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Microsecond Isomer at the N=20 Island of Shape Inversion Observed at FRIB.

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Affiliations

  • 1. Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
      Authors
    • Gray TJ 1
    • Allmond JM 1
    • King TT 1
    • Grzywacz R 1, 2
    • Macchiavelli AO 1
    • Laminack A 1
    • Rasco BC 1
    • Rykaczewski KP 1
    (8 authors)
  • 2. Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA.
      Authors
    • Xu Z 2
    • Grzywacz R 1, 2
    • Chan J 2
    • Christie J 2
    • Cox I 2
    • Heideman J 2
    • Huegen H 2
    • Kitamura N 2
    • Madurga M 2
    • Neupane S 2
    • Nowicki A 2
    • Siegl K 2
    • Singh M 2
    (13 authors)
  • 3. Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA.
      Authors
    • Lubna RS 3
    • Liddick SN 3
    • Andalib A 3
    • Argo E 3
    • Chester A 3
    • Doetsch AA 3
    • Dopfer J 3
    • Jain R 3
    • Mahajan R 3
    • Mogannam MJ 3
    • Ogunbeku TH 3, 6
    • Ronning EK 3
    • Rubino E 3
    • Schaedig L 3
    • Wheeler T 3
    (15 authors)
  • 4. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
      Authors
    • Crawford HL 4
    • Campbell CM 4
    • Fallon P 4
    • Porzio C 4
    (4 authors)
  • 5. Department of Physics, Florida State University, Tallahassee, Florida 32306, USA.
      Authors
    • Tripathi V 5
    • Benetti C 5
    • Bhattacharya S 5
    • Tabor SL 5
    • Tang TL 5
    (5 authors)
    • Show all (16)

ORCIDs linked to this article

Show all (17)

Physical Review Letters, 01 Jun 2023, 130(24):242501
https://doi.org/10.1103/physrevlett.130.242501 PMID: 37390416 

Abstract 

Excited-state spectroscopy from the first experiment at the Facility for Rare Isotope Beams (FRIB) is reported. A 24(2)-μs isomer was observed with the FRIB Decay Station initiator (FDSi) through a cascade of 224- and 401-keV γ rays in coincidence with ^{32}Na nuclei. This is the only known microsecond isomer (1  μs≤T_{1/2}<1  ms) in the region. This nucleus is at the heart of the N=20 island of shape inversion and is at the crossroads of the spherical shell-model, deformed shell-model, and ab initio theories. It can be represented as the coupling of a proton hole and neutron particle to ^{32}Mg, ^{32}Mg+π^{-1}+ν^{+1}. This odd-odd coupling and isomer formation provides a sensitive measure of the underlying shape degrees of freedom of ^{32}Mg, where the onset of spherical-to-deformed shape inversion begins with a low-lying deformed 2^{+} state at 885 keV and a low-lying shape-coexisting 0_{2}^{+} state at 1058 keV. We suggest two possible explanations for the 625-keV isomer in ^{32}Na: a 6^{-} spherical shape isomer that decays by E2 or a 0^{+} deformed spin isomer that decays by M2. The present results and calculations are most consistent with the latter, indicating that the low-lying states are dominated by deformation.

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Read article at publisher's site: https://doi.org/10.1103/physrevlett.130.242501

Read article for free, from open access legal sources, via Unpaywall: https://repositorio.uam.es/bitstream/10486/708568/1/9301558.pdfUnpaywall

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Funding 

Funders who supported this work.

Agencia Estatal de Investigación (2)

Australian Research Council (1)

Deutsche Forschungsgemeinschaft (1)

Jülich Supercomputing Centre, Forschungszentrum Jülich

    Ministerio de Ciencia e Innovación

      National Nuclear Security Administration

        National Science Foundation (3)

        U.S. Department of Energy (11)