Year: 2026
Type: article
Abstract: Recent microscopic studies have investigated various features of the spin distributions of fission fragments, but their parity distributions remain largely unexplored. In this Letter, we provide a complete characterization of the spin--parity content of fission fragments within a time-dependent Hartree-Fock-Bogoliubov framework, performing for the first time simultaneous projections on angular momentum, particle number, and parity. Calculations are carried out for the thermal neutron-induced fission of $^{239}$Pu using both the Gogny and Skyrme energy density functionals. We find that dynamical pair breaking during fission populates a significant fraction of unnatural-parity states and generates components with non-zero spin projections $K$. The parity content is found to depend on the number parity of the fragments, with odd-mass nuclei exhibiting pronounced parity staggering and odd-odd nuclei favoring negative parity. These results show that the parity distribution of fragments can depart significantly from the equiprobable partition commonly assumed in statistical de-excitation models, with potential implications for the modeling of fragment decay.
Source: Physical Review C
DOI: 10.1103/xr21-trz3
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: U.S. Department of Energy, European Commission, Centre National de la Recherche Scientifique, Grand Équipement National De Calcul Intensif, Office of Science, HORIZON EUROPE Framework Programme, Institut National de Physique Nucléaire et de Physique des Particules, Advanced Scientific Computing Research, Nuclear Physics, Lawrence Livermore National Laboratory
OpenAlex ID: W7171498052