Time Evolution of Prompt Gamma-Ray Emission in $^{252}$Cf(sf) and $^{233,235}$U($n$,f) Reactions
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2025
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| author | Talou, Patrick Lovell, Amy E. Stetcu, Ionel Rusev, Gencho Kawano, Toshihiko Jandel, Marian |
| author_facet | Talou, Patrick Lovell, Amy E. Stetcu, Ionel Rusev, Gencho Kawano, Toshihiko Jandel, Marian |
| contents | We investigate the time evolution of prompt fission $γ$ emission due to the presence of ns to ms isomers in the fragments produced in the neutron-induced fission of $^{233,235}$U and in the spontaneous fission of $^{252}$Cf. Calculations performed with the CGMF fission event generator are compared with recent experimental data on $^{252}$Cf(sf) and $^{235}$U($n$,f) obtained with the DANCE+NEUANCE setup at the Los Alamos Neutron Science Center. Of particular interest are the average $γ$-ray energy spectrum as a function of time since scission, $ϕ(ε_γ,t)$, the increase of the average $γ$-ray multiplicity over time, $N_γ(t)$, and its evolution in time as a function of the fission fragment mass, $N_γ(A,t)$. The time evolution of isomeric ratios in post-neutron emission fission fragments can be defined and used to test and reveal some deficiencies in our knowledge of the low-lying levels of neutron-rich nuclei produced in fission reactions. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_00599 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Time Evolution of Prompt Gamma-Ray Emission in $^{252}$Cf(sf) and $^{233,235}$U($n$,f) Reactions Talou, Patrick Lovell, Amy E. Stetcu, Ionel Rusev, Gencho Kawano, Toshihiko Jandel, Marian Nuclear Theory We investigate the time evolution of prompt fission $γ$ emission due to the presence of ns to ms isomers in the fragments produced in the neutron-induced fission of $^{233,235}$U and in the spontaneous fission of $^{252}$Cf. Calculations performed with the CGMF fission event generator are compared with recent experimental data on $^{252}$Cf(sf) and $^{235}$U($n$,f) obtained with the DANCE+NEUANCE setup at the Los Alamos Neutron Science Center. Of particular interest are the average $γ$-ray energy spectrum as a function of time since scission, $ϕ(ε_γ,t)$, the increase of the average $γ$-ray multiplicity over time, $N_γ(t)$, and its evolution in time as a function of the fission fragment mass, $N_γ(A,t)$. The time evolution of isomeric ratios in post-neutron emission fission fragments can be defined and used to test and reveal some deficiencies in our knowledge of the low-lying levels of neutron-rich nuclei produced in fission reactions. |
| title | Time Evolution of Prompt Gamma-Ray Emission in $^{252}$Cf(sf) and $^{233,235}$U($n$,f) Reactions |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2502.00599 |