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.
Highlights
The study of prompt fission neutrons and γ rays has seen a resurgence in the last few years due in part to the development of event-by-event fission fragment evaporation codes [1,2,3,4] and to the design of experiments aimed at measuring correlations between those particles
While nuclear data evaluations have been mostly confined to the estimation of an average prompt fission neutron spectrum (PFNS) χ, average prompt fission neutron multiplicity (PFNM) ν, and, for a few nuclei, the same quantities for the γ rays, these new tools can provide significantly more data, thereby placing indirect constraints on the evaluated data themselves
We provide here a very brief description of the models used, and more information can be found in CGMF User a e-mail: talou@lanl.gov
Summary
The study of prompt fission neutrons and γ rays has seen a resurgence in the last few years due in part to the development of event-by-event fission fragment evaporation codes [1,2,3,4] and to the design of experiments aimed at measuring correlations between those particles. While nuclear data evaluations have been mostly confined to the estimation of an average prompt fission neutron spectrum (PFNS) χ , average prompt fission neutron multiplicity (PFNM) ν, and, for a few nuclei, the same quantities for the γ rays, these new tools can provide significantly more data, thereby placing indirect constraints on the evaluated data themselves. The vast amount of experimental data available for 252Cf (sf) provides a very stringent test for some of the model assumptions made in statistical evaporation codes. This is the object of this short paper
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
