Investigation of phenomenological models for the Monte Carlo simulation of the prompt fission neutron andγemission

Abstract

A Monte Carlo simulation of the fission fragment deexcitation process was developed in order to analyze and predict postfission-related nuclear data which are of crucial importance for basic and applied nuclear physics. The basic ideas of such a simulation were already developed in the past. In the present work, a refined model is proposed in order to make a reliable description of the distributions related to fission fragments as well as to prompt neutron and $\ensuremath{\gamma}$ energies and multiplicities. This refined model is mainly based on a mass-dependent temperature ratio law used for the initial excitation energy partition of the fission fragments and a spin-dependent excitation energy limit for neutron emission. These phenomenological improvements allow us to reproduce with a good agreement the $^{252}\mathrm{Cf}$(sf) experimental data on prompt fission neutron multiplicity $\overline{\ensuremath{\nu}}(A)$, $\overline{\ensuremath{\nu}}(TKE)$, the neutron multiplicity distribution $P(\ensuremath{\nu}),$ as well as their energy spectra $N(E)$, and lastly the energy release in fission.