First β-delayed γ-ray spectroscopy of <sup>32</sup>Na

ORAL

Abstract

The N=20 island of inversion provides a unique opportunity to explore nuclear shell evolution approaching the neutron dripline. As the N=20 shell gap appears to collapse, low-lying intruder states emerge. While 32Na lies near the center of this region, much remains unknown about this isotope. Only four excited states are known, two of which are isomeric [1, 2]. Of particular interest is the 625 keV, 24 μs isomer, the character of which is uncertain. There are two possible theoretical scenarios—a spherical shape isomer or a deformed spin isomer—which reasonably reproduce experimental data [1]. Determining the spin-parity of this state would allow unambiguous determination of the character of this isomer. In the present work, β-decay of 30,32Ne is studied at the Facility for Rare Isotope Beams (FRIB) using the FRIB Decay Station initiator (FDSi). This is the first β-delayed γ-ray spectroscopy of 32Na. Progress on the 32Na level scheme will be presented, including γ-ray energies, excited state energies, and tentative spin-parities.

[1] T. J. Gray et. al., Phys. Rev. Lett. 130, 242501 (2023).

[2] E. M. Lykiardopoulou et. al., Phys. Rev. Lett. 134, 052503 (2025).

**This work is supported by the US Department of Energy (DOE) Office of Science under Grant Nos. DE-SC0000661 and DE-SC0023633.

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Presenters

  • Amelia A Doetsch

    • Facility for Rare Isotope Beams, Michigan State University
    • Michigan State University

Authors

  • Amelia A Doetsch

    • Facility for Rare Isotope Beams, Michigan State University
    • Michigan State University

  • Sean N Liddick

    • Facility for Rare Isotope Beams, Michigan State University
    • Facility for Rare isotope Beams; Department of Chemistry, Michigan State University

  • Heather L Crawford

    • Lawrence Berkeley National Laboratory

  • James M Allmond

    • Oak Ridge National Laboratory

  • Benjamin Patrick Crider

    • Mississippi State University

  • Robert K. Grzywacz

    • University of Tennessee

  • Vandana Tripathi

    • Florida State University

  • Samuel Oluwamayowa Ajayi

    • Florida State University

  • Corrigan J Appleton

    • Lawrence Berkeley National Laboratory

  • Honey Arora

    • Central Michigan University

  • Peter C Bender

    • University of Massachusetts Lowell

  • Caleb B Benetti

    • Facility for Rare Isotope Beams

  • Jessica M Berkman

    • Michigan State University
    • Facility for Rare Isotope Beams; Department of Chemistry, Michigan State University

  • Nico Braukman

    • University of Tennessee, Knoxville

  • Christopher M Campbell

    • Lawrence Berkeley National Laboratory

  • M.P. P Carpenter

    • Argonne National Laboratory

  • James Matthew Christie

    • University of Tennessee

  • Roderick M Clark

    • Lawrence Berkeley National Laboratory

  • Ian C Cox

    • University of Tennessee

  • Joseph Dopfer

    • Michigan State University

  • Paul Fallon

    • Lawrence Berkeley National Laboratory

  • Tawfik Mohammed Mosaad Gaballah

    • Department of Physics and Astronomy, Mississippi State University, Mississippi State, MS 39762, USA
    • Mississippi State University

  • Rahul Jain

    • Michigan State University

  • Noritaka Kitamura

    • University of Tennessee

  • Thomas T King

    • Oak Ridge National Laboratory

  • Kay Kolos

    • Lawrence Livermore National Laboratory

  • Brenden Longfellow

    • Lawrence Livermore National Laboratory

  • Rebeka Sultana Lubna

    • FRIB

  • Miguel Madurga

    • University of Tennessee

  • Mejdi J Mogannam

    • Michigan State University
    • Facility for Rare Isotope Beams; Department of Chemistry, Michigan State University

  • Shree K Neupane

    • Lawrence Livermore National Laboratory

  • Eleanor K Ronning

    • Michigan State University

  • Dustin P Scriven

    • Facility for Rare Isotope Beams

  • Artemis Spyrou

    • Facility for Rare Isotope Beams, Michigan State University
    • Facility for Rare Isotope Beams; Department of Physics and Astronomy, Michigan State University

  • Samuel L Tabor

    • Florida State University

  • Mac B Wheeler

    • Florida State University

  • Catur Wibisono

    • Florida State University

  • Mathis Wiedeking

    • Lawrence Berkeley National Laboratory

  • Zhengyu Xu

    • University of Tennessee

  • Yiyi Zhu

    • University of Massachusetts Lowell