range of energies were performed in 252Cf (spontaneous fission) and 235U(nth,f) neutron fields. The neutron sources used in this study were LR-0, VR-1 zero power research light water reactors, LVR-15 10 MW research light water reactor, and 252Cf high emission isotopic source with emission...
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Esther Leal Cidoncha26/07/2022, 12:15
The $^{233}$U plays an important role in the Th-U fuel cycle, that has been proposed as an alternative to the U-Pu fuel cycle due to its reduced amount of transuranium elements. The available experimental $^{233}$U(n,$\gamma$) cross section data in the literature are scarce and were measured decades ago [1-3]. In 2008, the $^{233}$U(n,$\gamma$) cross section was investigated at LANL using the...
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Nil Mont i Geli (Universitat Politècnica de Catalunya)26/07/2022, 12:15
Abstract
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Neutron production through α-induced nuclear reactions is a key issue in several fields. Specifically, (α,n) reactions are interesting in nuclear astrophysics as a source of neutrons for the slow neutron capture nucleosynthesis (the s-process) [TAI16] and in the α-particles capture process (the α-process) [WOO92, BLI17]. Other fields of interest include the neutron-induced... -
Victor Alcayne, the n_TOF Collaboration26/07/2022, 12:15
V. Alcayne a), A. Kimura b), E. Mendoza a), D. Cano-Ott a), T. Martinez a), E. González-Romero a), A. Pérez de Rada a), and the n_TOF collaboration c)
a) Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), E-28040 Madrid, Spain
b) Japan Atomic Energy Agency (JAEA), Tokai-mura, Japan
c) Conseil Européen pour la Recherche Nucléaire, CERN, SwitzerlandThe safe and...
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Hideto Nakano26/07/2022, 12:27
The long-term accumulation of Long-Lived Fission Products (LLFPs) in nuclear waste has been a significant issue in nuclear industry due to their long half-life. The nuclear transmutation of LLFPs into short-lived or stable nuclides is expected to contribute reducing the current amount of high-level radioactive waste. Highly accurate nuclear data for the neutron-induced nuclear reactions are...
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Magali Estienne (Subatech)27/07/2022, 06:00
Reactor antineutrino energy spectra are the subject of active experimental researches nowadays, either through large reactor neutrino experiments, short baseline neutrino experiments at research reactors or through dedicated nuclear physics measurements of the properties of the fission products. The summation method relies on the use of nuclear data to build the reactor antineutrino energy...
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Marc Dupuis (CEA, DAM, DIF)27/07/2022, 06:00
Nucleon inelastic scattering to the continuum can be adequately described through the exciton or quantum mechanical multistep direct (MSD) and multistep compound (MSC) pre-equilibrium models, as they account not only for the high energy component of particle emission spectrum, but also it provides initial conditions of the formed Compound Nucleus (CN).
It was previously shown that an ...
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Christophe Sage27/07/2022, 06:00
The study of nuclear fission yields has a major impact on the characterization and understanding of the fission process and is mandatory for reactor applications. In the framework of a collaboration between the CEA, the LPSC and the ILL, a program of actinide fission yields measurements has been initiated for several years at the LOHENGRIN spectrometer. However, the measurement of very low...
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Prof. Seung-Woo Hong (IBS/SKKU)27/07/2022, 06:00
The Nuclear Data Production System (NDPS) is an experimental system for measuring nuclear data by use of neutron Time-of-Flight detection systems built at Daejeon, Korea. The RAON (Rare isotope Accelerator complex for ON-line experiment) provides deuterons and protons up to 98 MeV and 83 MeV, respectively. They are accelerated by a superconducting driver LINAC and are delivered to the neutron...
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Ivan Alexander Kodeli (CCFE/UKAEA Abingdon)27/07/2022, 06:00
Working Party on International Nuclear Data Evaluation Co-operation Subgroup 47 (WPEC SG47) entitled "Use of Shielding Integral Benchmark Archive and Database for Nuclear Data Validation" was started in June 2019 with the objectives to promote a more systematic and wider use of shielding benchmark experiments in nuclear data and transport code validation and development, to provide feedback on...
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Dr Adina Olacel (Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH))27/07/2022, 06:00
The GAINS spectrometer operating at the GELINA neutron source (EC-JRC-Geel) is one of the best known setups within the nuclear data community. It provides reliable, high resolution $\gamma$-production cross-section data of importance both for the fundamental nuclear physics research and its many applications. The story of this spectrometer started around 2000 with just 2 large volume HPGe...
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Jesson Hutchinson (LANL)27/07/2022, 06:24
\documentclass{style/nseJournal}
\usepackage{enumitem}
\usepackage{xcolor}
\usepackage{hyperref}
\usepackage{cleveref}
\usepackage{graphicx}
\usepackage{rotating}
\usepackage{ulem}\newcommand{\beff}{$\beta_\mathrm{eff} $}
\newcommand{\keff}{$k_\mathrm{eff}$}\begin{document}
\title{EUCLID: A New Approach to Improve Nuclear Data Coupling Optimized Experiments with Validation using Machine...
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Pieter Mumm27/07/2022, 06:24
The Alpha-Gamma device at the National Institute of Standards and Technology (NIST) utilizes neutron capture on a totally absorbing $^{10}$B deposit to measure the absolute flux of a monochromatic cold neutron beam to better than 0.1% precision. Gammas produced by the boron capture are counted using high purity germanium detectors, which are calibrated using a precisely characterized alpha...
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Tyler Nagel27/07/2022, 06:24
Measurements of $^{35}$Cl(n,x) reaction cross sections were conducted at Lawrence Berkeley National Laboratory’s (LBNL) 88-Inch Cyclotron using neutrons produced via thick target deuteron breakup from a 14 MeV deuteron beam. These cross sections are vital to the design of Molten Chloride Fast Reactors (MCFR), especially in the 0.1 MeV – 1.0 MeV region where little experimental data exist but...
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Toshihiko Kawano (Los Alamos National Laboratory)27/07/2022, 06:24
Neutron inelastic scattering is one of the major nucleon-nucleus interactions in the fast energy range, and its cross section constantly increases above the threshold energy of the first excited state up to a few MeV. Since the inelastic scattering process changes the momentum of interacting neutrons and produces characteristic gamma-rays, high quality nuclear data for this process are...
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Dr Cheolmin Ham (Rare Isotope Science Project, Institute for Basic Science, Republic of Korea)27/07/2022, 06:24
Neutron beams have been utilized not only in the basic science, but also in the various industry sectors such as nuclear power, aerospace, defense industry, and semiconductor industry, over the past decades. Although the needs for the nuclear data using the neutron beam extensively have been increased worldwidely, however, it is still insufficient, in particular for the high energy...
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David Regnier27/07/2022, 06:24
Evaluating nuclear data reduces the information of a set of experimental data and theoretical models to provide the best estimate of a physical quantity. In the last decade safety applications pushed the evaluation community toward better quantification of the uncertainties associated to evaluated nuclear data. The Bayesian inference appears as a standard and versatile mathematical framework...
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Shuichiro Ebata27/07/2022, 06:36
The charge distribution of fission fragments is a significant quantity to estimate and evaluate the neutron emission yields from fission fragments. The distribution has been evaluated as the deviation from the unchanged charge distribution (UCD) assumption in which the fragments keep the neutron-proton ratio of the fissile parent nucleus. The deviation is called the charge polarization...
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Hye Young Lee27/07/2022, 06:36
Nuclear reaction data for neutron induced reactions on unstable nuclei are critical for a wide range of applications spanning from studies of nuclear astrophysics, nuclear reactor designs, and for radiochemistry diagnostics. However, due to the difficulty in performing this class of measurements, and the resulting lack of experimental data, nuclear data evaluations of the reaction cross...
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Mr Dal-Ho Moon (Sungkyunkwan University)27/07/2022, 06:36
The Nuclear Data Production System (NDPS) which is a neutron time-of-flight (TOF) experimental facility of RAON is under construction. The proton and deuteron beams are accelerated up to 83 and 98 MeV, respectively. The proton beams bombarded with a thin Li target will produce mono-energetic neutrons, and continuous-energy neutron spectra will be generated by colliding deuteron beams to a...
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Satoshi Kunieda (Japan Atomic Energy Agency)27/07/2022, 06:36
For thorough understanding resonant theories and cause of discrepancies among different cross-section measurements, development of an R-matrix analysis code AMUR is being progressed.
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The code is organized by “theoretical” and “experimental” classes based on the object-oriented framework. In the theoretical class, with sharing the same compound nucleus, the independent distant poles can... -
Christian Brazell (Texas A&M University)27/07/2022, 06:36
Christian Brazell
10/15/21
TAMU-LLNL
LLNL-ABS-827556
ND2022Surrogate Modeling for Fission Cross Sections, Criticality Studies, and Uncertainty Quantification
ABSTRACTComputational methods have advanced to the point where, in many cases, the main source of uncertainty in neutronics calculations comes from the underlying Nuclear Data (ND). Assessing the impact of the underlying uncertainties...
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Dr Bohumil Jansky (Research Centre Rez)27/07/2022, 06:36
Abstract
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The leakage neutron spectra measurements have been done on benchmark spherical assembly-nickel sphere with diameter of 50 cm and copper cube with an edge of 48.4 cm. The Cf-252 neutron source was placed into the centre of nickel sphere and copper cube. The proton recoil method was used for neutron spectra measurement using spherical hydrogen proportional detectors (HPD) with pressure... -
Alexandru Negret27/07/2022, 06:48
The extended dataset of 56Fe(n,ng) cross sections measured by our group more than a decade ago at GELINA [1] was used in many recent evaluations like ENDF, JEFF and CIELO. Despite the special measures we took to ensure reliability and accuracy, concerns were raised by various groups with regard to several features of our dataset (absolute normalization an/or shape) and therefore the...
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Thomas Srdinko27/07/2022, 06:48
A versatile R-matrix module for multi-channel reaction calculations was developed which allows not only phenomenological R-matrix analyses, but also extensions to new and non-standard formulations of R-matrix theory such as the Reduced R-matrix formulation and the hybrid R-matrix concept. An important feature of the module is the capability to combine standard R-matrix analysis with the result...
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Noah Kleedtke (LANL)27/07/2022, 06:48
LA-UR-21-29561
Abstract
Go to contribution pageHigh-fidelity simulation of nuclear systems are paramount to the operational success and safety of many nuclear applications. Simulations rely on quality nuclear data. The nuclear data input for these simulations is continuously being reassessed by nuclear data evaluators. One way to support this ongoing evaluation is to present the evaluators with detailed analysis... -
Atsushi Kimura (Japan Atomic Energy Agency (JP))27/07/2022, 06:48
In the field of radiation detection using Ge detectors, pulse pile-up rejection processing (PUR) is widely used. PUR reduces the distortion of the spectrum shape but it causes further increase of dead time. Many papers have been written on the dead time losses with PUR and methods to correct the influence [1],[2]. The proposed correction methods presuppose that the timing of pulses is random....
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Andreas Oberstedt27/07/2022, 06:48
The multi-humped fission barrier is the result of superposing microscopic shell corrections to the macroscopic liquid drop model [1]. A manifestation of that is the existence of shape isomers [2, 3], as observed in several actinide nuclides. However, the - most often - double-humped barrier is much more than just a concept, since it is related to several fission observables. These data may...
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Eric Matthews27/07/2022, 06:48
A Monte-Carlo method for the generation of correlation and covariance matrices for independent and cumulative fission yields has been developed. The method uses a constrained Monte-Carlo resampling structure in order to vary evaluated fission yield libraries in a way that meets basic conservation principles. This results in the generation of correlation/covariance matrices with limited model...
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Cecile Toccoli27/07/2022, 07:00
Verification and validation are essential components of the nuclear data development process, since only those data that have been demonstrated to accurately simulate real-life applications can be relied upon for those applications. While most nuclear data work relies on so-called 'differential' measurements, the validation of this work requires data from full systems also called Integral...
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James Benstead (AWE)27/07/2022, 07:00
A survey has been conducted of the resonance data available in the major evaluated libraries for a range of mid-mass isotopes. Although many isotopes have data derived from experimental measurements and rigorous analyses, the data for some others, particularly for isotopes that are unstable, are purely theoretically generated, e.g. via the use of the TARES code.
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A subsequent project has... -
Robert Grzywacz (University of Tennessee)27/07/2022, 07:00
Beta-delayed neutron emission is a dominant decay mode for the very neutron-rich nuclei. With the opportunities offered by new generation radioactive beam facilities, we can perform experiments with a larger and more exotic pool of isotopes. This enabled us to revisit the conventional views on the fundamentals of beta delayed neutron emission. However, new data and improved models are...
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Dr Cristiano Lino Fontana (European Commission, Joint Research Centre (JRC))27/07/2022, 07:00
MONNET is a fast neutron source based on a tandem-accelerator, located at the Geel (BE) site of the Joint Research Centre (JRC). It became operational in 2020. MONNET may deliver intense neutron beams in the energy range from $30~\text{keV}$ to $10.1~\text{MeV}$ and from $12.8~\text{MeV}$ to $24~\text{MeV}$. Neutrons are produced with protons or deuterons on lithium, tritium or deuterium...
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Cole Pruitt (Lawrence Livermore National Laboratory)27/07/2022, 07:00
Phenomenological optical model potentials (OMPs) have played an essential role in scattering calculations for several decades. Despite their successes, none have had their parametric uncertainty fully quantified, making reliable extrapolation difficult. To address this gap, we have developed a generic OMP uncertainty quantification framework that leverages Markov-Chain Monte Carlo for OMP...
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Dr Luiz Leal (IRSN)27/07/2022, 07:12
Reich-Moore (RM) approach has been extensively used in the resolved resonance energy range (RRR) for a wide range of isotopes. The Reich-Moore approximation was suggested late in the fifties for cross section representation of fissile isotopes since experimental fission width distribution according to given resonance spin and parity showed that only a few degrees of freedom (DoF) was involved...
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Stephan Pomp (Uppsala University)27/07/2022, 07:45
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Friederike Bostelmann (Oak Ridge National Laboratory)27/07/2022, 07:45
Non-light water reactor (non-LWR) concepts under development throughout the industry are significantly different from traditional LWR designs with respect to geometry, materials, and operating conditions. These differences result in significant differences with respect to the reactor physics behavior of non-LWRs as compared to LWRs. Given the limited operating experience with non-LWRs, the...
