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

Abstract

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.

20 pages, 26 figures

References in corpus (4)

• Microscopic approach of fission dynamics applied to fragment kinetic energy and mass distributions in 238U
• Structure properties of ${}^{226}$Th and ${}^{256,258,260}$Fm fission fragments: mean field analysis with the Gogny force
• Calculation of fission observables through event-by-event simulation
• Event-by-event study of prompt neutrons from 239Pu(n,f)

Cited by in corpus (7)

• Review on the progress in nuclear fission
• Description of Induced Nuclear Fission with Skyrme Energy Functionals: I. Static Potential Energy Surfaces and Fission Fragment Properties
• Theory of Nuclear Fission
• Correlated Prompt Fission Data in Transport Simulations
• Fission fragments intrinsic spins and their correlations
• Improved modeling of photon observables with FREYA
• Parameter Optimization and Uncertainty Analysis of FREYA for Spontaneous Fission