Journal
NUCLEAR DATA SHEETS
Volume 173, Issue -, Pages 118-143Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.nds.2021.04.005
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Funding
- Office of Nuclear Physics, Office of Science of the U.S. DOE [DE-SC0012704]
- Office of Defense Nuclear Nonproliferation Research & Development (DNN R&D), National Nuclear Security Administration, U.S. DOE
- High School Research Program educational program - Brookhaven Science Associates under DOE [DE-SC0012704]
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Fission yields and isomeric ratios are important data for various fields, but the traditional model is not able to reliably describe the statistical process following fission.
Fission yields are essential data for reactor physics, forensics, and astrophysics. In some cases, the fission yield of a fragment is divided between the ground state and a long-lived excited state, and the relative population of the two states is referred to as the isomeric ratio. In this work, we present a comprehensive compilation of experimental isomeric fission yield ratios for all target and projectile combinations. When possible, these data are combined to provide recommended isomeric fission yield ratios for low energy neutron-induced fission and spontaneous fission. The recommended ratios are compared to the traditional Madland-England model, which attempts to describe the isomeric ratios with a single parameter relating to the angular momentum of the fragment. It is found that the model does not reliably reproduce isomeric ratios outside the few nuclei it was fitted to, and its simplified treatment of the statistical process following population in fission results in average spin values, which are neither constant nor follow a recently observed saw-tooth pattern.
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