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Catherine Percher (Lawrence Livermore National Laboratory)27/07/2022, 07:45
The goal of the U.S. Nuclear Criticality Safety Program’s (NCSP) Thermal/Epithermal eXperiments (TEX) is to design and conduct new critical experiments to address high priority nuclear data needs from the nuclear criticality safety and nuclear data communities. The first set of five TEX experiments, using layers of plutonium-aluminum Zero Power Physics Reactor (ZPPR) plates stacked with...
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Dr Sophie Péru (CEA, DAM, DIF)27/07/2022, 07:45
The Gogny-based QRPA approach developed in CEA, DAM, DIF [1] can be applied to spherical as well as to axially deformed nuclei, from light (i.e. oxygen) to superheavy elements [2]. For electric and magnetic dipole modes, intensive computational efforts have been made to produce a large-scale data set of gamma-ray strength functions with as little as possible phenomenological corrections. The...
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Dr Rudra N. Sahoo (The Hebrew University of Jerusalem)27/07/2022, 07:45
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Dr Marcin Bielewicz (National Centre for Nuclear Research)27/07/2022, 07:45
It has been proposed to design and build an modular, a simple and effective cosmic ray detector (muon detector) that can be used both in laboratory measurements and in great physics experiments. The main goal of this system is to provide information from cosmic muons that pass the other detector in both in-beam and off-beam experiments for testing and calibration. Moreover, observation of...
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Daniil Koliadko27/07/2022, 07:57
The Nuclear Energy Agency's High Priority Nuclear Data Request List (HPRL) is a compilation of the highest priority nuclear data requirements. The U-120M cyclotron of the Nuclear Physics Institute of the Czech Academy of Sciences is a suitable tool for studies of several reactions from this list. In this paper, we present the measurements of the ${}^{7}$Be and tritium production in the lithium...
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Mr Gongtao Fan (Shanghai Advanced Research Institute, Chinese Academy of Sciences)27/07/2022, 08:09
Shanghai Light Source has been operated since 2009 to provide synchrotron radiations to 40 beamlines of the electron storage ring at a fixed electron energy, 3.5 GeV. The Shanghai Laser Electron Gamma Source (SLEGS) is approved as one of 16 beamlines in the Phase II project in 2016 to produce energy-tunable gamma-ray beams in the inverse Compton slant-scattering of laser photons from a 100 W...
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Mr Nicolas Leclaire27/07/2022, 08:09
The development of bias estimation methodologies has been a great tool for data uncertainty assessments. In particular, keff data and their uncertainties are becoming paramount for criticality-safety and reactor physics assessment. Moreover, the adjustment of cross sections implemented to match experimental keff within their uncertainty margins is important to produce the requested bias and...
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Emanuel Chimanski (Instituto Tecnológico de Aeronáutica)27/07/2022, 08:09
Nuclear structure and inelastic scattering have key roles in the study of the origin of elements in the Universe as well as in the modern medical treatments. A precise knowledge of reaction rates and particle absorption are of fundamental importance in the mass aggregation mechanism of r-process and increase the accuracy of radio isotopes production and radiation therapies. The theoretical...
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Darren Bleuel27/07/2022, 08:09
To investigate the use of argon as a deuteron beam stopping volume, the $^{40}$Ar(d,p)$^{41}$Ar cross section was measured at average deuteron energies of 3.6 MeV, 5.5 MeV, and 7.0 MeV using an activation method. Natural nickel foils were used as both beam degraders and monitors, as the $^{nat}$Ni(d,x)$^{61}$Cu reaction has historically been one of only a few IAEA-recommended beam monitor...
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Andrea Mattera27/07/2022, 08:09
Isomeric states have been observed in about 150 of the hundreds of isotopes that can be produced in the fission of major actinides. These isomers can be populated directly through fission, and the isomeric yield ratio (IYR) represents the relative population of the excited state(s) and the ground state (GS) independent yield.
Due to the underlying nuclear structure, the isomeric state often...
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Nathan Gibson27/07/2022, 08:09
In the last few decades, the field of nuclear data has been increasingly more diligent in the generation and use of uncertainty information related to nuclear data. This increased interest is fueled by the more wide-spread request for characterization of uncertainties, perhaps for quantifying performance margins or for identifying the best use of experimental resources. Use cases range, for...
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Kyle Wendt (Lawrence Livermore National Laboratory)27/07/2022, 08:21
Evaluated Means and Uncertainties, or EMU, is a new suite of tools for generating statistical realizations of nuclear data libraries encoded in the Generalized Nuclear Database Structure (GNDS). Built upon the For Updating Data and Generating Evaluations (FUDGE) package from LLNL, EMU is capable of reading and generating realizations of nearly any accessible nuclear data library, whether they...
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Jason Harke27/07/2022, 08:21
Over the past decade a series of measurements have been performed to determine fission product yields from a series of actinides. The National Criticality Experiments Research Center operates several critical assemblies one of which is Godiva. Godiva was operated in burst mode to produce a prompt fission neutron spectrum to fission actinide materials so that their relative yields could be...
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Dr Odsuren Myagmarjav (School of Engineering and Applied Sciences and Nuclear Research Center, National University of Mongolia, Ulaanbaatar 210646, Mongolia)27/07/2022, 08:21
The first excited $1/2^+$ state in $^9$Be has been observed as a sharp peak just above the $^8$Be+$n$ threshold energy in the photo-disintegration cross section of $^9$Be. Since the size of the peak has a strong influence on the reaction rate of the $^9$Be synthesis, experimental data have been investigated [1, 2].
We performed calculations using an $\alpha+\alpha+n$ three-cluster model [3,...
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Gongtao Fan (Shanghai Advanced Research Institute, Chinese Academy of Sciences)27/07/2022, 08:21
The laser Compton slant-scattering is a key technique to achieve the energy tunability in producing gamma-ray beams at synchrotron radiation facilities operated at a fixed electron energy. A pioneering attempt was made of generating MeV gamma-ray beams in the slant-scattering at 70 – 110o in the UVSOR-II electron storage ring [1]. The Shanghai Laser Electron Gamma Source (SLEGS) is dedicated...
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Mr Tomas Czakoj (Centrum Vyzkumu Rez ltd.)27/07/2022, 08:21
A new setup is being prepared in Centrum Výzkumu Řež for the measurement of prompt capture and inelastic gammas coming from neutron interactions. These gammas are important for safety during reactor operations (worker’s protection or radiation damage) or have applications in many areas like element identification in soil and space.
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The setup consists of an aluminum sphere with a 50 cm diameter... -
Adriana Ioana Gheorghe27/07/2022, 08:21
Photoneutron reactions on $^{208}$Pb in the Giant Dipole Resonance (GDR) energy range have been investigated at the $\gamma$-ray beam line of the NewSUBARU synchrotron radiation facility in Japan. The double magic $^{208}$Pb is a benchmark case for theoretical modeling of electric dipole response in nuclei. It has been extensively investigated through photonuclear reactions as well as through...
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Hirokazu Sasaki (LosAlamos National Laboratory)27/07/2022, 08:33
The giant dipole resonance (GDR) is one of the most well-known collective excitation modes since the dawn of research on nuclear physics. The origin of GDR is a collective motion of neutrons against protons inside the nucleus. Since its discovery in the photoabsorption cross section, extensive theoretical studies have been done to reveal the nature of such electric dipole excitation. The...
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Daniel Cano-Ott27/07/2022, 08:33
Neutron yields and energy spectra from ($\alpha$,xn) reactions are relevant data for several fields such as nuclear astrophysics, underground physics (low background measurements), nuclear technologies and applications like nuclear safeguards. The existing experimental data have been obtained with thin and thick targets often via activation measurements or in direct neutron measurements using...
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Marie-Anne Descalle (LLNL)27/07/2022, 08:33
The Generalized Nuclear Database Structure (GNDS) is an international nuclear data format meant to replace the half-century-old Evaluated Nuclear Data Format (ENDF-6). The current version of the specifications as defined by the Working Party on Evaluation Co-operation (OECD/NEA/WPEC) Expert group on GNDS (EGGNDS), includes specifications for the treatment of the unresolved resonances region...
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Andreea Oprea27/07/2022, 08:33
GELINA is a neutron time-of-flight facility installed at the European Commission Joint Research Centre (JRC) in Geel (Belgium), dedicated to neutron-induced cross section measurements for more than 50 years. GELINA’s experimental program focusses on nuclear applications and is strongly connected to the JEFF project. Measurements of the most relevant partial cross sections (capture, elastic,...
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Anthony Ramirez27/07/2022, 08:33
The LLNL-LANL-TUNL collaboration has been providing high-quality fission product yields (FPYs) from neutron-induced fission of $^{235}$U, $^{238}$U, and $^{239}$Pu [1]. Fission products have been measured using activation technique with monoenergetic and pulsed neutron beam produced at the tandem accelerator at the Triangle Universities Nuclear Laboratory (TUNL). The previous campaign...
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Patrick Griffin27/07/2022, 08:33
Silicon provides a good exemplar for a consideration of the critical parameters that affect the uncertainty for neutron dosimetry metrics, e.g., total kerma, ionizing kerma, displacement damage energy. In addition to the energy-dependent cross section uncertainty found in the ENDF-6 formatted nuclear data files, one must also address uncertainty due to: a) models used, e.g., modeling of the...
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Arthur Beloeuvre (Subatech)27/07/2022, 08:45
First-forbidden beta decays play an important role in several domains of physics. First, in astrophysics, where nuclear data such as the half-life govern stellar evolution and nucleosynthesis [1]. Second, they are of interest for nuclear reactors physics as first highlighted in 2014 [2]. In first-forbidden $\beta$-decays, the form factor of the leptonic spectra are not equal to one as for...
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Xavier Ledoux (Ganil)27/07/2022, 08:45
X. Ledoux on behalf of the NFS collaboration
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The neutrons for science (NFS)[1] is the running facility of SPIRAL-2 located at GANIL (France). It provides intense neutron beams in the 1-40 MeV range, produced by the interaction of proton or deuteron beams, delivered by the LINEAR accelerator of SPIRAL-2, with lithium or beryllium converters. The intense neutrons flux available and the large... -
Jack Silano27/07/2022, 08:45
The Bohr Hypothesis, one of the most fundamental assumptions in nuclear fission theory, states that the decay of a compound nucleus with a given excitation energy, spin and parity is independent of its formation $^{[1]}$. Using fission product yields (FPYs) as a sensitive probe, we have performed novel high-precision test of the combined effects of the entrance channel, spin and parity on the...
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Dr Romain BOFFY (CEA Cadarache)27/07/2022, 08:45
The transfer function of a zero-power thermal reactor was successfully measured by means of a pile noise experiment at low frequency. During a month-long experimental campaign, neutron fluctuations were acquired using excore fission chambers in a sub-critical state of the reactor. The analysis made use of the Cross-Power Spectral Density (CPSD) methodology. Firstly, the prompt neutrons kinetic...
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Mr Aman Gandhi (Department of Physics, Banaras Hindu University, Varanasi-221005, India)27/07/2022, 08:45
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Wim Haeck (LANL)27/07/2022, 08:57
A set of Python tools useful for benchmarking, benchmark selection, nuclear data validation, and nuclear data evaluation support called Faust is currently under development at Los Alamos National Laboratory. The goals and objectives for Faust are to:
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- Provide input and output processing for different calculation codes
- Allow for exchanging results between different applications and... -
Ms Tamara Korbut (Joint Institute for Power and Nuclear Research - Sosny)27/07/2022, 08:57
The non-proliferation issues caused by the civilian use of highly enriched uranium (HEU) were solved by using of several international agreements. Accordingly, efforts were made to reconstruct existing research reactors for using of low enriched uranium (LEU) and to encourage the usage of LEU in the development of new research reactors and other nuclear facilities, such as subcritical systems...
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Koushik Araseethota Manjunatha (Idaho National Laboratory)27/07/2022, 09:30
Condition-based monitoring (CBM) techniques are widely being adopted for maintenance activities in nuclear power plants. Asset operational data are collected by smart sensors mounted on and around the components. The sensed data is often gathered and processed by a monitoring and diagnostic center to garner various component fault signatures. These fault signatures are subsequently used as...
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John Gooding27/07/2022, 09:33
Experiments done at the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory to study super heavy elements and their basic physics and chemistry using the Berkeley Gas-filled Separator (BGS) and For the Identification of Nuclide A (FIONA) apparatuses are complex and employ dozens to hundreds of pieces of individual equipment setup in series and parallel along the beam-line.
Over the...
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Markus Widorski27/07/2022, 09:36
The FLUKA general purpose radiation transport Monte Carlo code being developed and maintained by CERN has adopted modern software development standards including a formal quality assurance process. This includes the FLUKAVAL testing framework that takes into account the specific needs of testing a Monte Carlo radiation transport simulation code.
FLUKAVAL is a...
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Sangeetha Prasanna Ram27/07/2022, 09:39
\begin{center}
\textbf{\large Application of Machine Learning algorithms for experimental data processing and estimation of $^{96}$\emph{Mo}(n, p)$^{96}$\emph{Nb} reaction cross section }\
\vspace{-10pt}
\hspace{10pt}% Author names and affiliations
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Sangeetha Prasanna Ram$^1$, Jayalekshmi Nair$^1$, Singh Vivek Virendra$^2$, Dhanamma Jagli$^2$, S. Ganesan$^3$, S. V. Suryanarayana$^3$... -
Mr Aman Sharma (Department of Physics, Banaras Hindu University, Varanasi-221005, India)27/07/2022, 09:42
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Tingtai Wang (Zhongyuan University of Techonology)27/07/2022, 09:45
All the cross sections of neutron-induced reactions, angular distributions, energy spectra, and double-differential cross sections for n+ 107, 109Ag reactions are calculated and analyzed below 20 MeV by using UNF code. The isomeric cross sections are also calculated. Furthermore the theoretical results are compared with the available experimental data and the evaluated results in ENDF/B-Ⅷ.0,...
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Sota Araki (Osaka University)27/07/2022, 09:48
Abstract:
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Accuracy of large angle scattering cross section in nuclear data have a large influence on precision of neutron transport calculation in fusion reactor design. In previous research, benchmark experiments for solid target were carried out, however, non-solid targets, which are covered by a casing, could not be dealt with. This is because we could not remove the casing effect in the... -
Libo Zhou27/07/2022, 09:51
Both neutron nuclear reaction data and fusion reaction data of $^4$He system play an important role in astrophysics and energy fields. Especially the microscopic nuclear cross section of the fusion reaction D(d,n)$^3$He is the core data among them. However, there are obvious differences among current experimental data for the incident energy from 0.2 to 1 MeV, and there is no experimental data...
