Fission product chain yields measured using the fission spectrum critical assemblies at the National Criticality Experiments Research Center (NCERC) at the Nevada National Security Site (NNSS) are presented.  Irradiations of 93% enriched <sup>235</sup>U (HEU) and depleted <sup>238</sup>U (DU) targets were performed on both the COMET/ZEUS and Flattop assemblies. The fission products were elementally separated by radiochemistry, and measured using high-precision beta counting.  The observed fission product chain yields show that several of the isotopic species vary with the effective energy inducing fission in the assemblies.  The observed fission product chain yields are consistent with historical measurements, and support the two-mode fission hypothesis of Ford and Norris.

Fission product chain yields from fission spectrum irradiations at NCERC

249th National Meeting (2015)

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