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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.

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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