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Dr Xianyi Zhang (Lawrence Livermore National Laboratory)27/07/2022, 09:54
The predicted reactor antineutrino flux is an important ingredient for particle physics measurements and neutrino-based safeguards applications, ranging from neutrino oscillation measurements to monitoring reactor fuel and operations. Over the past decade, comparisons between predictions and reactor neutrino experiments have revealed significant discrepancies which have motivated new neutrino...
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Viacheslav Mishin (JSC "SSC RF-IPPE")27/07/2022, 09:57
The necessity to operatively concern the growing needs of the BN-600 reactor support as well as the commissioning of the BN-800 reactor which also has a task of scientific support have led to the necessity of a new generation simulation support code development. This new generation code would make it possible to flexibly consider actual demands of scientific support of both reactors. In future...
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Roberto Capote (IAEA NDS)27/07/2022, 10:00
Evaluation of Neutron Data Standards have been a critical component of ENDF/B library releases which is currently coordinated by the IAEA. The latest Neutron Data Standards were released in 2017 [1] and were adopted for the ENDF/B-VIII.0 library [2]. Since very early on, the Neutron Data Standards have been derived using the Bayesian GMA code originally developed by W. Poenitz with an...
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Prof. Alain Hébert (Polytechnique Montréal)27/07/2022, 10:03
Abstract
The Blackshaw-Murray[1] elastic kernel represents the effect of neutron up-scattering caused by thermal motion of target nuclei and resonance elastic scattering on the multigroup scattering matrices. A first implementation of this model was proposed by Ouisloumen and Sanchez and made available in proprietary cross-sections libraries of the PARAGON and APOLLO lattice codes.[2]...
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Darya Panova (JSC "SSC RF - IPPE")27/07/2022, 10:06
The main objective of the article is development of a digital platform for visualization and processing of nuclear data.
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It is based on the idea of saving the experience accumulated over many years of working with libraries of nuclear-physical data for various purposes. The main task is to provide users with open and convenient access to various types of nuclear data archives for conducting... -
Lili Wen (China Institute of Atomic Energy)27/07/2022, 10:09
Recently, an advanced neutronics lattice code called Kylin-2 has been developed by Nuclear Power Institute of China. In order to develop multi-group library for Kylin-2, a fission product depletion chain simplification method was proposed in this paper to generate burnup data for the multi-group library. This method constructed two quantitative contribution functions based on the thought of...
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Ms Tejashree Phatak (Vivekanand Education Society's Institute Of Technology)27/07/2022, 10:12
\documentclass[12pt]{paper}
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\pagenumbering{gobble}\begin{center}
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\textbf{\large Regression analysis of experimental reaction
cross-section data of $^{241}$\emph{Am}(n, 2n)$^{240}$\emph{Am}}\... -
Dr Odsuren Myagmarjav (Nuclear Research Center, National University of Mongolia, Ulaanbaatar, Mongolia School of Engineering and Applied Sciences, National University of Mongolia, Ulaanbaatar, Mongolia)27/07/2022, 10:14
Fast neutron induced nuclear reaction cross section data are necessary for both nuclear energy technology and the study of nuclear physics research. The information of (n,2n) cross sections is quite essential in nuclear reactor technology as a significant portion of the fission neutron spectrum lies above the threshold of (n,2n) reaction for most structural materials. Furthermore, the...
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Leila Yettou27/07/2022, 10:16
In this study, the calculations of proton emission spectra produced by 58Ni(n,xp) reaction are used in the framework of preequilibrium models with the EMPIE and TALYS codes. Exciton model predictions combined with the Kalbach angular distribution syqtematics were used, and some necessary parameters have been investigated for our calculations. The comparison witj experimental data shows clear...
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Mr Ranjan Sariyal (Department of Physics, Panjab University, Chandigarh, India)27/07/2022, 10:18
\documentclass[12pt,a4paper]{article}
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\usepackage[utf8]{inputenc}
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\title{\myfont{\textbf{Comparison of binding energy from Atomic Mass Evaluation (AME-2020) with statistical model... -
Silvana Vasilca (National Institute for Physics and Nuclear Engineering IFIN-HH, Extreme Light Infrastructure - Nuclear Physics ELI-NP & IRASM Departemnt; 3University of Bucharest, Faculty of Chemistry, Department of Analytical Chemistry)27/07/2022, 10:20
Lately, novel radiation therapy methods using advanced laser technologies with ultra-high dose rates (“FLASH”), such as laser-accelerated particle beams and laser-driven ionizing radiation in pulses, with time spans from fs to ns started to emerge, having encouraging results in numerous studies concerning toxicity characterization [1,2]. Significant parameters of radiation therapies like high...
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David Heinrichs (Lawrence Livermore National Laboratory)27/07/2022, 10:22
The COG suite of criticality benchmarks has been formally expanded to 3,368 to cover the entire energy range from thermal to fast neutron spectra under a variety of reflector and moderator conditions and fissile materials. The number of benchmark cases in each of these six major categories is summarized in Table 1.
Table 1. Number of Benchmark Cases.
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Category Number of... -
博 史 (中国工程物理研究院研究生院), Dr 晓波 刘 (核物理与化学研究所)27/07/2022, 10:23
In order to compare the ENDF/B-VIII.0 and CENDL-3.2 Fe-56 nuclear data, 28 iron sensitive models were selected from the International Criticality Safety Benchmarking Experiments Evaluation Program. There are 21 highly enriched models and 7 plutonium mental models. The benchmark models were modeled in MC program and k_{eff} calculated with ENDF/B-VIII.0, with a hybrid ENDF/B-VIII.0 with...
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Konstantinos Kravvaris27/07/2022, 11:00
First-principles calculations have made great strides during the past years in bridging the gap from fundamental nuclear interactions derived from chiral effective field theory to the description of nuclear structure and dynamics. Due to their predictive capability, large-scale calculations can form the basis on which nuclear data evaluations can be performed. In this talk, I will outline a...
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Diego Ramos27/07/2022, 11:00
The fission process has intrigued physicists for a long time from both, experimental and theoretical points of view~\cite{Bohr,wil76,bro90}. The large deformations achieved in the process and the interplay between intrinsic and collective degrees of freedom prevent, so far, from a complete microscopic description of the phenomenon~\cite{sorting,scamps18,kh18}. The role of the nuclear structure...
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Dr John Bess (JFoster & Associates, LLC)27/07/2022, 11:00
The status of the two neutronics international benchmark projects sanctioned by the Organisation for Economic Co-operation and Development Nuclear Energy Agency (OECD NEA), the International Criticality Safety Benchmark Evaluation Project (ICSBEP) and the International Reactor Physics Experiment Evaluation Project (IRPhEP), was last directly discussed with the international nuclear data...
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Sotirios Chasapoglou27/07/2022, 11:00
The study of neutron induced reactions on Ge isotopes is of major importance, both for practical applications and fundamental research in Nuclear Physics. Practical applications include dosimetry, nuclear medicine, astrophysical projects, reactor and detector technology. As far as the fundamental research is concerned, some of the residual nuclei following (n,2n) and (n,a) reactions are...
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Chris Morse27/07/2022, 11:00
The Evaluated Nuclear Structure Data File (ENSDF) database is the comprehensive
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nuclear structure and decay database, containing all published experimental
nuclear structure and decay data for the 3300 observed nuclides, along with
carefully evaluated recommended values and uncertainties. ENSDF is the leading
source of nuclear structure and decay data worldwide for both basic and... -
Gerard Rovira Leveroni (Japan Atomic Energy Agency)27/07/2022, 11:00
Accurate nuclear data for neutron capture reactions of minor actinides (MA) are required to estimate the production and the transmutation rates due to their preponderant role in the study and design of transmutation systems related to nuclear waste management. Since its construction in 2009, continuous research efforts have been carried out to measure neutron-induced reactions at the Accurate...
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Erik Andersson Sundén (Uppsala University)27/07/2022, 11:12
The Chernobyl accident in 1986 deposited radioisotopes like $^{137}$Cs over large parts of Europe. Having a half-life of 30.2 years, $^{137}$Cs is still present in nature, including in mushrooms as well as wild boars, and has become an integrated part in many natural food chains.
In this article, we describe our facility UGGLA (Uppsala Generic Gamma Lab). UGGLA is designed to measure...
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Dr Milan Stefanik (Nuclear Physics Institute of The Czech Academy of Sciences, p.r.i.)27/07/2022, 11:24
The compact accelerator-driven fast neutron sources represent cheaper and smaller alternative to research nuclear reactors. They can be used (as a primary or supplementary tool) for many research activities realized at the nuclear reactors, such as the isotope production, sub-surface exploration, material research, neutron activation analysis, nuclear data provisioning, boron neutron capture...
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Donnie Mason27/07/2022, 11:24
The National Nuclear Data Center (NNDC) at Brookhaven National Laboratory (BNL) has developed and maintained NuDat, a web application where users can explore several databases containing nuclear structure, nuclear decay, and neutron-induced nuclear reaction information. NuDat is the primary web application used to query and visualize meticulously evaluated recommended values derived from all...
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Hye Young Lee27/07/2022, 11:24
Oxygen is present in many materials - water, oxides, concrete and elsewhere - and the uncertainties in its nuclear data can have a significant impact on many nuclear applications. The current status of the oxygen-16 data is a 30-50 % discrepancy among various $^{16}$O(n,$\alpha$) and $^{13}$C($\alpha$,n) cross section measurements. Reconciling these discrepancies and settling on a best value...
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Lucas Snyder (LLNL)27/07/2022, 11:24
The goal of the Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) is to measure fission cross sections with unprecedented precision. The NIFFTE Collaboration has designed and built a Time Projection Chamber (TPC) for this purpose. The tracking capabilities of this device allow for the full reconstruction of charged particles produced by neutron beam induced fissions from a thin...
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Xiaojun Sun (Guangxi Normal University)27/07/2022, 11:24
Based on the statistical theory of light nucleus reactions, the description of the complicated emission processes of proton and light composite charged particles are further improved through considering the effects of Coulomb barriers both in incident and different outgoing reaction channels. Moreover, the analysis of the reaction channels including the sequential and simultaneous emission...
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Mr Takashi Kanda (Kindai University)27/07/2022, 11:24
A small modular reactor (SMR) employing calcium hydride (CaH2) as a moderator have attracted attention to the passive safety and economic efficiency. Some integral experiments should be carried out to validate nuclear data of CaH2, however, no integral experiment by reactor for the validation have been reported. As the first integral experiment by reactor, a series of...
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Dr Chikara Konno (Japan Atomic Energy Agency)27/07/2022, 11:36
For the JENDL development we analyzed the iron in-situ experiment at the DT neutron source facility FNS in JAEA with the two-dimensional Sn code DORT and the latest nuclear data libraries: JENDL-4.0, ENDF/B-VIII.0 and JEFF-3.3. As a result, we found that the result with ENDF/B-VIII.0 reproduced the measured data worse than those with JENDL-4.0 and JEFF-3.3. Here we investigate this issue.
The...
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Elisa Pirovano, the n_TOF Collaboration27/07/2022, 11:36
The $^{235}$U(n,f) cross section is one of the most important cross-sections in many applications, and it is a standard at the thermal neutron energy point (0.025 eV), and from 0.15 MeV to 200 MeV. Above 100 MeV, it also plays an important role in understanding fundamental nuclear physics processes, as it can be related to the properties of excited nuclear matter. Above 50 MeV, however, the...
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Igor Moskalenko (Stanford University)27/07/2022, 11:36
A series of benchmark experiments with thin targets was carried out at ITEP in 1994 - 2009 in support of subcritical systems with an external neutron source (Accelerator Driven Systems, ADS) [1-3].
The cross sections for the formation of residual products of nuclear reactions were determined by the activation method ͟using precision γ-spectrometry. Thin samples made of material considered...
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Hamza Amar27/07/2022, 11:36
We present the results of the $^{35}$Cl(n,p)$^{35}$S cross section measurement using $^{10}$B(n,α)$^{7}$Li as reference at the n_TOF Experimental Area 2 (EAR-2) facility at CERN, providing data below 100 keV. On the one hand, this reaction is of interest in astrophysics as it is involved in the production of $^{36}$S, whose astrophysical origin remains unresolved [1], as well as the observed...
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Han Yi (Institute of High Energy Physics, CAS)27/07/2022, 11:36
The group of CSNS White Neutron Source (Back-n) has developed a prototype TPC for the physical experiments. The main design goal of white neutron source TPC is to measure the neutron induced light charged particle emitting nuclear reactions, and at the same time, it takes into account many applications such as fission cross section measurement, beam spot measurement and neutron radiography. At...
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Dr Viktor Zerkin (International Atomic Energy Agency)27/07/2022, 11:36
EXFOR (EXchange FORmat) database contains experimental nuclear reaction data compiled by the NRDC (Nuclear Reaction Data Centers) network. The network strictly regulates data format, rules of compilation, distribution of work and data exchange between data centers. The data dissemination is not regulated by the network - this includes output data formats, various database services, software...
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Wendi Chen (Beihang University)27/07/2022, 11:48
It is an open question in the fields of nuclear reactions to study the mechanism of reactions induced by the weakly bound nuclei at different incident energies with various target nuclei and calculate the reaction cross sections. The structure of weakly bound nuclei, which is easily broken up, plays an important role in their induced reaction and is thought to be the main reasons for their...
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Elizabeth McCutchan27/07/2022, 11:48
Nuclear data is an integral part of the activities in many disciplines,
including basic research, nuclear medicine, power generation, and others.
In order to meet the needs of practitioners in these fields, nuclear data must
be made available for their use and kept up-to-date. Doing so requires
that said data be produced and disseminated in an efficient manner.Brookhaven National Laboratory...
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Alexander Clark (LANL)27/07/2022, 11:48
\noindent Los Alamos National Laboratory\
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P.O. Box 1663, MS A143\
Los Alamos, New Mexico 87545\
Email: \url{arclark@lanl.gov}\
LA-UR-21-29584\ \
Nuclear data are widely used by the international community for a variety of applications, including criticality safety, reactor performance, and material safeguards. Despite the breadth of use-cases, critical benchmarks are primarily used for... -
Alice Manna, the n_TOF Collaboration27/07/2022, 11:48
The $^{235}$U(n,f) cross section is one of the most important neutron cross-section standards, and therefore it is recognized as a convenient reference for several other reaction cross-section measurements at thermal energy and between 0.15 MeV and 200 MeV. Outside these energy ranges the cross section is either not well known nor measured yet, as for example above 200 MeV, where evaluations...
