β-decay strength distributions of <sup>66,68</sup>Co

ORAL

Abstract

Approximately half of the elements heavier than iron are thought to be produced in the rapid-neutron capture process. Recent insights into the astrophysical site of this critical process highlight the need for experimental data on short-lived neutron-rich nuclei. R-process nucleosynthesis sensitivity studies show that the final abundance distributions of r-process nuclei are greatly impacted by β-decay properties, such as half-lives and β-delayed neutron-emission probabilities. The β-decay strengths for 66,68Co have been measured using the technique of total absorption spectroscopy with the Summing NaI (SuN) detector at the National Superconducting Cyclotron Laboratory and results for both nuclei will be presented. Highlighted is the resultant ground-state spin of 66Co confirmed to be Jp=1+, making a ground-state to ground-state transition an allowed transition. The resultant β-decay intensities and deduced Gamow-Teller strengths are compared to theoretical calculations used in r-process models.

[1] M. R. Mumpower, R. Surman, G.C. McLaughlin, A. Aprahamian. Progress in Particle and Nuclear Physics 86 (2016), 86-126.

*This work was supported by the Laboratory Directed Research and Development Program at Pacific Northwest National Laboratory operated by Battelle for the U.S. Department of Energy.

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Presenters

  • Stephanie M Lyons

    • Pacific Northwest National Laboratory
    • Michigan State University
    • NSCL Michigan State University
    • Pacific Northwest National Lab
    • Pacific Northwestern National Laboratory
    • FRIB

Authors

  • Stephanie M Lyons

    • Pacific Northwest National Laboratory
    • Michigan State University
    • NSCL Michigan State University
    • Pacific Northwest National Lab
    • Pacific Northwestern National Laboratory
    • FRIB

  • Artemis Spyrou

    • FRIB/MSU

  • Darren L Bleuel

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

  • Katherine L Childers

    • Michigan State University
    • Texas A&M University

  • Benjamin P Crider

    • Mississippi State University
    • Texas A&M University

  • Alexander C Dombos

    • University of Notre Dame

  • Erin C Good

    • FRIB

  • Caley Harris

    • Facility for Rare Isotope Beams
    • FRIB/MSU

  • Ann Cecilia Larsen

    • Univ of Oslo
    • University of Oslo

  • Rebecca Lewis

    • Michigan State University
    • Zeno Power

  • Sean Liddick

    • FRIB/MSU
    • FRIB
    • National Superconducting Cyclotron Laboratory, Facility for Rare Isotopes Beams, Michigan State University

  • Alicia Palmisano

    • UTK
    • University of Tennessee Knoxville

  • Debra Richman

    • FRIB/MSU

  • Nicolas D Scielzo

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

  • Anna Simon

    • University of Notre Dame

  • Hannah C Berg

    • Facility for Rare Isotope Beams
    • FRIB/MSU
    • Michigan State University

  • Mallory Smith

    • Michigan State University
    • FRIB
    • SmithMa@frib.msu.edu

  • Adriana Sweet

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore National Lab

  • Remco Zegers

    • FRIB
    • FRIB/MSU
    • FRIB, MSU

  • Magne S Guttormsen

    • Department of Physics, University of Oslo
    • University of Oslo

  • Jacob Davis

    • Pacific Northwest National Laboratory