Conveners
Formats: I
- Mike Herman (LANL)
Formats: II + Evaluation Methodology I
- Amanda Lewis
Formats: Evaluation Methodology II
- Dorothea Wiarda (ORNL)
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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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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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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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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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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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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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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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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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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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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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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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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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Jesse Brown (ORNL)26/07/2022, 12:03
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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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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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