Event-by-event evaluation of the prompt fission neutron spectrum from239Pu(n,f)
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Abstract
Earlier studies of ${}^{239}$Pu($n,f$) have been extended to incident neutron energies up to 20 MeV within the framework of the event-by-event fission model $\mathtt{FREYA}$, into which we have incorporated multichance fission and pre-equilibrium neutron emission. The main parameters controlling prompt fission neutron evaporation have been identified and the prompt fission neutron spectrum has been analyzed by fitting those parameters to the average neutron multiplicity $\overline{\ensuremath{\nu}}$ from ENDF-B/VII.0, including the energy-energy correlations in the covariance of $\overline{\ensuremath{\nu}}(E)$ obtained by fitting to the experimental $\overline{\ensuremath{\nu}}$ data used in the ENDF-B/VII.0 evaluation. We present our results, discuss relevant tests of this new evaluation, and describe possible further improvements.
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