Speaker
Description
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 in fission is of particular interest: Only the microscopic structure of the nuclei can explain the asymmetric distribution of fission fragments produced from neutron-rich actinides. Nuclear structure depends on the number of protons and neutrons separately. This strengthens the need of an experimental complete identification of fission fragments.
In addition, the concept and development of future IV-generation nuclear reactors require a complete nuclear data base for incoming neutron energies up to several of MeV~\cite{NEA,Pro,ENDF}. Therefore, from the application point of view, there is also a need of data concerning the fission production from actinides induced by fast neutrons.
A new setup based on two position-sensitive Secondary Electrons Detectors and an Axial Ionization Chamber, the FALSTAFF spectrometer, has been built in order to measure both, the mass and the nuclear charge of the full distribution of fission products from fast-neutron induced fission in actinides~\cite{fal1,fal2}.
The FALSTAFF spectrometer will be used in combination with the VAMOS++ magnetic spectrometer early in 2022 at GANIL (France), in order to measure both fragments at the same time from fusion-fission reactions in inverse kinematics. This will allow to better understand the response of FALSTAFF. Later, it will benefit from the high neutron flux from the new Neutrons For Science Facility at GANIL-SPIRAL2 to perform fast neutron-induced fission studies. Preliminary results from the first measurement will be presented as well as the prospectives of the following experiments. The strength of the FALSTAFF setup for complete fission-fragment identification will be discussed.
\begin{thebibliography}{00}
\bibitem{Bohr} N. Bohr and J.A. Wheeler, Phys. Rev. 56, 426 (1939).
\bibitem{wil76} B.D. Wilkins, E.P. Steinberg, and R.R. Chasman, Phys. Rev. C 14, 1832 (1976).
\bibitem{bro90} U. Brosa, S. Grossman, and A. M\"{u}ller, Phys. Reports 197, 167 (1990).
\bibitem{sorting} K.-H. Schmidt and B. Jurado, Phys. Rev. Lett. 104, 212501 (2010).
\bibitem{scamps18} G. Scamps and C. Simenel, Nature 564, 382 (2018).
\bibitem{kh18} K.-H. Schmidt and B. Jurado, Rep. Prog. Phys. 81, 106301 (2018).
\bibitem{NEA} Accelerator-driven systems (ADS) and fast reactors (FR) in advanced nuclear fuel cycles, OECD Nuclear Energy Agency Report No. 3109 (2002).
\bibitem{Pro} Proceedings of the International Workshop, Antwerpen, Belgium, April 2005, https://doi.org/10.1142/6130
\bibitem{ENDF} D. Brown, et al., ENDF/B-VIII, Nucl. Data Sheets 148, 1 (2018).
\bibitem{fal1} D. Doré, et al., Nuclear Data Sheets 119, 346 (2014)
\bibitem{fal2} D. Doré, et al., EPJ Web Of Conf. 211, 04002 (2019).