Preliminary Results of a Full Hauser-feshbach Simulation of the Prompt Neutron and Gamma Emission from Fission Fragments☆

摘要: Abstract The prompt neutron and gamma emission from fission fragments are investigated through the Monte Carlo code FIFRELIN which is developed at CEA Cadarache research center. In a previous release of code, de-excitation was treated in two steps process. First all neutrons simulated using Weisskopf spectrum for distribution their kinetic energy. second step, excitation energy still available dissipated by as an electromagnetic decay cascade. This paper presents new procedure fragment Hauser-Feshbach treatment particles emission. neutron/gamma competition then accounted during whole Moreover, now ruled transmission coefficients directly coming optical model calculation performed with TALYS-1.4. implementation these models quickly highlighted. results terms multiplicities spectra one simulation 252Cf spontaneous emphasized. multiplicity experimental data used to constraint parameters our simulation. calculated consistent structures observed experimentally low range well reproduced. However, same several different nuclear reveals high variation observables. For example, average total ( E γ,tot ) shown vary up 20% changes level density or radiative strength function model.