Monte Carlo Hauser-Feshbach predictions of prompt fissionγrays: Application tonth+235U,nth+239Pu, and252Cf (sf)

Abstract

The prompt neutron and $\ensuremath{\gamma}$ emission from primary fission fragments are calculated for thermal neutron induced fission of ${}^{235}$U and ${}^{239}$Pu and for spontaneous fission of ${}^{252}$Cf using a Monte Carlo Hauser-Feshbach approach for the evaporation of the excited fission fragments. Remaining free model parameters, such as excitation energy sharing and initial spin distribution, are determined by comparison of the neutron emission characteristics with experimental data. Using the obtained parameters the $\ensuremath{\gamma}$-ray characteristics, e.g., $\ensuremath{\gamma}$ spectrum, multiplicity distribution, average multiplicity and energy, and multiplicity distribution, are calculated and compared with available experimental data.