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Vivek Chavan27/07/2022, 11:48
The development of accelerator driven systems, spallation neutron sources and other nuclear technologies require cross section data of neutron-induced reactions above 20 MeV. But the cross section data for neutron energies above 30 MeV are not so abundant in EXFOR, mainly due to the difficulties in obtaining monoenergetic neutron sources. Therefore, the activation cross sections have been...
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Godfree Gert27/07/2022, 12:00
The Generalized Nuclear Data Structure (GNDS) is the new international standard for the dissemination of nuclear reaction data. The GNDS structure is defined in a set of JSON files which allow for its implementation as follows:
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- a written report (illustrated in Figure 1) which supplements the GNDS description with examples; and
- post-processing of the JSON files to alternate formats, e.g.
o... -
Prof. Mayeen Khandaker27/07/2022, 12:00
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Daniel Fernandez27/07/2022, 12:00
During the last ten years, the use of inverse kinematics in the experimental study of fission is bringing a wealth of new observables obtained in single measurements, which allows their analysis and, also importantly, of their correlations [1, 2]. An ongoing application of this technique the basis of a series of experiments performed with the variable-mode, large-acceptance VAMOS++...
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167. First estimation of the kinetic parameters of LR-0 mock-up reactor in a reference configurationTimothée Kooyman (CEA)27/07/2022, 12:00
In the operation of nuclear reactors, the kinetic behaviour of the neutron population is driven by the delayed neutrons. The delayed neutrons fraction is thus one of the key parameters associated to nuclear safety.
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The kinetic parameters (delayed neutrons fraction and generation time) of the LR-0 reactor operated by Centrum výzkumu Řež were measured by CEA using a current-mode neutron noise... -
Nathan Gibson (Los Alamos National Laboratory)27/07/2022, 12:12
Across the nuclear data pipeline, it is important to drive improvements in validation and verification. One powerful tool in this process, for evaluation through applications, is simply visualizing the data. The ability to visualize nuclear data exists in many forms already, ranging from the legacy but robust tools in NJOY [1] (PLOTR and VIEWR) to the NEA’s Java-based Nuclear Information...
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José Luis Rodríguez Sánchez (Universidad de Santiago de Compostela)27/07/2022, 12:12
Fission reactions investigated in inverse kinematic at relativistic energies have proven
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to be a powerful technique to get access to a large variety of non stable heavy nuclei
[1] but also to fully identify, for the first time, in atomic and mass number both fission
fragments [2]. These systematic investigations made possible to establish the role of
proton shells in the asymmetric fission... -
Boris Pritychenko (NNDC, BNL)28/07/2022, 06:00
The comprehensive experimental nuclear reaction data compilations were pioneered at the Metallurgical Laboratory (University of Chicago) and Los Alamos National
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Laboratory [1,2] for the Manhattan Project needs. In 1947 many Manhattan Project alumni moved to a newly created Brookhaven National Laboratory to work on nuclear physics research and data compilations [3,4] in support of nuclear... -
Audrey Chatillon28/07/2022, 06:00
The anatomy of nuclear fission - a complex many-body process that has challenged precise modeling for decades - is explored via a comprehensive inverse-kinematics experiment. A Coulomb-fission measurement of relativistic $^{234,235}$U and $^{237,238}$Np projectiles at the GSI, using the R3B/SOFIA setup [1,2,3,4], was performed to identify on an event-by-event basis, in terms of their mass and...
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Gilles Noguere (CEA, DES, IRESNE Cadarache)28/07/2022, 06:00
The thermal scattering laws (TSLs) take into account the crystalline structure and atomic motions of isotopes bound in materials. This paper presents the CINEL code, which was developed to generate temperature-dependent TSLs for solid, liquid and free gas materials of interest for nuclear reactors.
CINEL is able to calculate TSLs from the phonon density of states (PDOS) of materials under...
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Benoit Mauss28/07/2022, 06:00
Neutrons emitted in fission events can be detected with remarkable precision using the highly segmented Chi-Nu neutron liquid scintillator array at the Weapons Neutron Research facility of the Los Alamos Neutron Science Center. In two recent studies, prompt fission neutron spectra (PFNS) [1] and average prompt fission neutron multiplicities [2] from $^{238}$Pu(n,f) were measured with respect...
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Alessandro Baroni (Los Alamos National Laboratory)28/07/2022, 06:00
It is reasonable to believe that in the not-too-distant future, quantum computing will revolutionize our ability to model and understand atomic nuclei and their interactions, and will find applications well beyond basic research. Advances in technologies that allow the production of quantum hardware with a larger number of qubits and significantly smaller error rates are still a few years...
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Magali Estienne28/07/2022, 06:00
The accurate determination of reactor antineutrino spectra remains a very actual research topic for which new interrogations have emerged in the latest years. Indeed, after the “reactor anomaly”[1] – a deficit of measured antineutrinos at short baseline reactor experiments with respect to spectral predictions – the three international reactor neutrino experiments Double Chooz, Daya Bay and...
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Allan Carlson (NIST and BNL)28/07/2022, 06:24
An effort is now underway to produce a new evaluation of the neutron cross section standards.
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It is important to maintain experimental programs to increase the quality and extend the database
for the neutron cross section standards in order to improve evaluations of them that will be used to convert cross section measurements made relative to those standards.
Measurements have been made for... -
Frank Gunsing28/07/2022, 06:24
The neutron capture cross section of $^{241}$Am is an important quantity for nuclear energy production and fuel cycle scenarios. Several measurements have been performed in recent years with the aim to reduce uncertainties in evaluated data. Two previous measurements [1,2], performed at the 185 m flight-path station EAR1 of the neutron time-of-flight facility n_TOF at CERN, have permitted to...
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Tobias Wright, the n_TOF Collaboration28/07/2022, 06:24
The average energy and multiplicity of prompt $\gamma$-rays from near thermal neutron induced fission of $^{235}$U have been measured using the STEFF detection setup at both the high-flux ILL research reactor and the neutron time-of-flight facility n_TOF. As highlighted by the NEA High Priority Request List, these quantities are of importance to the heating of non-fuelled elements of a...
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Giovanni Romanelli (Università degli Studi di Roma Tor Vergata and ISIS Neutron and Muon Source)28/07/2022, 06:24
Abstract
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Thermal neutron cross sections of hydrogenous materials are a fundamental ingredient for the simulation and design of, amongst other things, neutron moderators at research centres and nuclear reactors. However, experimental thermal cross sections are available for just a handful of materials (see, e.g., Ref. 1]). In order to match the level of detail in modern Monte Carlo nuclear... -
Kelsey Lund (North Carolina State University)28/07/2022, 06:24
The rapid neutron capture (r-process) is one of the main mechanisms whereby elements heavier than iron are synthesized, and is responsible for the creation of the heaviest stable isotopes of the actinides. Kilonova emissions are modeled as being largely powered by the radioactive decay of species synthesized via the r-process and in principle, observations of these offer insight into...
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Mr Zhihao Gao (Uppsala University)28/07/2022, 06:24
In nuclear physics the term meta-stable state refers to an excited state with an unusually long half-life, which can sometimes be even longer than that of the corresponding ground state. As a result, these states are often considered to be nuclei in their own right and, together with the corresponding ground state nuclei, they are referred to as isomers. The yields of...
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Gašper Žerovnik28/07/2022, 06:36
In spent nuclear fuel, $^{241}$Am is an important contributor to the decay heat and radiotoxicity for cooling times between several decades and a few centuries. Inherent $\gamma$-ray emission from $^{241}$Am aggravate time-of-flight (TOF) measurements of $^{241}$Am capture cross section. Alternatively, $^{241}$Am thermal neutron capture cross section and resonance integral may be estimated by...
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Dr Esben Klinkby (Seaborg Technologies)28/07/2022, 06:36
In recent years, molten salt reactor (MSR) concepts have seen renewed interest both within academia and emerging industry. Several widespread reactor concepts are developed, sharing the feature that the fissile fuel is dissolved in a molten fluoride or chloride salt which remains liquid over a wide temperature range at atmospheric pressure. One of the attractive features of MSRs is precisely...
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Shoto Watanabe (Hokkaido University)28/07/2022, 06:36
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Robert Casperson (LLNL)28/07/2022, 06:36
Adjustment is a useful tool for optimizing a nuclear data library for particular applications, but can also highlight deficiencies and suggest changes when employed with validation data that disagrees with an evaluation. Spectral indices validation data for ENDF/B-VIII.0 appear systematically higher than calculated values made using the evaluation. Adjustment with this data would lead to...
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Nathan Giha28/07/2022, 06:36
Heavy nuclei toe a delicate balance between the attractive strong nuclear force and the repulsive Coulomb force. When this balance is disrupted in favor of the Coulomb force, heavy nuclei may elongate and fission into two fragments. Fission was first observed over eighty years ago and theoretically explained shortly thereafter. We now know that good macroscopic and microscopic fission models...
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Israel Mardor (Tel Aviv University)28/07/2022, 06:36
Nuclear mass measurements give access to nuclear binding energies, which reflect the sum of interactions among its constituent nucleons. Certain double differences of neighboring nuclei binding energies provide $\delta$V$_{pn}$, the average interaction strength of the last one or two protons with the last one or two neutrons [1].
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We will present highly-accurate mass measurements of the... -
Oliver Gorton (San Diego State University)28/07/2022, 06:48
Currently, reaction measurements on fission products are being planned by the Nuclear Science PG at both Argonne Nat. Lab and at FRIB (Facility for Rare Isotopes, Michigan State). These indirect experiments produce specific short-lived nuclei via beta decay, and the subsequent neutron and gamma emission are studied. Some initial experiments found a surprising overabundance of gamma emission....
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Yu Kodama28/07/2022, 06:48
The management of high-level nuclear waste (HLW) from nuclear power plants is a significant issue to continue using nuclear energy in the future. To solve this, studies of nuclear transmutation system such as the accelerator-driven system (ADS) that transmute long-lived nuclides to shorter or stable ones due to neutron-induced reactions have been ongoing in recent years. Precise nuclear data...
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Douglas Di Julio (European Spallation Source ERIC)28/07/2022, 06:48
The design of neutron sources, using Monte-Carlo radiation transport codes, relies on the usage of thermal scattering libraries in the ACE format. These libraries are derived from models of neutron interactions in the materials of interest. We report here on the development of such libraries for applications related to cold and very-cold neutron sources [1]. For this purpose, we have used...
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Nikola Jovancevic (University of Novi Sad)28/07/2022, 06:48
N. Jovancevic$^1$, D. Knezevic$^2$, A.M. Sukhovoj$^3$, L.V. Mitsyna$^3$ M. Krmar$^1$,
$^1$) Department of Physics, Faculty of Science, University of Novi Sad, Serbia \
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nikola.jovancevic@df.uns.ac.rs\
$^2$) Institute of Physics Belgrade, University of Belgrade, Belgrade, Serbia\
$^3$)Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, Russian... -
Dan Mihai Filipescu28/07/2022, 06:48
Photofission and photoneutron reactions on $^{238}$U and $^{232}$Th were investigated in the energy range of 5.86 MeV – 20.12 MeV by quasi-monochromatic $\gamma$-ray beams produced in laser Compton-scattering at the NewSUBARU synchrotron radiation facility. Direct neutron-multiplicity sorting was performed with a flat-efficiency neutron detector [1]. Following Terrell’s prescription [2], a...
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Prof. Oscar Cabellos (Universidad Politécnica de Madrid (UPM))28/07/2022, 06:48
Recently, a second Target Accuracy Requirements (TAR) exercise has been launched in the framework of the WPEC/S46 on “Efficient and Effective Use of Integral Experiments for Nuclear Data Validation”. The TAR exercise aims at quantifying nuclear data needs (in terms of uncertainty reduction) to meet target accuracies on specific integral parameters. These target accuracies are driven by reactor...
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Dr Elias Vandermeersch (CEA)28/07/2022, 07:00
Nuclear data evaluation principally relies on adjustments of nuclear parameters on differential experiment data. To add another source of information, one may use integral experiments data. Usually, this process is applied on multi-group cross sections, with the help of deterministic transport code. However, nuclear data obtained are often biased toward the integral experiment studied, or the...
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Denise Neudecker28/07/2022, 07:00
LA-UR-21-29120
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Historically, there is little to no consistency between the various types of nuclear fission data in our libraries (Patrick Jaffke, NSE 190, 258 (2018)), despite the fact that we know these observables to be correlated through the joint fission process underlying them all. For instance, the energies and multiplicities of prompt neutrons and gamma rays are correlated through the... -
Mr Jonathan P. W. Crozier (North Carolina State University)28/07/2022, 07:00
Uranium Carbide (UC) is a nuclear fuel material, whose crystal binding may affect doppler broadening of epithermal neutron absorption resonances and scattering behavior of thermal neutrons. Currently, there is no Thermal Scattering Law (TSL) evaluation for UC in the ENDF/B-VIII.0 database. Ab-initio lattice dynamics (AILD) techniques are used to calculate the phonon spectrum using...
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Daler Amanbayev (Justus-Liebig-Universität Gießen, II. Physikalisches Institut)28/07/2022, 07:00
The N=Z=50 isotope $^{100}\text{Sn}$ has long been of interest from theoretical and experimental perspectives because it is the heaviest self-conjugate doubly-magic nucleus. Despite the significant progress in the last decade, the challenge of reaching it in experimental facilities remains to date. Systematic measurements of ground state masses and isomer excitation energies in its vicinity...
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Boris Pritychenko (NNDC, BNL)28/07/2022, 07:00
Recommended 2$\beta$(2$\nu$) half-lives and their systematics [1] are examined in the framework of a semi-empirical approach. Impacts of nuclear deformation, transition energy, and forbidden decay on half-live values were observed. These findings were used to predict T$_{1/2}$ for 35 isotopes of interest. Current results are compared with other theoretical and experimental works.
[1] B....
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Nikola Jovancevic28/07/2022, 07:00
N. Jovancevic$^1$, M. Krmar$^1$, S. Abou El-Azm$^2$, M. Demichev$^2$, D. Demin$^2$, M. Gostkin$^2$, V. Kobets$^2$, U. Kruchonak$^2$, A. Nozdrin$^2$, S. Porokhovoy$^2$, T.Shneydman$^2$, A. Zhemchugov$^2$, D. Knezevic$^3$, D. Maletic$^{3}$
$^1$) Department of Physics, Faculty of Science, University of Novi Sad, Serbia \
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nikola.jovancevic@df.uns.ac.rs\
$^2$) Dzhelepov Laboratory of Nuclear... -
Ramon Arcilla (NNDC-BNL)28/07/2022, 07:12
The benefits of containerized software in the deployment of applications are already well recognized and understood in the nuclear data community. In this regard, this paper describes how we migrated ADVANCE, NNDC’s continuous nuclear data quality assurance (QA) system, from the Buildbot CI/CD environment to an on-premise Kubernetes cluster of Docker containers which also serves as our new...
