Constraining the Synthesis of the Lightest p Nucleus Se 74

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Abstract
We provide the first experimental cross section of the ^{73}As(p,γ)^{74}Se reaction to constrain one of the main destruction mechanisms of the p nucleus ^{74}Se in explosive stellar environments. The measurement was done using a radioactive ^{73}As beam at effective center-of-mass energies of 2.9 and 2.3 MeV/nucleon. Along with the total cross-section measurement, statistical properties of the ^{74}Se compound nucleus were extracted, constraining the reaction cross section in the upper Gamow window of the γ process. The impact of the experimentally constrained reaction rate on ^{74}Se production in Type II supernovae was investigated through Monte Carlo one-zone network simulations. The results indicate that the overproduction of ^{74}Se by Type II supernova models cannot be resolved by nuclear physics alone and point toward the need for a more detailed understanding of the astrophysical conditions of relevance for the γ process.
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Funding Information
  • National Science Foundation (PHY-1913554, PHY-2209429, PHY-2209138, OISE-1927130 (IReNA))
  • National Nuclear Security Administration (DE-NA0004071, DE-NA0003180)
  • U.S. Department of Energy (DOE-DE-NA0003906)
  • Office of Science
  • Nuclear Physics
  • Michigan State University (DE-SC0023633)
  • Natural Sciences and Engineering Research Council of Canada (SAPPJ-797 2021-00032)
  • Laboratory Directed Research and Development
  • Pacific Northwest National Laboratory
  • Battelle

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