Monte Carlo approach to sequential γ-ray emission from fission fragments

A Monte Carlo simulation of the fission fragment statistical decay based on a sequential neutron followed by {γ}-ray emission is proposed. The {γ}-ray energy spectrum is calculated as a function of the mass of the fission fragments and integrated over the whole mass distribution. The prompt {γ}-ray multiplicity distribution, both the average number of emitted {γ} rays and the average {γ}-ray energy as a function of the mass of the fission fragments [respectively, N̄_γ(A) and ε_γ(A)], are also assessed. The {γ}-{γ} correlations emitted from both light and heavy fragments are calculated as well as correlations between {γ}-ray energies. Results are reported for the neutron-induced fission of ²³⁵U (at 0.53 MeV neutron energy) and for the spontaneous fission of ²⁵²Cf.