https://doi.org/10.1140/epja/s10050-024-01232-7
Regular Article - Theoretical Physics
Prompt emission calculations for 239Pu(nth,f) with the DSE model code and a pre-neutron fragment distribution Y(A,TKE) based on the four-dimensional Langevin model
1
Universiy of Bucharest, Faculty of Physics, POB MG-11, str.Atomistilor 405, Magurele, Ro-77125, Bucharest, Romania
2
Nuclear Engineering Course, Department of Trans-disciplinary Science and Technology, School of
Environment and Society, Tokyo Institute of Technology, 2-12-1 Ookayama, 152-8550, Meguro, Tokyo, Japan
3
NAT Research Center, NAT Corporation, 3129-45 Hibara, Muramatsu, Tokai-Mura, 319-1112, Naka-Gun, Ibaraki, Japan
4
Tokyo Institute of Technology, 2-12-1 Ookayama, 152-8550, Meguro, Tokyo, Japan
a anabellatudora@hotmail.com, anabella.tudora@fizica.unibuc.ro
Received:
3
November
2023
Accepted:
22
December
2023
Published online:
5
February
2024
The request for new and/or more accurate data of independent fission product yields (FPY) and other distributions of pre- and post-neutron fragments constitutes a priority on an international level. The prompt emission model codes nowadays employed are refined enough to answer this request with the condition of using reliable distributions Y(A,TKE) of pre-neutron fragments. Up to now in the majority of cases such distributions were determined by experimental data. Y(A,TKE) from theoretical calculations can extend the use of prompt emission model codes to fissioning systems for which the experimental information is very scarce or completely missing. Such Y(A,TKE), recently obtained from four-dimensional Langevin model calculations in the frame of multi-modal fission, is tested by its use (as input) in the deterministic prompt emission model code DSE, for the case of 239Pu(nth,f). The obtained prompt emission results (e.g. prompt neutron multiplicity distributions ν(A), ν(TKE)) succeed to describe the experimental data and the independent FPY agree with the experimental data, too. Although visible differences between these results and those obtained with a an experimental Y(A,TKE) distribution exist. The present investigations have also emphasized other interesting aspects, e.g. concerning the pre-neutron fragments which contribute to the pronounced peaks and dips in the structure of both the mass yield Y(Ap) and the isotonic yield Y(Np) of post-neutron fragments, in connection with the role played by the even–odd effect in fragment charge, as well as how the position and magnitude of pronounced peaks and dips are influenced by the Y(A,TKE) distribution. Independent FPY separately for each number “n” of emission sequences leading to the last residual fragment Y(Ap = A-n), reported for the first time, have shown how and which of these components contribute to the structure of total Y(Ap). The crucial role of the energy partition in fission is revealed again by showing that a good choice of the RT parameterization can lead to very close results to those obtained with a TXE partition based on modeling at scission. On the contrary the use of an unique RT value for all fragmentations can alter -in some fission cases—the sawtooth shape of ν(A) and its agreement with experimental data, despite the refinement of the prompt emission treatment itself and of a reliable Y(A,TKE) distribution employed in calculations.
Copyright comment Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
