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Shape Coexistence at Zero Spin in Ni64 Driven by the Monopole Tensor Interaction

N. Mărginean et al.
Phys. Rev. Lett. 125, 102502 – Published 2 September 2020

Abstract

The low-spin structure of the semimagic Ni64 nucleus has been considerably expanded: combining four experiments, several 0+ and 2+ excited states were identified below 4.5 MeV, and their properties established. The Monte Carlo shell model accounts for the results and unveils an unexpectedly complex landscape of coexisting shapes: a prolate 0+ excitation is located at a surprisingly high energy (3463 keV), with a collective 2+ state 286 keV above it, the first such observation in Ni isotopes. The evolution in excitation energy of the prolate minimum across the neutron N=40 subshell gap highlights the impact of the monopole interaction and its variation in strength with N.

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  • Received 24 June 2020
  • Accepted 31 July 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.102502

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 125, Iss. 10 — 4 September 2020

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