Comprehensive modeling of prompt fission neutrons and γ rays in the spontaneous fission of ²⁵²Cf

Abstract

Abstract. We present a comprehensive set of calculations performed with the Monte Carlo Hauser-Feshbach code CGMF of the prompt fission neutrons and γ rays emitted in the spontaneous fission of Cf-252. This reaction has been studied in depth over the years and provides an almost perfect test for the assumptions, parameters and output of the CGMF code. Here we present results for prompt neutron observables beyond the ubiquitous average prompt fission neutron spectrum and multiplicity. In particular, we compare CGMF calculations to experimental data on neutron data per fragment mass split, neutron-light fragment and neutron-neutron angular distributions, and on the time dependence of the average prompt γ -ray multiplicity. Finally, we briefly discuss the recent integration of CGMF into the MCNP6.2 transport code.

Energy-dependent characteristics of prompt neutron anisotropic emission by 244Cm and 240Pu according to Monte Carlo simulations

“…However, further investigation is needed to confirm the practical applicability of asymmetry analysis. One significant fact in this regard is that asymmetry is variable according to the applied neutron energy threshold [16,17]. This inevitably causes complexity in asymmetry analysis, because prompt neutron measurement is principally based on fast neutron detection for which an energy threshold is needed due to high gamma sensitivity.…”