Abstract
We have applied the Hauser-Feshbach statistical theory, in a Monte-Carlo im- plementation, to the de-excitation of fission fragments, obtaining a reasonable descrip- tion of the characteristics of neutrons and gamma rays emitted before beta decays toward stability. Originally implemented for the spontaneous fission of 252 Cf and the neutron- induced fission of 235 U and 239 Pu at thermal neutron energy, in this contribution we dis- cuss the extension of the formalism to incident neutron energies up to 20 MeV. For the emission of pre-fission neutrons, at incident energies beyond second-chance fission, we take into account both the pre-equilibrium and statistical pre-fission components. Phe- nomenological parameterizations of mass, charge and TKE yields are used to obtain the initial conditions for the fission fragments that subsequently decay via neutron and γ emissions. We illustrate this approach for 239 Pu(n,f).
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