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How Robust is the N=34 Subshell Closure? First Spectroscopy of Ar52

H. N. Liu et al.
Phys. Rev. Lett. 122, 072502 – Published 21 February 2019

Abstract

The first γ-ray spectroscopy of Ar52, with the neutron number N=34, was measured using the K53(p,2p) one-proton removal reaction at 210MeV/u at the RIBF facility. The 21+ excitation energy is found at 1656(18) keV, the highest among the Ar isotopes with N>20. This result is the first experimental signature of the persistence of the N=34 subshell closure beyond Ca54, i.e., below the magic proton number Z=20. Shell-model calculations with phenomenological and chiral-effective-field-theory interactions both reproduce the measured 21+ systematics of neutron-rich Ar isotopes, and support a N=34 subshell closure in Ar52.

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  • Received 8 November 2018
  • Revised 22 January 2019

DOI:https://doi.org/10.1103/PhysRevLett.122.072502

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. 122, Iss. 7 — 22 February 2019

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