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Dr Tanvir Ahmed (Department of Nuclear Engineering, North Carolina State University)28/07/2022, 07:12
Hydrogen fluoride (HF) is a material commonly used in nuclear fuel processing and manufacturing. As HF is commonly used directly in conjunction with various forms of uranium, an accurate representation of the thermal cross sections is vital to criticality safety. To generate the thermal scattering cross sections for HF, a classical molecular dynamics (MD) simulation of the flexible HF system...
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Catherine Apgar (Department of Nuclear Engineering, University of California, Berkeley, Berkeley, California 94720, USA)28/07/2022, 07:12
The Auger-emitting nuclides $^{119}Sb$ (for which $^{119m}Te$ is a generator) and $^{117m}Sn$ are promising candidates for the treatment of small tumors and for use in radiosynoviorthesis, but there is little information available regarding the formation of these nuclei when targets are bombarded with high energy protons in large-scale isotope production facilities. A more precise cross...
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Song Feng28/07/2022, 07:12
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Alberto Pérez de Rada Fiol (CIEMAT)28/07/2022, 07:50
A better quantitative understanding of $\beta$-delayed neutron emission rates and spectra is relevant for nuclear structure, astrophysics, and reactor applications: $\beta$-delayed neutrons provide valuable information on the $\beta$-decay process, are needed in network calculations for understanding the stellar nucleosynthesis process, and can improve the understanding of the kinematics and...
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Ms Indah Rosidah Maemunah (Osaka University, Bandung Institute of Technology)28/07/2022, 07:50
Abstract
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In fusion reactor design, neutron leaks intensively from blanket material through a gap. In this streaming phenomenon, back scattering cross section is known to be very crucial. In the present study, the author’s team carried out a new experiment for benchmarking the large-angle scattering cross section of tungsten using a DT neutron source of OKTAVIAN facility, Osaka University,... -
Yaron Danon (Rensselaer Polytechnic Institute)28/07/2022, 07:50
In recent years there has been resurgence in the field of thermal scattering law (TSL) evaluations and experiments. This comes after years that this field was dormant with little updates to ENDF evaluations. Evaluated TSL is based on atomistic calculations that in most cases results in a phonon spectrum that can be processed to create the scattering kernel for use in applications. The...
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Osamu Iwamoto (Japan Atomic Energy Agency)28/07/2022, 07:50
Japanese Evaluated Nuclear Data Library version 5 (JENDL-5) was released in 2021. JENDL-5 is intended to extend its generality from JENDL-4.0 by covering a wide variety of nuclear data for applications not only to nuclear design and decommissioning, but also to radiation-related fields. Overview of JENDL-5 and a future plan for the next of JENDL-5 are presented.
JENDL-5 includes up-to-date...
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Adriana Sweet (LLNL)28/07/2022, 07:50
Our understanding of neutron-induced reactions on nuclei far from stability
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has far reaching implications for cosmogenic nucleosynthesis and fundamental
nuclear physics. Direct measurement of the radiative-capture cross section is experimentally inaccessible for these short-lived nuclei; however, indirect methods such as the ?$\beta$-Oslo Method enable the experimental constraint of key... -
Keegan Kelly (Los Alamos National Laboratory)28/07/2022, 07:50
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Vlad Avrigeanu (Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH))28/07/2022, 08:02
\documentclass[aps,prc,groupedaddress,amsmath,amssymb,12pt,tightenlines]{revtex4}
\usepackage{graphics}
\usepackage{longtable}\begin{document}
\title{Additional reaction mechanisms to statistical $\alpha$-emission and the related optical-potential validation}
\author{V.~Avrigeanu} \email{vlad.avrigeanu@nipne.ro}
\author{M.~Avrigeanu}\affiliation{Horia Hulubei National Institute for...
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Max Pallàs Solís (Universitat politecnica de catalunya (UPC))28/07/2022, 08:02
Around half of the nuclei heavier than iron are created via the rapid neutron capture process (r-process). For nuclear masses $A>100$, there are two main peaks in the r-process elemental solar system abundances, located at $A\sim 130$ and $A\sim 195$, which are associated with the neutron shell closure during the $(n,\gamma)$ $\leftrightarrow$ $(\gamma ,n)$ equilibrium. In contrast, the...
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Stanimir Kisyov (Lawrence Livermore National Laboratory, Livermore, California 94550, USA)28/07/2022, 08:14
The even-A stable Xe isotopes are placed in a mass region where a variety of nuclear phenomena emerge. In particular, $^{126}$Xe and $^{128}$Xe exhibit characteristics of transitional nuclei, a possible critical point in the shape transition from spherical to γ-soft, O(6)-like nuclei [1].
In order to probe the structure and collectivity of $^{126,128}$Xe, their properties were studied in...
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Jutta Escher (Lawrence Livermore National Laboratory)28/07/2022, 08:14
The availability of reliable nuclear data with quantified uncertainties is essential for basic and applied science. The last decade has seen much progress in the development of theory tools that allow us to achieve more accurate evaluations for compound (statistical) nuclear reactions. Integrated nuclear structure and reaction descriptions provide the basis for achieving consistent evaluations...
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Francois Claeys28/07/2022, 08:14
In the context of the development of Gen. IV nuclear reactors, the GIF (Generation IV. International Forum) has selected six innovative technologies. Among them, one can highlight the concept of breeding for $^{232}$Th/$^{233}$U and $^{238}$U/$^{239}$Pu fuel cycles. But those nuclei, crucial for such cycles, suffer from a lack of precise knowledge (nuclear structure, reaction cross sections)....
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Dr Jyoti Pandey (ITER-India, Institute For Plasma Research, Gandhinagar, Gujarat)28/07/2022, 08:14
Neutronics study is the backbone for the reactor Physics design. In both, fission and fusion reactor neutrons play an important role to the generation of electricity, by the conversion of their kinetic energy to heat energy. Fission neutrons have a maximum energy 2-3 MeV, while fusion neutrons coming from D-T plasma have a maximum energy of ~ 14.6 MeV. The Dynamics of fusion reactor neutrons...
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Dr Daniel Siefman (Lawrence Livermore National Laboratory)28/07/2022, 08:14
Pulsed-neutron die-away experiments (PNDA) can be useful benchmarks to validate neutron thermal scattering laws (TSLs). The experiment uses a neutron generator to impinge a short (~10-4 s) mono-energetic neutron pulse on a target sample. After the pulse, the neutron population within the sample moderates and reaches thermal equilibrium with a fundamental spatial mode and characteristic...
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Gustavo Nobre (BNL)28/07/2022, 08:14
The Cross Section Evaluation Working Group (CSEWG) is actively working to assemble its next library release, ENDF/B-VIII.1. In this contribution, we will outline progress toward this release. From the neutron sublibrary, there are several new evaluations from the INDEN collaboration (Cr, Mn, Fe, Si, 235U, 233U, 239Pu, 16,18O), and from others in...
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Dr Hyeong Il Kim (Korea Atomic Energy Research Institute)28/07/2022, 08:26
New evaluations of neutron-induced nuclear reactions on $^{54,56,57,58}$Fe through the CIELO [1] international collaboration were adopted by the ENDF/B-VIII.0 [2] library, released in 2018. These evaluations were performed by adjusting model inputs to reproduce available experimental data above neutron resonance regions. Since the latest release, two new experimental data sets are available;...
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Dr Ole Jens Nähle (Physikalisch-Technische Bundesanstalt)28/07/2022, 08:26
Improved current measurements for ionization chambers using the ULCA: A benchmark experiment to determine the F-18 half-life
Ole Nähle1), Dietmar Drung 1), Karsten Kossert 1), Hansjörg Scherer1), Marcell Péter Takács 1)
1) Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany
Corresponding author’s e-mail: ole.j.naehle@ptb.deIonization chambers play an...
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Greg Henning28/07/2022, 08:26
The necessary improvement of evaluated nuclear data for nuclear applications development is possible through new and high-quality experimental measurements, often combined with appropriate nuclear-reaction modelling. In particular, improving inelastic cross-section evaluations requires new and high-quality data.
Our group at CNRS-IPHC developed an experimental program to measure (n, n’...
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Dr Olivier Bouland (CEA Cadarache France)28/07/2022, 08:26
Since its introduction, the so-called surrogate-reaction method (SRM) has motivated the development and improvement of theories in connection to direct reactions. A recent paper~\cite{bou:20} has shown that the assimilation of experimental probabilities in the neutron cross section evaluation process can still be better estimated using tools resulting from the efforts made over the two last...
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Dr Vaibhav Jaiswal (Institut de Radioprotection et de Sûreté Nucléaire (IRSN))28/07/2022, 08:26
Thermal scattering law for ice based on neutron time-of-flight experiments carried out at the SEQUOIA spectrometer at the Oak Ridge National Laboratory
Vaibhav Jaiswal$^{1,*}$, Luiz Leal$^1$, and Alexander I. Kolesnikov$^2$
$^1$Insititut de Radioprotection et de Sûreté Nucléaire (IRSN), Fontenay-aux-Roses, France
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$^2$Neutron Scattering Sciences Division, Oak Ridge National Laboratory,... -
Zhigang GE (China Institute of Atomic Energy/China Nuclear Data Center)28/07/2022, 08:26
As the main output of CENDL project, the updated Chinese Evaluated Nuclear Data Library, CENDL-3.2 released in June 2020, which contains the neutron reaction data file which contained 272 materials, and the evaluated activation, fission yields, decay data and photonuclear data file are also included CENDL-3.2.
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Out of all 272 materials, the data for 135 materials are totally new，partly updated... -
Mark Gilbert28/07/2022, 08:38
Design engineering of future fusion experimental devices and near-commercial power plants are considering a variety of materials for the construction – some known and applied in the wider nuclear industry and some under development. When used in the extreme neutron environments predicted for the in-vessel components of future commercial and near-commercial magnetic-confinement fusion power...
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Dr Shinsuke Nakayama (Japan Atomic Energy Agency)28/07/2022, 08:38
JENDL-5 contains several sub-libraries to contribute to various applications. This presentation outlines the deuteron and alpha ones.
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Nuclear data on neutron-production reactions induced by deuteron are required in the fields of design of accelerator-based neutron sources. In such facilities, ($d,xn$) reactions on Li, Be, or C are employed to generate neutron beams. We have recently developed... -
Dal-Ho Moon28/07/2022, 08:38
The neutron production double-differential cross sections (DDX) from thin $^{nat}$C, $^{93}$Nb and $^{209}$Bi targets bombarded by 290 MeV/u $^{136}$Xe ions were measured by using the Heavy Ion Medical Accelerator in Chiba (HIMAC) facility of National Institute of Radiological Sciences (NIRS), Japan. The NE213 liquid organic scintillators were placed at the angles of 15°, 30°, 45°, 60°, 75°...
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Toshihiko Kawano (Los Alamos National Laboratory)28/07/2022, 08:38
Fluctuation in the observed resonance decay widths is often characterized by the Porter-Thomas distribution, or the chi-square distribution. Compound nucleus reaction modelings, in which the Gaussian Orthogonal Ensemble (GOE) is involved as a propagator, have been successfully applied to study the properties of fluctuation in the S-matrix (or the cross section). In the GOE models, the...
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Andrej Trkov28/07/2022, 08:38
Many transition metals react with hydrogen to form stable metal hydrides. Metal hydrides are technologically attractive materials because of their ability to store large amounts of hydrogen. There is considerable interest in zirconium hydrides in the nuclear industry because they are used as neutron moderators in nuclear reactors. TRIGA reactors have a unique fuel composition: a homogeneous...
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Alex Valentine (UKAEA)28/07/2022, 08:50
The accurate and efficient mapping of the radiation environment in a nuclear fusion reactor requires the most advanced radiation transport tools. The Monte Carlo method has long been deployed to deal with the complexity of fusion relevant geometries, with MCNP the adopted industry standard code among the European and wider international community in this field. However, reliance on a single...
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361. Advanced Modeling and Simulation Methods for Evaluation of Thermal Neutron Scattering MaterialsChris Chapman (Oak Ridge National Laboratory)28/07/2022, 08:50
With the rise of interest in thermal neutron scattering data for advanced reactor, criticality safety, and shielding applications, new experimental data is required both for evaluations of new materials or for re-evaluations (or validations) of previously evaluated materials. New experimental data is evaluated in a 3-step process: 1) computing the phonon characteristics (e.g....
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Joseph Gordon28/07/2022, 08:50
Improved inelastic neutron scattering and neutron-induced gamma-ray production data are needed for the next generation of nuclear technologies, from advanced reactors to space exploration, shielding applications, and detection platforms based on prompt neutron interrogation analysis.
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The Gamma Energy Neutron Energy Spectrometer for Inelastic Scattering (GENESIS), located at the 88-Inch... -
Goran Arbanas (ORNL)28/07/2022, 08:50
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Arjan Plompen (European Commission, Joint Research Centre, Geel)28/07/2022, 08:50
Following the release of JEFF-3.3 in late 2017, the JEFF coordination group took a step back to review its goals for a new major release, JEFF-4: for users, in terms of fields of application and performance, and within the project to modernize the methods for the production, testing and benchmarking of its evaluated files. Given the broad range of applications of a nuclear data library and the...
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Dr Florencia Cantargi (Atomic Energy Commission of the Argentine Republic, Argentine Neutron Beam Laboratory, Argentina.)28/07/2022, 09:02
VESUVIO is a spectrometer at the ISIS Neutron and Muon Source, Rutherford Appleton Laboratory (United Kingdom) that allows the measurement of the total cross-section of a sample material by the transmission and time of flight techniques, over a range of five decades in energy (10$^{-3}$ to 10$^{2}$ eV). At the same time, it allows a precise determination of the effective temperature of each...
