Angular momentum selectivity of the beta-Oslo method to measure gamma-ray strength and nuclear level density

ORAL

Abstract

Recently, the beta-Oslo Method was developed, a new application of the Oslo Method to nuclei formed by beta decay, allowing strength function and level density measurements in neutron-rich nuclei. However, in the case of Gamow-Teller beta decay being dominant, the angular-momentum range of states populated in the daughter nucleus is within 1$\hbar$, much more narrow than for charged-particle reactions used in the Oslo method.

To investigate the effect on the Oslo Method of this angular momentum selectivity, artificial nuclear level schemes for a range of neutron-rich strontium isotopes were generated by the Monte Carlo codes DICEBOX and RANIER. Gamma ray cascades were simulated from distributions of states with angular momentum that can be populated by beta decay and analyzed with the Oslo Method.  The strength functions and nuclear level densities extracted were then compared to both the known models used to generate the cascades and those parameters extracted from a broader initial angular momentum distribution.

*Work performed by LLNL under Contract DE-AC52-07NA27344, by LBNL under Contract DE-AC02-05CH11231, and by DOE NNSA through the NSSC under Award Number DE-NA0003180.

–

Presenters

  • Darren L Bleuel

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

Authors

  • Darren L Bleuel

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

  • Adriana Ureche

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

  • Lee Allen Bernstein

    • Lawrence Berkeley National Laboratory (LBNL)
    • Lawrence Berkeley Natl Lab
    • Lawrence Berkeley National Lab

  • Bethany L. Goldblum

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

  • Magne S. Guttormsen

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

  • Thibault A. Laplace

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

  • Ann-Cecilie Larsen

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

  • Sean N. N. Liddick

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

  • Nicholas David Scielzo

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

  • Jasmina Vujic

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