| Issue |
EPJ Web of Conf.
Volume 294, 2024
WONDER-2023 - 6th International Workshop On Nuclear Data Evaluation for Reactor applications
|
|
|---|---|---|
| Article Number | 02003 | |
| Number of page(s) | 8 | |
| Section | Nuclear Fission, Including Prompt Particle Emission and Fission Yields | |
| DOI | https://doi.org/10.1051/epjconf/202429402003 | |
| Published online | 17 April 2024 | |
https://doi.org/10.1051/epjconf/202429402003
Investigation of the structure in 235U(nth,fis) prompt gamma energy spectrum by FIFRELIN
1 Japan Atomic Energy Agency, 2-4, Shirakata, Tokai, Naka, Ibaraki 319-1195, Japan
2 Université Paris-Saclay, CEA, Service d’Etudes des Réacteurs et de Mathématiques Appliquées, 91191 Gif-sur-Yvette, France
3 Commissariat à l’énergie atomique et aux énergies alternatives, DES, IRESNE, DER, Cadarache, 13108 Saint-Paul-Lez-Durance, France
* e-mail: ogawa.tatsuhiko@jaea.go.jp
Published online: 17 April 2024
The energy spectrum of prompt gamma-rays from 235U thermal fission is reproduced by a fission reaction model FIFRELIN to identify the origin of spectral features. This spectrum is characterized by a bump at 4-4.5 MeV, a shoulder at around 8 MeV, and a tail above 10 MeV, which are attributed to 132Sn and 133Sb, fission fragments with mass from 130 to 134, and those with mass from 99 to 104, charge from 40 to 42, and spin from 12 ℏto 16 ℏ, respectively. Among prompt gamma-rays, high-energy part is important to get insight into scission, because the quanta are emitted by highly excited fission fragments, which still keep the memory of the scission configuration.
Our analysis suggests that coincidence detection of high energy gamma-rays and their source fission fragments identifying their isotopic species, spin and excitation energy with particular focus on those with mass number less than 104 will be useful to make conclusions about the origin of high energy gamma-rays.
© The Authors, published by EDP Sciences, 2024
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