Abstract
This paper reports on a phenomenological scission point model including temperature-dependent shell effects that is used to solve the energy partition problem as a function of mass asymmetry (A{sub 1}/A{sub 2}) for plutonium fission. Relevant fragment data such as average excitation energy {bar E}*(A) and total kinetic energy {ovr TKE}(A{sub 1}/A{sub 2}) are used as the basis for applying a temperature distribution model based on the Modland-Nix theory that includes the full mass number dependence of spectra, a realistic temperature distribution of fragments, a modified center-of-mass (CMS) spectrum ansatz, CMS anisotropy of neutron emission, and competition of neutron and gamma-ray emission. The new model describes neutron multiplicity energy, and angular distribution of prompt fission neutrons. Calculated data for {sup 238}Pu, {sup 240}Pu, and {sup 242}Pu spontaneous fission are presented and discussed in comparison with experimental data.
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