Calculation of prompt fission neutron spectra for applied purposes

An extended version of the generalized Madland-Nix model is used to calculate the energy spectrum of fission neutrons as well as multi-differential emission probabilities (energy and angular distributions for different fragment mass numbers A). Besides the consideration of the compound-nucleus formation cross-section and the model dependence on A we introduce the center-of-mass system (CMS) anisotropy of neutron emission and a definite lower limit of the temperature distribution to account for the influence of neutron-gamma competition roughly. Fission energetics are studied in the framework of a simple two-spheroid model including shell correction energy. This treatment can be used to deduce necessary fragment data for any fission reaction semi-empirically. The new fission neutron spectrum model is applied to the spontaneous fission of 252Cf. (author)