Monte Carlo approach to sequential neutron emission from fission fragments

We have implemented a Monte Carlo simulation of fission fragment statistical decay by sequential neutron emission. Within this approach, we calculate the center-of-mass and laboratory prompt neutron energy spectra as a function of the mass of fission fragments and integrated over the whole mass distribution. We also assess the prompt neutron multiplicity distribution P({nu}), both the average number of emitted neutrons and the average neutron energy as a function of the mass of the fission fragments [respectively {nu}(A) and (A)]. We investigate the average total energy available for prompt {gamma}-ray emission as a function of the mass of the fission fragments E{sub {gamma}}(A). We also calculate neutron-neutron correlations such as the full matrix {nu}(A,TKE) as well as correlations between neutron energies. Two assumptions for partitioning the total available excitation energy among the light and heavy fragments are considered. Results are reported for the neutron-induced fission of {sup 235}U (at neutron energy of 0.53 MeV) and for the spontaneous fission of {sup 252}Cf.