Experimentally constrained <sup>70</sup>Ni(n,&gamma;)<sup>71</sup>Ni cross section

ORAL

Abstract

The merger of two neutron stars was recently observed in a combination of gravitational and electromagnetic radiation.  The time profile of the electromagnetic signature of the merger event confirmed that an r-process event had taken place, identifying neutron-star mergers as at least one site for the astrophysical r-process.  The neutron-capture cross sections of the neutron-rich nuclei needed to inform r-process abundance predictions in neutron-star merger scenarios are poorly known and must be constrained through indirect techniques.  One indirect technique, the β-Oslo method, extracts the nuclear level density (NLD) and γ-ray strength function (γSF) following beta decay and uses these two quantities in a Hauser-Feshbach calculation to constrain the neutron capture cross section.  The β-Oslo method has been used previously to obtain experimentally-constrained neutron-capture cross sections of 68,69Ni. An experiment at the National Superconducting Cyclotron Laboratory measured the β-delayed γ rays of nuclei in the A~70 region to extract NLD and γSFs of neutron-rich nuclei. Results for 70Ni(n,γ)71Ni will be presented and the statistical properties and neutron-capture cross section will be compared to those of the lighter nickel isotopes.

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Presenters

  • Rebecca Lewis

    • Michigan State Univ
    • National Superconducting Cyclotron Laboratory

Authors

  • Rebecca Lewis

    • Michigan State Univ
    • National Superconducting Cyclotron Laboratory

  • Sean N. N. Liddick

    • National Superconducting Cyclotron Laboratory, Michigan State University
    • National Superconducting Cyclotron Laboratory (NSCL)
    • National Superconducting Cyclotron Laboratory
    • Michigan State Univ

  • Stephanie Lyons

    • National Superconducting Cyclotron Laboratory, Michigan State University
    • National Superconducting Cyclotron Laboratory

  • Artemis Spyrou

    • National Superconducting Cyclotron Laboratory, Michigan State University
    • National Superconducting Cyclotron Laboratory (NSCL)
    • Michigan State Univ
    • Michigan State Univ, National Superconducting Cyclotron
    • Michigan State University
    • National Superconducting Cyclotron Laboratory

  • Darren L Bleuel

    • Lawrence Livermore National Laboratory (LLNL)
    • Lawrence Livermore National Laboratory

  • Katherine L L Childers

    • Michigan State Univ
    • National Superconducting Cyclotron Laboratory

  • Benjamin Patrick Crider

    • Mississippi State University
    • Mississippi State Univ

  • Alex C Dombos

    • National Superconducting Cyclotron Laboratory, Michigan State University
    • Michigan State Univ
    • National Superconducting Cyclotron Laboratory

  • Caley Harris

    • National Superconducting Cyclotron Laboratory, Michigan State University
    • Michigan State Univ

  • Ann-Cecilie Larsen

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

  • Alicia Palmisano

    • National Superconducting Cyclotron Laboratory, Michigan State University
    • Michigan State Univ
    • Michigan State University

  • Debra Richman

    • Michigan State Univ

  • Nicholas David Scielzo

    • Lawrence Livermore National Laboratory (LLNL)
    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • Anna Simon

    • Univ of Notre Dame
    • University of Notre Dame

  • Mallory K K Smith

    • National Superconducting Cyclotron Laboratory, Michigan State University
    • Michigan State University
    • Michigan State Univ
    • National Superconducting Cyclotron Laboratory

  • Antonius W Torode

    • Michigan State Univ

  • Adriana Ureche

    • Department of Nuclear Engineering, University of California, Berkeley
    • University of California, Berkeley

  • R. G.T. G.T. Zegers

    • National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA, Department of Physics and Astronomy, Michigan State University, E
    • National Superconducting Cyclotron Laboratory, Michigan State University, Joint Institute for Nuclear Astrophysics - Center for the Evolution of the Elements, Michigan State
    • National Superconducting Cyclotron Laboratory, Michigan State University, Department of Physics and Astronomy, Michigan State University
    • Michigan State Univ
    • NSCL/MSU, for the RCNP E441 Collaboration