Monte Carlo Simulation of Prompt Fission Gamma Emission

Prompt fission gamma spectra and multiplicities are investigated through the Monte Carlo code FIFRELIN which has been developed recently [1], . Up to now, this code was mainly used to study the characteristics (spectrum and multiplicity) of the prompt neutrons emitted from excited Fission Fragments (FF). When prompt neutron emission is over, the remaining available excitation energy of the FF is assumed to be dissipated as prompt gamma emission. An algorithm, similar to the one used by F. Becvar [2], to treat gamma cascades, has been implemented into the code. It is based on the known discrete levels of the excited fragments as well as on the theoretical models needed to calculate level densities and strength functions. All nuclear structure data are provided by the RIPL3.0 library [3]. Preliminary results relative to gamma deexcitation spectrum and multiplicity for single nuclei are presented. A total gamma spectrum for 252Cf spontaneous fission is also emphasized. Influence of the several methods, models and assumptions on the calculated fission gamma spectra is discussed as well as the prospective for such a simulation.