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

D. A. Brown; J. Randrup; M. A. Descalle; R. Vogt; W. E. Ormand

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

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arxiv 1105.4655 v1 pith:FAYCYFHU submitted 2011-05-23 nucl-th

R. Vogt , J. Randrup , D. A. Brown , M. A. Descalle , W. E. Ormand This is my paper · ORCID

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keywords neutronfissionbeenevaluationnubarpromptendf-bevent-by-event

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Earlier studies of 239Pu(n, f) have been extended to incident neutron energies up to 20 MeV within the framework of the event-by-event fission model 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 nubar 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.0 evaluation. We present our results, discuss relevant tests of this new evaluation, and describe possible further improvements.

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Improving the Predictive Capability of the Fission Reaction Event Yield Algorithm ($\mathtt{FREYA}$)
nucl-th 2026-06 unverdicted novelty 3.0 of 10

The authors optimize FREYA model parameters for thermal neutron-induced fission of 233,235U and 239,241Pu via genetic algorithm and test predictions on held-out observables.

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