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Victor Alcayne (CIEMAT (Spain))28/07/2022, 09:02
A segmented total energy detector (sTED) for (n, γ) cross section measurements at n_TOF EAR2
V. Alcayne1, D. Cano-Ott1, E. González-Romero1, T. Martínez1, E. Mendoza1, A. Sánchez-Caballero1, J. Balibrea2, C. Domingo-Pardo2, J. Lerendegui2 and n_TOF collaboration3
1CIEMAT, Spain
2IFIC CSIC-UV, Spain
3CERN, SwitzerlandThe neutron time-of-flight facility n_TOF [1] is characterised by its high...
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Dr Marilena Avrigeanu (Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH))28/07/2022, 09:02
\documentclass[aps,prc,groupedaddress,amsmath,amssymb,12pt,tightenlines]{revtex4}
\usepackage{graphics}
\usepackage{longtable}\begin{document}
\title{Role of direct interactions in $(d,p)$ and $(d,2p)$ reactions}
\author{M.~Avrigeanu} \email{marilena.avrigeanu@nipne.ro}
\author{C.~Costache}
\author{V.~Avrigeanu}\affiliation{Horia Hulubei National Institute for Physics and Nuclear...
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Dr Francisco Alvarez-Velarde (CIEMAT)28/07/2022, 09:02
The safe management of the spent nuclear waste (SNF) requires a special effort of characterization, since its isotopic composition is the key to its transport, handling and storage by means of the decay heat, gamma emission and neutron emission it produces due to radioactive decay.
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The effort is being done in the frame of the EU EURAD project (European Joint Programme on Radioactive Waste... -
Paraskevi Dimitriou (International Atomic Energy Agency)28/07/2022, 09:40
Radionuclide monitoring involves measurements of the concentrations of radioactive particles and noble gases in air, soil, and liquid samples. After collection and appropriate treatment of the samples, γ and β emissions are measured by means of Ge detectors and β counters, respectively. Quantification of such spectra relies heavily on up-to-date evaluations of the nuclear structure and decay...
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Jose Ignacio Marquez Damian (European Spallation Source)28/07/2022, 09:40
NJOY+NCrystal is an open source tool which can be used to generate thermal neutron scattering libraries in a format that supports both coherent and incoherent elastic components for crystalline solids. The tool is based on a customized version of NJOY2016 [1] which calls the thermal scattering software NCrystal [2] for the calculation of the elastic components. The libraries can both be...
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383. Evaluation of the neutron-induced cross sections of actinides using the CONRAD computer programGilles Noguere (CEA, DEN Cadarache)28/07/2022, 09:40
The CONRAD computer code is being developed by the nuclear data group of CEA Cadarache by since mid-2000. It was originally designed to analyse neutron-induced reactions in the resonance energy range and then, was extended to higher energies (several MeV) treatment with inclusion of charged-particles penetration factor. In the resonance range, nuclear models implemented in the CONRAD program...
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Toni Kogler28/07/2022, 09:40
Precise neutron-induced fission cross-sections of actinides such as the plutonium isotopes are of relevance for the development of future transmutation technologies and 4$^\text{th}$ generation of nuclear reactors. In contrast to thermal reactors, these future technologies employ the fast-neutron spectrum.
For $^{242}$Pu current uncertainties of the fission cross section in the energy region...
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Dr Karsten Kossert (Physikalisch-Technische Bundesanstalt)28/07/2022, 09:40
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Mr Antonio Jimenez-Carrascosa (Universidad Politécnica de Madrid)28/07/2022, 09:40
Nuclear data processing is the procedure devoted to the conversion of evaluated nuclear data into libraries suitable for specific final applications such as neutron transport or inventory calculations. AMPX is the modular processing code of SCALE Code System that takes basic cross section data in Evaluated Nuclear Data File format to provide both multigroup and continuous energy libraries for...
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Caleb Mattoon (Lawrence Livermore National Lab)28/07/2022, 09:52
FUDGE (For Updating Data and Generating Evaluations) is an open-source code that supports reading, visualizing, checking, modifying, and processing nuclear reaction and decay data. For ease of use the frontend of FUDGE is written in Python while C and C++ routines are employed for computationally intensive calculations.
FUDGE has been developed primarily at Lawrence Livermore National...
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Andrew Till (LANL)28/07/2022, 10:04
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Dorothea Schumann (Paul Scherrer Institut Villigen, Switzerland)28/07/2022, 10:04
Knowing the half-life of a radioactive isotope as precisely as possible is crucial for many research areas, for example nuclear astrophysics, nuclear energy technology or environmental research. Radionuclides with half-lives of hundreds to millions of years are particularly important, not only because of their significance in the relevant scientific field but also because of their potential...
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Prof. Alain Hébert (Polytechnique Montréal)28/07/2022, 10:04
Abstract
The ELECTR module of NJOY is designed to produce complete and accurate multigroup electroatomic cross sections from ENDF/B-IV, -V -VI or -VII data[1]. It will also work with the newer formats developed for ENDF/B-VII. ELECTR produces restricted cross sections consistent with a solution of the multigroup Boltzmann-Fokker-Planck (BFP) equation. Total, elastic, inelastic (collision...
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Roberto Capote (IAEA NDS)28/07/2022, 10:04
A comprehensive reevaluation of $^{239}$Pu transport cross sections from subthermal energies up to 30 MeV within the INDEN collaboration is presented. Softer prompt fission neutron spectra (PFNS) for thermal neutron-induced fission with an average energy of 2.08 MeV from the IAEA evaluation is combined with new resonance parameters and new nubar evaluation to preserve the good criticality...
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Thomas Kittelmann (European Spallation Source ERIC)28/07/2022, 10:04
Initially born out of the needs of the ESS Detector Group to enhance the realism of thermal neutron scattering in Geant4-based detector design studies, the NCrystal project has grown into a generic backend for such modelling -- which is both flexible, efficient, and available under a liberal open source license. In this contribution we present the project, including both design philosophy, an...
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Marian Boromiza28/07/2022, 10:04
A new (n,n'γ) experiment was performed at the Geel Electron LINear Accelerator (GELINA) of the European Commission-Joint Research Center (EC-JRC) to measure high resolution neutron cross-sections on several nickel isotopes. To detect the radiation of interest we made use of the Gamma Array for Inelastic Neutron Scattering (GAINS) spectrometer which consists of twelve HPGe detectors with 100%...
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Nicholas Scielzo (Lawrence Livermore National Laboratory)28/07/2022, 10:16
Fission-product yields are one of the most fundamental pieces of nuclear data associated with nuclear fission, and they play an important role in fundamental neutrino science, nuclear energy, nuclear medicine, and national security. One of the most straightforward and reliable ways to determine fission-product yields is via detection of the characteristic γ rays emitted following the β decay...
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Yihan Huang (Xi'an Jiaotong University)28/07/2022, 10:16
The latest evaluated nuclear data libraries, including ENDF/B-VIII.0, TENDL2019, all have two formats, the Evaluated Nuclear Data File (ENDF-6) nuclear data format, and the Generalised Nuclear Database Structure (GNDS). The first official public documentation of all of the options for storing data in GNDS was released by the Working Party on International Nuclear Data Evaluation...
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Dr N. Colby Fleming (Department of Nuclear Engineering, North Carolina State University)28/07/2022, 10:16
The Full Law Analysis Scattering System Hub (FLASSH) is an advanced code which evaluates the thermal scattering law (i.e. TSL, S($\alpha$,$\beta$)) for thermal scattering cross sections and resonance Doppler broadening. These features in the cross section are both fundamentally driven by target atom vibrations, which are impacted by the nature of the chemical binding and temperature of the...
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Dr Olivier Bouland (CEA Cadarache France)28/07/2022, 10:16
The evaluation state-of-the-art according to the $^{239}$Pu(n,2n) angular-integrated reaction cross section is well synthesized by Fig.1, enclosed, on which are drawn from one side, experimental data and on the other side, some major evaluated curves. Recent evaluations, by contrast to the old JEF-2.2 data file, remain consistent except near threshold and at energies above the maximum of the...
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Ahmed Naceur (École Polytechnique de Montréal)28/07/2022, 10:16
The NJOY nuclear data processing system is widely used for pointwise and multigroup neutronic and photonic cross sections production from Evaluated Nuclear Data Files (ENDF). Current restriction to neutral particles-induced evaluations limits the scope of the system's mission to applications related to fission and fusion reactor design, licensing and safety analysis, stockpile stewardship...
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Klaus Guber28/07/2022, 10:16
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Cesar Domingo Pardo, the n_TOF Collaboration28/07/2022, 10:28
Radiative neutron-capture cross sections are of pivotal importance in many fields such as nucleosynthesis studies or innovative reactor technologies. A large number of isotopes have been measured with high accuracy, but there are still a large number of relevant isotopes whose cross sections could not be experimentally determined yet, at least with sufficient accuracy and completeness, owing...
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Dr Aurelian Luca (IFIN-HH), Xavier Mougeot (CEA)28/07/2022, 10:28
Reliable and precise nuclear decay data are essential in many applications. In radionuclide metrology, decay data are input parameters in calculations related to radioactivity measurements, when absolute or relative standardisation methods are used. This is why the metrology community, especially in Europe, has carefully evaluated decay schemes and atomic and nuclear data for the last 50...
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Gregory Potel Aguilar (LLNL)28/07/2022, 10:28
Neutron-induced cross sections on fissile nuclei such as $^{239}$Pu are important for defense and energy applications, as well as for basic science. The quality of these values rely on two basic pillars: a) the availability of high-quality, curated experimental data. Within this context, it is essential to constantly update the existing database with the new experiments carried out in...
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Shree Neupane (University of Tennessee)28/07/2022, 10:28
An efficient neutron detection system with good energy resolution is required to correctly characterize decays of neutron-rich nuclei where beta-delayed neutron emission is a dominant decay mode. Precision neutron spectroscopy instrumentation is essential to probe nuclear structure effects in neutron-rich nuclei in new generation radioactive beam facilities. A new high-resolution neutron...
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Paul Romano (Argonne National Laboratory)28/07/2022, 10:28
This paper describes methods for processing and use of thermal neutron scattering data in OpenMC. OpenMC relies on NJOY to process thermal scattering ENDF evaluations into ACE files, which are then converted to HDF5 files by OpenMC's Python API. This process is fully automated with OpenMC producing an NJOY input deck containing appropriate options for each module and covering every temperature...
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Jordan McDonnell28/07/2022, 10:28
\documentclass[11pt]{article}
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\usepackage{geometry} % See geometry.pdf to learn the layout options. There are lots.
\geometry{letterpaper} % ... or a4paper or a5paper or ...
%\geometry{landscape} % Activate for for rotated page geometry
%\usepackage[parfill]{parskip} % Activate to begin paragraphs with an empty line rather than an... -
Adrien Sari (Université Paris-Saclay, CEA, List, F-91120 Palaiseau, France)28/07/2022, 10:40
Few data exist regarding the yields and the six group time spectra of delayed neutrons from the photofission reaction on actinides. In 1966, Nikotin et al. published data for the photofission of 232Th, 235U, 238U and 239Pu induced by Bremsstrahlung photons with an endpoint energy at 15 MeV. In 1970, Kull et al. presented data for the...
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Alexander Kavner (LLNL)28/07/2022, 10:40
We are re-measuring the half-lives of $^{146}$Sm and $^{147}$Sm to improve the accuracy of Sm-Nd chronometers for early solar system chronology. The samarium sources are fully embedded into small Au foils and coupled to cryogenic microcalorimeters that measure heat released from each Sm alpha decay. This new detection method provides near 100% detection efficiency and a few keV energy...
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Carole Chatel (CEA)28/07/2022, 10:40
The neutron fission cross section of the 242Pu target nucleus is being studied both experimentally and theoretically since at least five decades. Past studies include early measurements and derived resonance analyses as those by Auchampaugh et al. [1,2] and Weigmann et al. [3] and, since 2008, date of a renewed High Priority Request List demand according to the fission experimental data, a new...
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Mr Yongqiang Tang (Xi'an Jiaotong University)28/07/2022, 10:40
Accurately describing the scattering behavior of thermal neutrons can guarantee the accuracy of neutronics calculation. The thermal neutron scattering law (TSL) data is used to describe the scattering property of a materials. In this work, some efforts have been made to improve the accuracy of TSL data. The anisotropic displacement parameters method is used to remove the cubic approximation in...
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Shoichiro Kawase28/07/2022, 11:30
The long-lived fission products (LLFPs) produced in nuclear reactors have been an important issue because of the difficulty of disposal due to their long lifetimes. Therefore, some treatment methods to transform the LLFPs into short-lived or low-toxic materials are desired, and nuclear transmutation technology is expected to be one of the solutions. However, the reaction data of LLFPs required...
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Vasilis Vlachoudis (CERN)28/07/2022, 11:30
FLUKA [1,2,3] is a multipurpose Monte Carlo code for the simulation of particle transport and interaction with matter. FLUKA relies on dedicated models for hadronic interactions, with the notable exception of low-energy neutrons (below 20 MeV), for which a group-wise treatment based on evaluated nuclear data has been employed for a sizable list of relevant isotopes. A point-wise treatment was...
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He Wang (RIKEN)28/07/2022, 11:30
Reduction in the quantity of high-level radioactive waste in the spent fuel is one of the major issues for the use of a nuclear power plant. In recent years, substantial research and development activity has been devoted to the partitioning and transmutation technology for the reduction and recycling of radioactive waste. The transmutation on the long-lived fission products (LLFPs) in the...
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Dr Francesc Salvat Pujol (European Organization for Nuclear Research (CERN)), Gabriela Moryc (European Organization for Nuclear Research (CERN))28/07/2022, 11:43
A dedicated model for low-energy (<150 MeV/n) deuteron nuclear reactions has been a long-standing shortcoming of FLUKA [1-3], a general-purpose code for the Monte Carlo simulation of radiation transport. In view of the recently increasing interest in deuteron transport (e.g. for radioisotope production in medical applications [4-5] and for nuclear fusion studies [6]), a model for...
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Dr Shin-ichiro Meigo (J-PARC/JAEA)28/07/2022, 11:54
In high-intensity proton accelerator facilities such as Accelerator Driven System (ADS) and the spallation neutron source, it is crucial to evaluate the damage of beam-interception materials and accelerator components, such as a magnet coil. The displacement per atom (dpa) is used as a damage index, which is derived by integrating the particle flux and the displacement cross section based on...
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Cristina Clisu-Stan28/07/2022, 11:54
A high-and-flat efficiency moderated neutron detection array has been recently developed for photoneutron cross section measurements at the future ELI-NP gamma-ray beam source. It is composed of three concentric rings of 4, 8 and 16 $^3$He proportional counters embedded in a high density polyethylene block and has a ~37% efficiency flat within 5% in the 10 keV to 5 MeV neutron energy interval....
