Reaction and lifetime studies of <sup>32</sup>Mg through 2-proton knockout

ORAL

Abstract

In the Island of Inversion at N = 20, ground states are dominated by intruder configurations with particle-hole excitations across the shell gap instead of normal 0p0h configurations. For example in 32Mg the yrast band appears to be deformed instead of spherical, indicating that intruder configurations are preferred compared to the normal closed-shell configuration. Until recently, 32Mg had been understood in terms of the competition between the 0p0h and 2p2h configurations but this picture predicts a higher energy and lower (t, p) cross section for the isomeric 0+2 state than was observed. To understand the importance of including the 4p4h configuration we performed reaction and lifetime studies of 32Mg by means of 2p knockout from 34Si at the NSCL. Gamma-ray energy and position information measured by GRETINA was used along with various lifetime measurement techniques that cover a range of possible lifetimes. New results are presented and discussed in the context of competition between normal and intruder configurations.

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Presenters

  • Robert Elder

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

Authors

  • Robert Elder

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

  • Hironori Iwasaki

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

  • John Ash

    • National Superconducting Cyclotron Laboratory, Michigan State University

  • Daniel Bazin

    • National Superconducting Cyclotron Laboratory, Michigan State University
    • Michigan State Univ
    • National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
    • Michigan State University

  • Peter C C Bender

    • Univ of Mass - Lowell
    • Michigan State Univ
    • UMass Lowell

  • Thomas Braunroth

    • University of Cologne

  • Christopher M Campbell

    • Lawrence Berkeley Natl Lab

  • Heather Crawford

    • Nuclear Science Division, Lawrence Berkeley National Laboratory
    • Lawrence Berkeley Natl Lab
    • Lawrence Berkeley Natl Lab, Argonne Natl Lab, Los Alamos Natl Lab, University of Connecticut, iThemba LABS, University of Maryland
    • Lawrence Berkeley National Laboratory

  • Brandon Elman

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

  • Alexandra Gade

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

  • Mara Grinder

    • National Superconducting Cyclotron Laboratory, Michigan State University

  • Nobuyuki Kobayashi

    • RCNP, Osaka Univ.
    • RCNP
    • RCNP (Osaka University)
    • RCNP, Osaka University
    • RCNP, Osaka Universiry
    • Research Center for Nuclear Physics, Osaka University

  • Charles R Loelius

    • National Superconducting Cyclotron Laboratory, Michigan State University

  • Brenden Longfellow

    • National Superconducting Cyclotron Laboratory, Michigan State University

  • Eric Lunderberg

    • National Superconducting Cyclotron Laboratory, Michigan State University

  • Tea Mijatovic

    • National Superconducting Cyclotron Laboratory, Michigan State University

  • Jorge Pereira

    • National Superconducting Cyclotron Laboratory, Michigan State University
    • Michigan State Univ
    • National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
    • NSCL, Department of Physics and Astronomy, Michigan State University
    • National Superconducting Cyclotron Laboratory
    • NSCL

  • Daniel Rhodes

    • National Superconducting Cyclotron Laboratory, Michigan State University

  • Dirk W W Weisshaar

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