[2G08-13] Fission Reaction

[2G09] Calculation of independent fission product yield and fission spectrum with the statistical decay theory

(2)Prompt fission neutron spectrum

*Toshihiko Kawano¹, Shin Okumura², Satoshi Chiba² (1. LANL, 2. Tokyo Institute of Technology)

Keywords:nuclear fission, prompt fission neutron spectrum

We applied the Hauser-Feshbach statistical decay theory to the excited fission fragments formed just after fission to calculate the fission product yield, and the prompt fission neutron and gamma-ray spectra. We included a large number of fission fragment pairs produced in the thermal neutron induced reaction on ²³⁵U. The prompt neutron kinetic energy was converted into the laboratory-frame and aggregated. The prompt fission neutron spectrum thus obtained is consistent with the calculated independent fission product yield.