Abstract
The decay of fission fragments is studied throughMonte Carlo Hauser-Feshbach model calculations taking into account the competition between the emissions of prompt fission neutrons and gamma rays. The importance of initial excitation energy and spin distribution in the primary light and heavy fragments is demonstrated through comparison with experimental data. Excitation energy sorting mechanisms at scission are discussed in the light of these advanced simulations. Preliminary results on prompt fission gamma rays are also reported.
Highlights
Prompt fission neutrons and gamma rays constitute the first signature of post-scission physics
For 500 keV incident neutrons, the calculated result obtained by assuming similar initial fission fragment yields and adding 0.5 MeV to the total excitation energy was 2.932 to compare with 2.939 in the ENDF/B-VII.0 evaluation
We have presented for the first time results of Monte Carlo Hauser-Feshbach simulations of the decay of excited primary fission fragments
Summary
Prompt fission neutrons and gamma rays constitute the first signature of post-scission physics. Monte Carlo simulations of the fission fragment evaporation stage have been carried out by several groups [1,2,3,4] They all share the same techniques based on a Weisskopf evaporation spectrum for the emission of prompt neutrons. We discuss the use of Monte Carlo Hauser-Feshbach (MCHF) simulations to study the emission of prompt neutrons and gamma rays from excited primary fission fragments. In particular the initial spin distribution in the fission fragments has to be known to a certain accuracy, as it impacts the competition between neutrons and gamma rays significantly Special emphasis is placed on the distinction between MCHF and Weisskopf-based results and on the role played by the initial spin distribution in the primary fragments
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