Informing (n,γ) reaction rates in weak r-process nucleosynthesis: <sup>80</sup>Ge(d,p) measurements at FRIB with GODDESS

ORAL

Abstract

Individual (n,g) rates become important during freeze out from the weak r-process, near Z=26-34 and N=50. Sensitivity studies [1] have identified specific isotopes, e.g., 80Ge, where unknown (n,g) rates could have significant impacts on final r-process abundance patterns. 80Ge is in reach at FRIB and an experiment was completed in April 2024 to inform the 80Ge(n,g) rate. The (d,pg) reaction was measured with an 80Ge beam using GODDESS [2] and the S800 at an energy of 45 MeV/u. The goal of this experiment is to inform the compound nucleus (n,g) cross sections via the Surrogate Reaction Method [3]. In combination with a previous measurement [4] at ~4 MeV/u, this measurement would also serve to constrain spectroscopic factors for bound states from which direct-semi-direct neutron capture cross sections would be determined. Preliminary results will be reported.

References:

[1] R. Surman et al. AIP Advances 4, 041008 (2014)

[2] S.D. Pain et al. Physics Procedia 90, 455 (2017)

[3] J.E. Escher et al., Rev. Mod. Phys. 84, 353 (2012)

[4] S. Ahn et al. Phys. Rev. C 100, 04613 (2019)

*This work is supported in part by the National Science Foundation and the U.S. Department of Energy. Portions of this work were performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344

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Presenters

  • Mara Mikelah Grinder

    • Rutgers University

Authors

  • Mara Mikelah Grinder

    • Rutgers University

  • Sudarsan Balakrishnan

    • Rutgers University
    • Louisiana State University
    • Department of Physics and Astronomy, Louisiana State University

  • Jolie Antonia Cizewski

    • Rutgers University

  • Steven D. Pain

    • Oak Ridge National Laboratory / University of Tennessee-Knoxville

  • Kelly A. Chipps

    • Oak Ridge National Laboratory, Oak Ridge, TN, USA / Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, USA
    • Oak Ridge National Laboratory

  • Andrew Ratkiewicz

    • Lawrence Livermore National Laboratory

  • Timothy J Gray

    • University of Tennessee

  • Kate L Jones

    • University of Tennessee