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Proton Shell Gaps in N=28 Nuclei from the First Complete Spectroscopy Study with FRIB Decay Station Initiator.

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Affiliations

  • 1. Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.
      Authors
    • Cox I 1
    • Xu ZY 1
    • Grzywacz R 1, 3
    • Kitamura N 1
    • Hoskins D 1
    • Neupane S 1, 2
    • Christie J 1
    • Madurga M 1
    • Nowicki A 1
    • Siegl K 1
    • Singh M 1
    (11 authors)
  • 2. Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
      Authors
    • Ong WJ 2
    • Neupane S 1, 2
    • Bleuel DL 2
    • Duarte JG 2
    • Harke JT 2
    • Hoff DEM 2
    • Kolos K 2
    • Longfellow B 2
    • Ogunbeku TH 2
    • Richard AL 2
    • Sweet A 2
    (11 authors)
  • 3. Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
      Authors
    • Grzywacz R 1, 3
    • Rasco BC 3
    • Ruland TJ 3
    • Allmond JM 3
    • King TT 3
    • Rykaczewski KP 3
    • Gray TJ 3
    • Laminack A 3
    (8 authors)
  • 4. Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA.
      Authors
    • Lubna RS 4
    • Schatz H 4, 9
    • Sherrill BM 4, 9
    • Tarasov OB 4
    • Berg HC 4, 9
    • Cerizza G 4
    • Chester A 4
    • Dembski C 4, 9
    • Doetsch AA 4, 9
    • Good EC 4
    • Hermansen K 4, 9
    • Jain R 4, 9
    • Liddick SN 4
    • Mogannam MJ 4
    • Owens-Fryar G 4, 9
    • Ronning EK 4
    • Spyrou A 4, 9
    • Tsantiri A 4, 9
    (18 authors)
  • 5. Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.
      Authors
    • Ayangeakaa AD 5
    (1 author)
    • Show all (13)

ORCIDs linked to this article

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Physical Review Letters, 01 Apr 2024, 132(15):152503
https://doi.org/10.1103/physrevlett.132.152503 PMID: 38682970 

Abstract 

The first complete measurement of the β-decay strength distribution of _{17}^{45}Cl_{28} was performed at the Facility for Rare Isotope Beams (FRIB) with the FRIB Decay Station Initiator during the second FRIB experiment. The measurement involved the detection of neutrons and γ rays in two focal planes of the FRIB Decay Station Initiator in a single experiment for the first time. This enabled an analytical consistency in extracting the β-decay strength distribution over the large range of excitation energies, including neutron unbound states. We observe a rapid increase in the β-decay strength distribution above the neutron separation energy in _{18}^{45}Ar_{27}. This was interpreted to be caused by the transitioning of neutrons into protons excited across the Z=20 shell gap. The SDPF-MU interaction with reduced shell gap best reproduced the data. The measurement demonstrates a new approach that is sensitive to the proton shell gap in neutron rich nuclei according to SDPF-MU calculations.

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Read article at publisher's site: https://doi.org/10.1103/physrevlett.132.152503

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Funding 

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Laboratory Directed Research and Development

    National Nuclear Security Administration

      National Science Foundation (4)

      Nuclear Science and Security Consortium (1)

      Pacific Northwest National Laboratory

        U.S. Department of Energy (9)

        UT-Battelle