Under a joint collaboration between TUNL-LANL-LLNL, a set of absolute fission product yield measurements has been performed. The energy dependence of a number of cumulative fission product yields (FPY) have been measured using quasi-monoenergetic neutron beams for three actinide targets, 235U, 238U and 239Pu, between 0.5 and 14.8 MeV. This work has been done with the Triangle Universities Nuclear Laboratory (TUNL) 10 MV Tandem Van De Graaf accelerator on the campus of Duke University. In a quest to provide the most complete set of fission product yield data, we have measured the cumulative fission product yields for approximately 15 peak yield fission products as a function of incident neutron energy. Using a newly built rapid-transfer system, we are extending our previous measurements to consider the independent/cumulative yields of another dozen or more short-lived fission products with half-lives on the order of seconds-to-minutes. These new data, combined with our previously measured fission yields, will provide significant data and constraints to fission theory. To this point, theoretical modeling of fission has data sets of fission yields limited to thermal, fission and 14 MeV neutron energies, our new data will now provide theory an evolution of the fission yields over a wide energy range.

Energy dependence of fission product yields for 235U, 238U, and 239Pu with monoenergetic neutrons between thermal and 14.8 MeV

2019 Fall National Meeting

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