Recent improvements in the calculation of prompt fission neutron spectra: Preliminary results

Three tropics have been considered in the refinement and improvement of our original calculations of prompt fission neutron spectra. These are an improved calculation of the prompt fission neutron spectrum N(E) from the spontaneous fission of /sup 252/Cf, a complete calculation of the prompt fission neutron spectrum matrix N(E,E/sub n/) from the neutron-induced fission of /sup 235/U, at incident neutron energies ranging from 0 to 15 MeV, and an assessment of the scission neutron component of the prompt fission neutron spectrum. Preliminary results will be presented and compared with experimental measurements and an evaluation. A suggestion has been made for new integral cross-section measurements.