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Michael Rising (LANL)28/07/2022, 11:55
The CGMF code, which models the correlated particle emissions from fission events of various spontaneous and neutron-induced fissile systems, is now available as open-source software [1]. In the previous release of MCNP, version 6.2, the CGMF code was integrated and was optionally available to perform inline low-energy fission event simulations targeted toward nuclear nonproliferation and...
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Min Jia (North China University of Water Resources and Electric Power)28/07/2022, 12:06
All cross sections, angular distributions, energy spectra, and double-differential cross sections for n + 58,60,61,62,64, nat.Ni reactions are consistently calculated and analyzed in the incident neutron energies from 0.001 to 200 MeV by using nuclear theoretical models, including the optical model, the unified Hauser-Feshbach theory and the exciton model, the improved Iwamoto-Harada model,...
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Hiroki Iwamoto28/07/2022, 12:06
An accelerator-driven transmutation system (ADS) is a potential candidate for treating high-level radioactive waste generated from nuclear power plants. For predicting the radioactivity of the components of ADS and assessing impurity behavior in lead-bismuth eutectic (LBE), nuclide production cross sections play a vital role. So far, we have measured 7 nuclide production cross sections in the...
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Camilo Cordero Ramirez (CEA)28/07/2022, 12:07
Nuclear data in the different libraries (ENDF/B, JEFF, JENDL, CENDL) for the description of the outgoing particles are very often expressed as averaged distributions. This is the case, for example, of the (n,2n) reaction, for which we find only one energy distribution with a multiplicity equal to 2. The situation is quite similar for neutron capture (n,g) with an average photon number and an...
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82. Measurement of the neutron total cross section of 9Be at the Back-n white neutron source of CSNSMr Jiangbo Bai (Fudan university)28/07/2022, 12:18
The neutron total cross section data of 9Be plays an important role in nuclear structure model of light nuclei and nuclear power installations. A measurement of the neutron total cross section of 9Be in the 1eV-30MeV energy region has been carried out using time-of-flight method and transmission method by the neutron total cross-sectional spectrometer (NTOX) based on the multi-layer fast...
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Francisco Javier Ferrer Fernandez28/07/2022, 12:18
Due to the introduction of several novel applications of He implantation, e.g. in materials of future fusion reactors [1 and in optical waveguides [2, 3], the need for elemental analysis of helium has recently increased dramatically. Depth profiling of helium can be realized by several ion beam analysis methods. Proton elastic backscattering spectrometry (p-EBS) is a basic method for such...
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Dr Igor Moskalenko (Stanford University)28/07/2022, 12:19
Modern theoretical studies and industrial applications related to the design, radiation protection, and reliability of nuclear facilities, medical applications, as well as space research and exploration are relying on extensive simulations and modeling. Computer codes realizing various semi-classical and quantum molecular dynamics (QMD) approaches are often employed to make up for the lack of...
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Yukinobu Watanabe28/07/2022, 12:30
Intensive fast neutron sources using deuteron accelerators have been proposed for the study of medical RI production, radiation damage for fusion reactor materials, nuclear transmutation of radioactive waste, and so on. Neutron production data from various materials bombarded by deuterons are required for the design of such neutron sources. However, the experimental data, e.g....
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Xinwu Su (Shanxi Datong University, China)28/07/2022, 12:30
Nuclear data for alpha particle induced reactions on 58,60,61,62,64,nat.Ni plays an important role in the application of nuclear techniques like charged particle activation analysis, medical isotope production, estimation of neutron yield and residual activity of accelerator components or simulation of radiation damage. All cross sections of α-induced reactions, angular distributions, energy...
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Hiroki Iwamoto28/07/2022, 12:42
For accurate prediction of neutronic characteristics for accelerator-driven systems (ADS) and a source term of spallation neutrons for reactor physics experiments for the ADS at Kyoto University Critical Assembly (KUCA) [1], we have launched an experimental program to measure nuclear data on ADS using the Fixed Field Alternating Gradient (FFAG) accelerator at Kyoto University. As part of this...
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Elizabeth McCutchan29/07/2022, 06:00
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Zhizang GE29/07/2022, 06:15
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Gustavo Nobre29/07/2022, 06:30
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Arjan Plompen29/07/2022, 06:45
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Osamu Iwamoto29/07/2022, 07:00
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Dr Arjan Koning (IAEA)29/07/2022, 07:15
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Patrick Blaise29/07/2022, 08:00
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Ethan Balkin29/07/2022, 08:30
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David Matters29/07/2022, 09:00
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Tim Hallman (DOE)29/07/2022, 09:30
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Enrique M. González Romero (CIEMAT)29/07/2022, 10:00
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29/07/2022, 10:10
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Sebastian Urlass
The $^{16}$O(n,$\alpha$)$^{13}$C reaction plays an important role in nuclear technology [1,2]. Oxygen is a major component of the fuel and in the water coolant of nuclear power reactors. This reaction influences criticality through the removal of neutrons and produces helium in the fuel which may lead to swelling.
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A new reaction cross section measurement was carried out at the time-of-flight... -
Adrian Sanchez Caballero, The n_TOF Collaboration
The reduction of the uncertainties of neutron capture and fission cross sections of major and minor actinides is important for the improvement of the design of nuclear reactors and the optimization of nuclear waste management strategies, especially in life extension and higher burnup scenarios. In particular, neutron capture on $^{240}$Pu is the responsible for the formation of $^{241}$Am, via...
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Daniel Votaw
(n,Z) reaction cross sections on stable, structural materials at fast neutron energies are important for understanding H and He production in fusion and Gen IV fission reactors. But for certain reactions, or at certain energies, data are sparse, and evaluated cross sections disagree. Improved measurements of exclusive cross sections and angular distributions are needed to inform evaluations....
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Andrew Ratkiewicz (Lawrence Livermore National Laboratory)
Nuclear data libraries are an essential part of ensuring the safety, reliability, and effectiveness of nuclear reactors, nuclear medicine, and the Nation’s nuclear weapons stockpile, as well as being an essential resource for scientists studying nuclear astrophysics, nuclear structure, archeology, and many other subjects. These nuclear data libraries, which have been constructed from...
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Dr Muhammad Naveed Aslam (COMSATS University Islamabad, Lahore, Pakistan)
The recent advancements in the field of nuclear medicine can be fairly attributed to the efficient methods for the production of the promising radionuclides in sufficient amounts with high purity. This work covers the theoretical aspects related to production of two potentially useful radionuclides; 110mIn (T½ = 69.1 min) and 193mPt (T½ = 4.33 d). Analysis of the excitation functions is...
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Todd Bredeweg
Fission product chain yields were historically determined by chemical separation and beta counting of fissile samples irradiated in carefully controlled fission chamber experiments$^{1,2}$. These measurements provided the means to extract absolute fission product yields (yield per fission, or $Y_i/f$ for the $i^{th}$ fission product) that are included in the international nuclear data...
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Peter Schillebeeckx (EC - JRC-Geel)
Characterisation of spent nuclear fuel (SNF) is required to ensure the safe operation of the different facilities involved in Spent Fuel management – for handling, storage, conditioning, reprocessing or final disposal – as well as for transport activities between those facilities. Several quantities are of importance: neutron and γ-ray emission rates and spectra, decay heat and the inventory...
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Augusto Hernandez Solis (SCK-CEN)
The China Experimental Fast Reactor (CEFR) is a 65 MWth pool-type sodium cooled fast reactor. The International Atomic Energy Agency (IAEA) launched a Coordinated Research Project (CRP) based on different released and available start-up tests of CEFR when it first reached criticality in 2010. Therefore, the main objectives of this CRP aim at improving fast reactor simulation analytical...
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Greg Bailey (UKAEA)
When a material or sample becomes activated $\beta$-emitting isotopes will often provide a significant contribution to nuclear responses. As such, accurate values for $\beta$-decay observables (decay energies, heating contributions) form an import part of decay data library development. Unfortunately, much of current evaluated $\beta$-decay data is incomplete.
During $\beta$-decay the...
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Ana-Paula Bernardes (CERN)
The contribution will detail the engineering design processes that made the n_TOF facility more versatile as well as the first hardware feed-back from the 2021 run and the 2022 hardware development plan. First experimental results from the 2021 irradiation will also be presented.
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Cristian Massimi, and the n_TOF Collaboration (https://ntof-exp.web.cern.ch/)
The charge independence of nuclear forces implies that in describing nuclear structure we do not have to distinguish between neutrons and protons. This symmetry is broken by electromagnetic interaction leading to a vast field of investigation aimed at clarifying the coupling between strong and electromagnetic forces. That is why, after so many decades since the first formulation of the nuclear...
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Christopher Brand
Fast, high-flux neutrons are an attractive source for imaging due to their ability to penetrate high-Z materials. Intense neutron sources also provide a powerful tool to measure neutron scattering cross sections needed to advance basic and applied nuclear science and engineering. However, intense continuous neutron sources are difficult to characterize due to the inapplicability of traditional...
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Dr Sylvain Leblond (CEA/LNHB)
For several decades, beta decay has been studied by researchers around the world in order to measure the characteristic parameters: Q-value, half-life, branching ratio, etc. While these studies have correctly characterized some of these parameters, the energy spectra of the emitted beta particles are less well known, in particular in the case of forbidden transitions. Over the past ten years,...
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Mark Kellett (CEA/LNE-LNHB)
The JEFF Radioactive Decay Data Library forms part of the suite of nuclear data libraries produced under the auspices of the Joint Evaluated Fission and Fusion (JEFF) file project of the OECD Nuclear Energy Agency. An update of the radioactive decay data library, JEFF-4, is now in progress.
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All the sources of radioactive decay data that contribute to this library are being updated,... -
Matthew Gooden
Under a joint collaboration between Los Alamos National Laboratory, Lawrence Livermore National Laboratory and the Triangle Universities Nuclear Laboratory, a set of absolute cumulative fission product yield measurements has been performed. The energy dependence of a number of cumulative fission product yields (FPY) have been measured using quasi-mono-energetic neutrons for three actinide...
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Paola Marini
Prompt neutron emission is a challenge in nuclear fission research. Accurate values of the number of prompt fission neutrons emitted in fission reaction and their kinetic energy distributions are essential for fundamental and applied nuclear physics. Indeed, they provide valuable information on the amount of excitation energy of the heated fissioning system transferred to the primary...
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Dr Alexey Stankovskiy (Belgian Nuclear Research Centre SCK CEN)
Preliminary assessment of the dose due to potential atmospheric release from MINERVA Proton Target Facility (PTF) being designed at SCK CEN has identified isotopes of Iodine (notably 125I, 126I and 131I) as major contributors [1]. Iodine is a volatile element and its retention in the structures is limited. Therefore, its production in the PTF actinide ISOL (Isotope Separation On-Line) targets...
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Dr Meghna Karkera (Department of Data Science, Manipal Academy of Higher Education 576104, Manipal, India)
In this paper, we present the interesting details of our attempts to create a basic evaluated nuclear data file for $^{232}$Th(n, 2n)$^{231}$Th reaction cross section, in the Indian context [1]. The work presented in this paper on nuclear data evaluation process includes performing our own Indian measurements of this
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nuclear reaction data with detailed covariance analysis and including them in... -
Ali Al-Adili
The neutron emission is an important fingerprint of the excitation-energy sharing in the nuclear fission process. Highly excited, neutron-rich nuclei release their energy by emitting prompt neutrons and γ-rays. Improved determination of particle-emission characteristics enhances the understanding of fission dynamics. The nuclear data libraries lack data which are crucial for various...
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Dr Viktor Zerkin (International Atomic Energy Agency)
EXFOR (EXchange FORmat) and NSR (Nuclear Science References) databases contain experimental nuclear reaction and comprehensive bibliography information since the beginning of nuclear science developed within the framework of the NRDC (Nuclear Reaction Data Centers) network and under the auspices of the USNDP (US Nuclear Data Program). The both databases include compilations of original...
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Raphaelle Ichou (IRSN)
Depletion codes such as VESTA 2.2 [1] are used to calculate the time evolution of a material subjected to radiation for a wide variety of applications in the fields of nuclear safety, radiation protection and environmental health safety. For these applications, experimental validation is paramount. VESTA 2.2, which allows coupling both MCNP6 [2] and/or MORET 5 [3] Monte Carlo codes to a...
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Roland Beyer
The inelastic scattering of fast neutrons from $^7$Li nuclei was investigated at the nELBE neutron-time-of-flight facility. This process has technological implications in fusion and fission reactors. In the former it could create an intense $\gamma$-ray field causing heating and radiation damage, in the latter it could strongly influence the neutron energy spectrum and therefore the...
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Dr Mitja Majerle (Nuclear Physics Institute of the CAS, Czechia)
The Nuclear Physics Institute of the Czech Academy of Sciences operates several fast neutron generators. The generators are based on the reaction of accelerated protons (U120M cyclotron, energy of protons up to 35 MeV) with the lithium and beryllium targets. The produced quasi-monoenergetic and continuous neutron spectra with energies up to 33 MeV have been well characterized.
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The neutron... -
Ivan Alexander Kodeli
Covariance mmatrices play an important role in nuclear reactor safety, dessign and cost optimisation studies. The availability of covariance matrix data in several recent cross section evaluations, such as ENDF/B-VIII, JEFF-3.3, JENDL-4 etc., has been considerably improved which demonstrates an increased awareness of the importance of these data among the nuclear community. The complete sets...
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Paraskevi Dimitriou (International Atomic Energy Agency), Dr Stéphane Goriely (ULB)
The global semi-macroscopic alpha-nucleus optical potential developed in 2002 [1] has been widely used in calculations of alpha-nucleus reactions, especially since it was implemented in the nuclear reaction code TALYS.
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The result of the widespread use of the global semi-microscopic alpha optical potential in calculations of reaction cross sections of medium- and heavy mass nuclei that have... -
Dr Iyad Al-Qasir (Department of Mechanical and Nuclear Engineering, University of Sharjah, Sharjah 27272, UAE)
For solid moderators, the incoherent approximation has been widely used to calculate thermal neutron scattering laws at different temperatures. The only input needed in the incoherent approximation is the phonon density of states. Traditionally, the phonon densities of states are calculated by fitting the interatomic force constants to experimental data, such as low-temperature inelastic...
