Nuclear resonance fluorescence as a complementary probe of triple shape coexistence in <sup>64</sup>Ni

ORAL

Abstract

A recent study of 64Ni [1], which combined four complementary experimental techniques, revealed three coexisting shapes, extended shape coexistence first observed in the neutron-rich nickel isotopes to the heaviest stable one, and agreed with Monte-Carlo shell-model (MCSM) calculations. The stability of 64Ni facilitates experiments with nuclear resonance fluorescence and can shed additional light on this nucleus [2].



With the polarized, quasi-monoenergetic photon beam from the HIγS facility [3], 64Ni excited states were populated at energies of 8.7 and 8.95 MeV, and their decays through levels at lower excitation energies were characterized. Specifically, the spins and parities of the observed states were firmly established through γγ-angular correlations. In addition to the excitation energies, and quantum numbers of newly observed levels, information on their decay branching and mixing ratios and lifetimes provide further tests of the MCSM predictions.



[1] N. Mărginean et al., Phys. Rev. Lett. 125, 10502 (2020)

[2] D. R. Little, PhD Thesis, UNC at Chapel Hill (2020)

[3] H. R. Weller et al., Prog. Part. Nucl. Phys. 62, 257 (2009)

*This work is supported by the U.S. Department of Energy, Office of Science, Office of Nu-clear Physics, under Grant Numbers DE-FG02-97ER41041 (UNC) and DEFG02-97ER41033(TUNL).

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Presenters

  • Udo Friman-Gayer

    • Department of Physics & Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC-27599-3255, USA and Triangle Universities Nuclear Laboratory, Duke University,

Authors

  • Udo Friman-Gayer

    • Department of Physics & Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC-27599-3255, USA and Triangle Universities Nuclear Laboratory, Duke University,

  • Akaa D Ayangeakaa

    • Department of Physics & Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC-27599-3255, USA and Triangle Universities Nuclear Laboratory, Duke University,

  • Sean W Finch

    • Department of Physics and Triangle Universities Nuclear Laboratory, Duke University, Durham, NC-27708-2308
    • TUNL and Duke University
    • Duke University
    • TUNL/Duke University

  • Anne M Forney

    • Department of Chemistry and Biochemistry, University of Maryland College Park, College Park, MD-20742

  • Johann Isaak

    • Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany

  • Xavier James

    • Department of Physics & Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC-27599-3255, USA and Triangle Universities Nuclear Laboratory, Duke University,

  • Robert V Janssens

    • University of North Carolina at Chapel Hill
    • Department of Physics & Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC-27599-3255, USA and Triangle Universities Nuclear Laboratory, Duke University,
    • University of North Carolina Chapel Hill

  • Samantha R Johnson

    • Department of Physics & Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC-27599-3255, USA and Triangle Universities Nuclear Laboratory, Duke University,

  • Michael D Jones

    • Department of Physics & Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC-27599-3255, USA and Triangle Universities Nuclear Laboratory, Duke University,

  • Filip G Kondev

    • Argonne National Laboratory
    • Physics Division, Argonne National Laboratory, Lemont, IL-60439

  • FNU Krishichayan

    • Department of Physics and Triangle Universities Nuclear Laboratory, Duke University, Durham, NC-27708-2308
    • TUNL and Duke University
    • Duke University

  • David R Little

    • Department of Physics & Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC-27599-3255, USA and Triangle Universities Nuclear Laboratory, Duke University,

  • Bastian Löher

    • Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany

  • Deniz Savran

    • ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany

  • Werner Tornow

    • Department of Physics and Triangle Universities Nuclear Laboratory, Duke University, Durham, NC-27708-2308
    • TUNL and Duke University
    • Duke University
    • TUNL/Duke University