First beta-delayed neutron emission from 54K

ORAL

Abstract

Exotic nuclei in the vicinity of 54Ca have attracted tremendous attention in the last few years owing to the new N=32,34 shell closures emerging with extreme neutron excess [1, 2]. Experimentally, it has been revealed that the N=34 shell gap disappears already in the titanium isotopes where there are two valence protons outside the Z=20 core [3]. Below Z=20, however, it is not yet fully clear how the energy gap evolves as a function of proton number. In order to address the question, the beta decay of 54K was studied at the FRIB Decay Station Initiator (FDSi). Strong Gamow-Teller transitions were observed populating neutron unbound states in 54Ca. In this contribution, I will present the experimental results, including beta-delayed neutron and gamma-ray spectra. In addition, I will discuss the ab-initio calculations with VS-IMSRG as well as the large-scale shell-model calculations we performed to gain insights into the underlying shell structure south of 54Ca.



[1] D. Steppenbeck et al., Nature 502, 207 (2013).

[2] F. Wienholtz et al., Nature 498, 346 (2013).

[3] S. Iimura et al., Phys. Rev. Lett. 130, 012501 (2023).

*This project was supported by the Office of Nuclear Physics, U.S. Department of Energy, under Award No. DE-FG02-96ER40983, No. DE-AC05-00OR22725, and No. DE-AC52-07NA27344, National Nuclear Security Administration under the Stewardship Science Academic Alliances program through DOE Award No. DE-436NA0003899, No. DE-NA0002132, and No. DE-NA0004068, and by NSF Major Research Instrumentation Program Award No. 1919735.

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Presenters

  • Zhengyu Xu

    • University of Tennessee

Authors

  • Zhengyu Xu

    • University of Tennessee

  • Robert K. Grzywacz

    • University of Tennessee

  • Wei Jia Ong

    • Lawrence Livermore National Lab
    • Lawrence Livermore National Laboratory

  • James M Allmond

    • Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

  • Honey Arora

    • Central Michigan University

  • Hannah C Berg

    • Facility for Rare Isotope Beams, Michigan State University

  • J M Berkman

    • FRIB

  • Darren L Bleuel

    • Lawrence Livermore National Laboratory

  • Konstantinos Bosmpotinis

    • FRIB

  • James Matthew Christie

    • University of Tennessee

  • Ian C Cox

    • University of Tennessee

  • Heather L Crawford

    • Lawrence Berkeley National Laboratory

  • Benjamin P Crider

    • Mississippi State University

  • Amelia Doetsch

    • Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA

  • J G Duarte

    • LLNL

  • Alfredo Estradé

    • Central Michigan University

  • Alexandra Fijalkowska

    • University of Warsaw

  • Christoforos Frantzis

    • Facility for Rare Isotope Beams
    • FRIB

  • Tawfik Mohammed Mosaad Gaballah

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

  • Tim Gray

    • Oak Ridge National Laboratory

  • Kenny Haak

    • Michigan State University

  • Adam Hartley

    • Michigan State University

  • Matthias Heinz

    • Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

  • Donnie T Hoskins

    • University of Tennessee

  • J Huffman

    • Michigan State University

  • Rahul Jain

    • Michigan State University

  • Thomas T King

    • Oak Ridge National Laboratory

  • Noritake Kitamura

    • University of Tokyo

  • Kay Kolos

    • Lawrence Livermore National Laboratory

  • Brenden Longfellow

    • Lawrence Livermore National Laboratory

  • Rebeka Sultana Lubna

    • FRIB

  • Mejdi J Mogannam

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

  • Shree K Neupane

    • Lawrence Livermore National Laboratory

  • Timilehin H Ogunbeku

    • Lawrence Livermore National Laboratory

  • Jordan Owens-Fryar

    • Facility for Rare Isotope Beams, Michigan State University

  • Thomas Papenbrock

    • University of Tennessee

  • Bertis C Rasco

    • Oak Ridge National Laboratory

  • Jayden Elizabeth Ratcliffe

    • Mississippi State University

  • Andrea L Richard

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

  • Isaiah Richardson

    • FRIB

  • Eleanor K Ronning

    • Michigan State University

  • Thomas Ruland

    • Oak Ridge National Laboratory

  • Krzysztof Piotr Rykaczewski

    • Oak Ridge National Laboratory

  • Hendrik Schatz

    • Michigan State University and FRIB

  • Nicholas David Scielzo

    • Lawrence Livermore National Laboratory

  • Dustin Scriven

    • Michigan State University

  • Brad Sherrill

    • Michigan State University

  • Artemis Spyrou

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

  • michal Stepaniuk

    • University of Warsaw

  • Adriana Sweet

    • University of California, Berkeley

  • Oleg B. Tarasov

    • Michigan State University

  • Artemis Tsantiri

    • Michigan State University

  • Sivahami Uthayakumaar

    • Facility for Rare Isotope Beams, Michigan State University,

  • Shane Watters

    • FRIB
    • Michigan State University

  • Rin Yokoyama

    • University of Tokyo