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    β-decay feeding intensity distribution of Mn64

    W. W. von Seeger1,*, P. A. DeYoung1, A. Spyrou2,3,4, S. Karampagia3,5, E. F. Brown2,3,4,6, S. Ahn4,7,8, B. P. Crider9, A. C. Dombos2,3,4, G. W. Hitt10 et al.

    C. Langer11, R. Lewis3,12, S. N. Liddick3,12, S. Lyons3,4, Z. Meisel4,13, F. Montes3,4, F. Naqvi3,14, W.-J. Ong2,3,15, C. F. Persch1, J. Pereira3,4, H. Schatz2,3,4, and K. Schmidt3,4,16

    • 1Department of Physics, Hope College, Holland, Michigan 49423, USA
    • 2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
    • 3Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
    • 4Joint Institute for Nuclear Astrophysics–Center for the Evolution of the Elements, Michigan State University, East Lansing, Michigan 48824, USA
    • 5Grand Valley State University, Allendale, Michigan 49401, USA
    • 6Department of Computational Mathematics, Science, and Engineering, Michigan State University, East Lansing, Michigan 48824, USA
    • 7Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
    • 8Center for Exotic Nuclear Studies, Institute for Basic Science, Daejon 34126, South Korea
    • 9Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA
    • 10Department of Physics and Engineering Science, Coastal Carolina University, Conway, South Carolina 29528, USA
    • 11University of Applied Sciences Aachen, 52066 Aachen, Germany
    • 12Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
    • 13Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA
    • 14Department of Nuclear Engineering, Texas A&M University, College Station, Texas 77840, USA
    • 15Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
    • 16Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany

    • *wvonseeg@nd.edu

    Phys. Rev. C 109, 044312 – Published 5 April, 2024

    DOI: https://doi.org/10.1103/PhysRevC.109.044312

    Abstract

    Nuclei around the N=40 “island of inversion” exhibit interesting structure features that have been the focus of several experimental and theoretical studies. The present work presents the first complete study of the β-decay feeding intensity distribution and Gamow-Teller distribution for the β decay of Mn64 to Fe64 up to 10 MeV. The β-decay intensity function was extracted from total absorption spectroscopy measurements made at the National Superconducting Cyclotron Laboratory with the Summing NaI(Tl) (SuN) detector. The experimental results are compared to shell model calculations with and without the inclusion of the νg9/2 orbital. From this comparison it is clear that the νg9/2 orbital is essential for the accurate description of the Fe64β-decay strength above 3 MeV, emphasizing once again the transitional nature of this nucleus into the N=40 island of inversion.

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