Experimentally constrained 70Ni(n,γ)71Ni 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.

–

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