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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).

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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

  • 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

  • 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

  • Tawfic Mohammed Mosaad Gaballah

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

  • 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

  • Toby T King

    Oak Ridge National Laboratory

  • Noritake Kitamura

    University of Tokyo

  • Kay Kolos

  • Brenden Longfellow

  • Rebeka Sultana Lubna

    FRIB

  • Mejdi J Mogannam

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

  • Shree K Neupane

  • Timilehin H Ogunbeku

  • Jordan Owens-Fryar

    Facility for Rare Isotope Beams, Michigan State University

  • Thomas Papenbrock

    University of Tennessee

  • Charlie 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

  • Dustin Scriven

    Michigan State University

  • Brad Sherrill

    Michigan State University

  • Artemis Spyrou

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

    Michigan State University, FRIB

  • Rin Yokoyama

    University of Tokyo