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

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)

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

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
(Physics Division, Argonne National Laboratory, Lemont, IL-60439)

FNU Krishichayan
(Department of Physics and Triangle Universities Nuclear Laboratory, Duke University, Durham, NC-27708-2308)

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)

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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Bulletin of the American Physical Society

2021 Fall Meeting of the APS Division of Nuclear Physics

Volume 66, Number 8

Monday–Thursday, October 11–14, 2021; Virtual; Eastern Daylight Time

Session PF: Nuclear Structure : A = 50-70

Abstract: PF.00002 : Nuclear resonance fluorescence as a complementary probe of triple shape coexistence in 64Ni*

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Abstract: PF.00002 : Nuclear resonance fluorescence as a complementary probe of triple shape coexistence in ⁶⁴Ni*