The Mass of <sup>128</sup>Sb and its Role as an Astromer

ORAL

Abstract

Recently it was shown that nuclear isomers play a significant role in nucleosynthetic pathways, in particular the rapid neutron-capture process. These astrophysically metastable isomers, otherwise known as ``astromers", influence the population of unstable nuclei and hence can impact the heating and light output. We have recently performed the first direct mass measurements of one such astromer 128Sb and of the ground state 128Sb using the Canadian Penning Trap mass spectrometer at Argonne National Laboratory. We find an excitation energy of this astromer that differs significantly from the previous upper limit, changing its thermalization temperature. Our measurement provides the first step in understanding the role of 128Sb in the rapid neutron-capture process, and we will discuss some of the implications.

*This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344, and supported from the Natural Sciences and Engineering Research Council of Canada: Grant SAPPJ-2018-00028, as well as by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357. L. V. was supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-1746045. M.B. acknowledges support from the NSF under Grant No. PHY-2011890. This research used resources of ANL's ATLAS facility, which is a DOE Office of Science User Facility.

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Presenters

  • Daniel E Hoff

    • Lawrence Livermore National Laboratory
    • University of Massachusetts Lowell

Authors

  • Daniel E Hoff

    • Lawrence Livermore National Laboratory
    • University of Massachusetts Lowell

  • Kay Kolos

    • Lawrence Livermore National Laboratory
    • LLNL

  • Biying Liu

    • University of Notre Dame

  • Dwaipayan Ray

    • University of Manitoba

  • Adrian A Valverde

    • Argonne National Laboratory/University of Manitoba
    • University of Manitoba

  • Maxime Brodeur

    • University of Notre Dame

  • Daniel P Burdette

    • University of Notre Dame
    • Argonne National Laboratory

  • Nathan Callahan

    • Argonne National Laboratory

  • Jason A Clark

    • Argonne National Laboratory
    • Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA

  • Aaron T Gallant

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Natl Lab

  • Filip G Kondev

    • Argonne National Laboratory
    • Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA

  • G. Wendell Misch

    • Los Alamos National Laboratory

  • Graeme Morgan

    • Louisiana State University

  • Matthew R Mumpower

    • Los Alamos National Laboratory
    • LANL

  • Rodney Orford

    • Lawrence Berkeley National Laboratory
    • LBNL

  • William S Porter

    • University of Notre Dame

  • Fabio Rivero

    • University of Notre Dame

  • Guy Savard

    • Argonne National Laboratory

  • Nicolas D Scielzo

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Lab

  • Kumar S Sharma

    • University of Manitoba
    • U. Manitoba

  • Kamila Sieja

    • Universite de Strasbourg

  • Trevor M Sprouse

    • Los Alamos National Laboratory

  • Louis Varriano

    • University of Chicago