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Henrik Sjöstrand (Uppsala Universitet)
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Dr Tim Ware (Jacobs)
The ANSWERS Software Service produces the MONK\textregistered and MCBEND Monte Carlo codes, and the WIMS deterministic code for nuclear criticality, shielding and reactor physics applications. MONK and MCBEND can utilise the BINGO continuous energy nuclear data library and MONK and WIMS can utilise the WIMS 172 energy group nuclear data library. Production of BINGO libraries currently utilises...
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Anatoly Kochetkov (SCK-CEN)
The need for accurate knowledge of neutron data in materials as Pb and Bi has increased recently due to the Accelerator Driven System (ADS) and new generation of fast reactor designs with lead or lead-bismuth coolant. The Belgian Nuclear Research Centre (SCK CEN) develops the Multi-purpose hYbrid Research Reactor for High-tech Applications (MYRRHA) that will have a fast sub-critical core...
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Olga Vilkhivskaya (UK Atomic Energy Authority)
Accurate simulations of the radionuclide inventories and measurable quantities such as activity, dose rates and decay heat are made possible by means of carefully evaluated decay data (DD). In an automated compilation of a DD library of more than 3800 nuclides, the DD files could notably suffer from: misreading of data from the sources, omitting of the emitted particle spectra during the...
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Dr Elizabeth Musacchio González (Laboratori Nazionali di Legnaro - Istituto Nazionale di Fisica Nucleare, (LNL-INFN), Italy)
In the Universe, the observed elements heavier than iron (Fe) are mostly produced by neutron-capture processes in the stars. These processes are defined as s (slow) and r (rapid) processes. The experimental measurement of the neutron capture cross sections is an actively working task, since it is an essential element in the stellar reaction rates calculations and thus, the possibility of...
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Vanessa Linero
The scarcity of independent yields for Pu-239 at fast neutron energies hinders the ability to properly generate a predictive model and requires additional measurements for proper simulations. Obtaining independent yields can be difficult, as the measurement of short-lived fission products places a time constraint on detection methods available. The use of a monoenergetic neutron beam and rapid...
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Adrian Sanchez Caballero, The n_TOF Collaboration
More accurate neutron capture cross-section data for $^{239}$Pu are required for the design of new critical nuclear systems such as Gen IV reactors and Accelerator Driven Systems (ADS) and for the operation of thermal reactors, especially when loaded with MOX fuels. Therefore, the capture cross-section of $^{239}$Pu is included in the NEA/OCDE High Priority Request List [1].
At present...
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Julien Cartier
In this paper, we present new cross sections measurements of the 197Au(n,2n)196Au and 89Y(n,2n)88Y reactions induced by ~14MeV neutrons. These new measurements are determined with a relative activation method.
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We irradiate foils targets of gold and yttrium with ~14MeV neutron flux produced using the SAMES neutron accelerator facility [1] at CEA of Valduc, through the d+t-> n14,7 MeV+α... -
Alexander Prokofiev (Uppsala University)
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Begona Fernandez Martinez
Neutron induced charged particle production reactions (n,chp) are of interest in different research fields, among others, astrophysics, nuclear technology and nuclear medicine. In this context, a viability study for measuring (n,chp) reactions at the HiSPANoS facility has been carried out. HiSPANoS, at the Centro Nacional de Aceleradores (CNA), is the only accelerator based neutron source in...
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Dr Hairui Guo (Institute of Applied Physics and Computational Mathematics)
Optical model is one of the most fundamental theoretical models in nuclear reaction theory. It is applied widely in various nuclear reaction calculations. The microscopic optical potential (MOP) is generated theoretically based on the nucleon-nucleon interaction, which has no free parameters and does not depend on experimental data. The MOPs for nucleon, 2,3H, 3,4,6He and 6,7Li are obtained in...
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Dr Tamas Belgya (Institute for Energy Security and Environmental Safety, Centre for Energy Research, Budapest, Hungary)
Reliable uncertainty estimation of both the unfolded experimental data and of the theoretical model is utmost to obtain adequate Chi-square estimation when fitting model parameters to the experimental gamma-ray spectra. To do that, preparation steps of experimental spectra had already been presented in Ref. [1] with complete uncertainty estimation. The obtained unfolded spectrum can then be...
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Jose Manuel Quesada
Nuclear reaction data are an essential component of Monte Carlo simulation of proton transport. These reactions have a significant influence on the simulated dose distributions (of interest, e.g., in proton therapy), mostly through the release of high-energy gamma rays and nuclear fragments, which contribute to the global particle fluence within the irradiated material. Conversely, Monte Carlo...
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Stephan Pomp (Uppsala University)
We have been developing the NEutron Source in uppSAla (NESSA) facility, placed in the FREIA hall, at Ångström laboratory of Uppsala University. The facility is taking up operations during spring 2022.
The compact neutron generator has been developed by Adelphi Technology, Inc. Using DT reactions, it provides 14 MeV neutrons with a yield of about 4 x 10^10 neutrons per second. The...
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Dr Axel Klix (Karlsruhe Institute of Technology)
The DEMO Oriented Neutron Source DONES is a neutron irradiation facility for experimental tests of DEMO reactor structural materials. It is intended to irradiate the materials at typically 5 - 20 dpa/fpy to damage dose levels of around 50 dpa over 3 years. The neutron fluence on the samples in the specimen
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capsules in the High-Flux Test Module (HFTM) is a fundamental parameter for... -
Liviu Stoica
A new 40Ca(n,n’γ)40Ca experiment has been performed at the European Commission - Joint Research Center (EC - JRC) Geel Electron LINear Accelerator (GELINA) facility in Belgium. This isotope is of importance for the nuclear energy industry due to fact that Generation IV Molten Salt Reactors (MSRs)will use, among other candidates, the LiF−CaF2melt. Considering that the neutron inelastic...
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Brian Frandsen
Neutron inelastic scattering cross-section data are limited for many isotopes, necessitating new and/or more accurate measurements to improve the data for radiation transport modeling and simulations for a wide variety of power, defense, and nonproliferation applications. The newly commissioned Gamma Energy Neutron Energy Spectrometer for Inelastic Scattering (GENESIS) capability at the...
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Cristian Massimi (INFN and University of Bologna)
The FOOT (FragmentatiOn Of Target) collaboration aims at improving the accuracy of treatment planning in hadron therapy by studying the behavior of the used particle beams. Typical beams of protons or carbon ions can interact with the nuclei constituting the human body, thus leading to nuclear fragmentation with significative neutron productions. While nuclear fragments are an important source...
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Clement Corneille (Université de Strasbourg)
Neutron is one of the most produced secondary particle by medical and industrial accelerators, but it remains difficult to detect due to its neutral charge. Neutrons also require a particular attention in radiation protection due to their long range and their high relative biological effectiveness (RBE) [1]. For instance, in hadron therapy, ion beams can generate multiple neutrons both in the...
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Dr Iyad Al-Qasir (Department of Mechanical and Nuclear Engineering, University of Sharjah, Sharjah 27272, UAE)
Graphite has been of significant scientific interest since the inauguration of nuclear technology, through the search for a high-purity grade to be used as a neutron moderator in Chicago-Pile 1, the first nuclear reactor. Currently, the Very High-Temperature Gas-Cooled Reactor is graphite-moderated and uses graphite as a significant structural component. Furthermore, nuclear graphite is a...
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Dimitri Rochman (Paul Scherrer Institute)
The characterization of Spent Nuclear Fuel (SNF) is a crucial step towards safe and
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economical designs of transport casks, disposal canisters, and interim or long-term
storage facilities. A number of quantities are at the heart of such characterization:
isotopic compositions, decay heat, gamma/neutron emission for the SNF themselves,
and criticality for specific SNF configurations. For these... -
Aaron Couture (Los Alamos National Laboratory)
The Detector for Advanced Neutron Capture Experiments (DANCE) is a
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4-$\pi$ BaF$_{2}$ array located at the Los Alamos Neutron Science
Center (LANSCE) dedicated to performing neutron capture experiments for
a wide range of applications from nuclear astrophysics to nuclear energy
to national security. The unique combination of high neutron flux, high efficiency, high segmentation, and moderate... -
Cristian Massimi
The neutron time-of-flight facility n_TOF at CERN has been producing relevant nuclear data for science and technology since 2001. In particular, neutron-induced cross sections have been reported on more than 100 reactions, so far. Among them, the $^{235}$U(n,f) cross section was deeply studied [1,2] in different energy regions and using several detector concepts, for instance Parallel Plate...
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Jean-Charles Thomas (GANIL)
Nuclei masses are crucial for the understanding of nuclear forces that give to the atomic nucleus its binding energy, are responsible for its structure and drive its evolution all over the nuclide chart. They are also mandatory to evaluate the reaction rates entering the modelling of explosive nucleosynthesis processes. In this context, the so-called Isobaric Multiplet Mass Equation (IMME)...
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Carlo Gustavino
Two striking anomalies have been observed recently in the emission of electron-positron pairs in $^7Li(p,e^+e^-)^8Be$ and $^3H(p,e^+e^-)^4He$ reactions [1-3]. These anomalies have been interpreted as the signature of a new particle, a boson with a mass of 17 MeV (hereafter X17 boson), not foreseen in the particle physics standard model. It has been speculated that the X17 boson could be a...
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Mark Paris (LANL T-2)
Resonance parametrizations of nuclear scattering and reaction observables are useful for applications in nuclear astrophysics, nuclear energy and nuclear safety and security. Such parametrizations derived from the phenomenological $R$-matrix -- a Green-function approach -- afford compact and accurate descriptions of the relevant observables and their uncertainties as determined by the observed...
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Tanja Stary
R-matrix theory is a unique tool to provide quantitatively reliable descriptions of resonant scattering and reaction processes in nuclear systems. Albeit it is not a microscopic theory and lacks predictive power the method is widely used for analyses of experimental reaction data because it satisfies major conservation rules thus leading to consistent descriptions of collision processes....
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Satoshi Chiba
There are numerous ways to treat theoretically nuclear fission, ranging from pure phenomenology, macro-micro method to purely microscopic ones. In this talk, we will concentrate on a macro-micro method in terms of the Langevin equations. In this method, time-evolution of the positions and momenta of shape degree of freedom is treated as a coupled first-order stochastic differential equations...
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Preston Awedisean (LBL/UCB)
The Fast Loading User Facility for Fission Yields (FLUFFY) has been used to measured short-lived fission yields on 238U and 239Pu via cyclical neutron activation analysis. Sub-second transport times allow FLUFFY to observe gamma-ray signatures from fission products with half-lives of less than one second. This ability makes it possible to report multiple independent fission product yields...
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Mr Dmitry Martyanov (Joint Institute for Power and Nuclear Research - Sosny)
The recently developed multiband dispersive optical model with soft rotator nuclear model couplings is used to build a regional potential for fissile actinides. The model allows coupled-channel calculations for odd-A targets considering rotational bands built on vibrational states. Those complex vibrational states are characterized by a coupling of single-particle excitations with the...
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Ms María Elena López Melero (Departamento de Física Atómica, Molecular y Nuclear. Universidad de Granada, Spain)
An important part of medical applications of ionizing radiation are included in nuclear medicine. This is based on the use of radioisotopes as radiation sources and allows the both medical diagnostic and treatment of the main diseases with the greatest social impact, such as cancer, cardiovascular problem and brain diseases [1]. The two main challenges to improve and develop new therapies...
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Anton Wallner
The detection of long-lived radionuclides through ultra-sensitive isotope ratio measurements via accelerator mass spectrometry (AMS) offers opportunities for precise measurements of neutron capture cross sections, e.g. for nuclear astrophysics. For specific reactions AMS provides a unique tool to pin down uncertainties which is important to address existing discrepancies. This approach...
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Carlo Gustavino
The LUNA collaboration has recently completed the measurement of the $D(p,γ)^3He$ cross section at Big Bang Nucleosynthesis (BBN) energies with unprecedented precision. The study of this deuterium-burning process provides a precise determination of the universal baryon density $\Omega_b$, in excellent agreement with the value derived from CMB. The new data also provide a stringent constrain...
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Dr Richard Firestone (Lawrence Berkeley National Laboratory)
The analysis of level densities and photon strengths has been bedeviled by misconceptions and physics errors that have persisted for over 50 years. In this talk I will discuss deficiencies in the Constant Temperature (CT) level density model as described by Gilbert and Cameron. This model describes the “total” level density using a nonphysical back shift parameter. I will show that every...
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Dr Xavier Mougeot (Université Paris-Saclay, CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91120 Palaiseau, France)
Over the past decade, forbidden non-unique beta transitions have been identified to be of critical importance in several fundamental physics topics, such as the modelling of antineutrino flux from nuclear reactors or from the Earth, and the background modelling in dark matter experiments. The decay half-lives of long-lived beta-emitting radionuclides, which exhibit a high degree of...
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Johannes Ekman (Uppsala University, Sweden)
A characterisation of spent nuclear fuel (SNF) is essential for a safe, secure, ecologic and economic handling, transport, interim storage and final disposal of SNF assemblies. Several quantities are of importance: neutron and γ-ray emission rates and spectra, decay heat and the inventory of fissile nuclides. These sources can only be obtained by theoretical calculations. Evidently, the...
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Prof. Helmut Leeb (TU Wien, Atominstitut)
Evaluated nuclear data files are expected to provide consistent data sets which represent the best knowledge of reaction observables of a specific group of nuclei. They are essential prerequisites for the development of novel technologies, such as fusion research, but also yield important input for several fields of science such as nuclear medicine, astrophysics, radiation safety, space...
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Javier Balibrea-Correa, the n_TOF Collaboration
Neutron capture cross-sections are an essential ingredient for many research fields, particularly for nuclear reactor technologies and astrophysical studies. Therefore, a big effort is being made worldwide with the aim of improving neutron-beam facilities, detection systems and sample production techniques with the goal of getting new or more accurate nuclear data.
However, ineluctable...
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Prof. Cristiana Oprea (JINR)
Nuclear reactions induced by fast neutrons starting from 0.5 MeV up to 25 MeV with emission of alpha particles were investigated. Cross-sections and their uncertainties, angular correlations, and forward-backward asymmetry effects were evaluated with Talys, SPSS, and the author’s own computer codes. Contribution to the cross-section of nuclear reaction mechanisms like direct, compound, and...
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Prof. Cristiana Oprea (JINR)
Transmission coefficients were evaluated applying a quantum-mechanical approach starting from the reflection factor. Reflection factor is a complex function depending on logarithmic derivative, ingoing and outgoing wave functions (as solutions of Schrodinger equation), and parameter of nuclear potentials. Transmission coefficients, for charged and neutral particles, were calculated considering...
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