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Earlier studies of 239Pu(n, f) have been extended to incident neutronenergies up to 20 MeV within the framework of the event-by-event fission modelFREYA, into which we have incorporated multichance fission and pre-equilibriumneutron emission. The main parameters controlling prompt fission neutronevaporation have been identified and the prompt fission neutron spectrum hasbeen analyzed by fitting those parameters to the average neutron multiplicitynubar from ENDF-B/VII.0, including the energy-energy correlations in nubar(E)obtained by fitting to the experimental nubar data used in the ENDF-B/VII.0evaluation. We present our results, discuss relevant tests of this newevaluation, and describe possible further improvements.

Event-by-event evaluation of the prompt fission neutron spectrum from 239Pu(n, f)