Consideration of memory of spin and parity in the fissioning compound nucleus by applying the Hauser-Feshbach fission fragment decay model to photonuclear reactions

• DOI: 10.1103/physrevc.107.044608
• Publication Date: 2023-04-17T14:01:51Z
• Authors: T. Kawano; A. E. Lovell; S. Okumura; H. Sasaki; I. Stetcu; P. Talou
• Keywords: Nuclear Theory (nucl-th); Nuclear Theory; 0103 physical sciences; FOS: Physical sciences; 7. Clean energy; 01 natural sciences

Prompt and $β$-delayed fission observables, such as the average number of prompt and delayed neutrons, the independent and cumulative fission product yields, and the prompt $γ$-ray energy spectra for the photonuclear reactions on $^{235,238}$U and $^{239}$Pu are calculated with the Hauser-Feshbach Fission Fragment Decay (HF$^3$D) model and compared with available experimental data. In the analysis of neutron-induced fission reactions to the case of photo-induced fission, an excellent reproduction of the delayed neutron yields supports a traditional assumption that the photo-fission might be similar to the neutron-induced fission at the same excitation energies regardless of the spin and parity of the fissioning systems.