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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.

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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