Investigation of phenomenological models for the Monte Carlo simulation of the prompt fission neutron and γ emission

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 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 Cf-252(sf) experimental data on prompt fission neutron multiplicity (nu) over bar (A), (nu) over bar (TKE), the neutron multiplicity distribution P(nu), as well as their energy spectra N(E), and lastly the energy release in fission.