Shape Coexistence in Ni78 as the Portal to the Fifth Island of Inversion

F. Nowacki, A. Poves, E. Caurier, and B. Bounthong
Phys. Rev. Lett. 117, 272501 – Published 27 December 2016

Abstract

Large-scale shell-model calculations predict that the region of deformation which comprises the heaviest chromium and iron isotopes at and beyond N=40 will merge with a new one at N=50 in an astonishing parallel to the N=20 and N=28 case in the neon and magnesium isotopes. We propose a valence space including the full pf shell for the protons and the full sdg shell for the neutrons, which represents a comeback of the the harmonic oscillator shells in the very neutron- rich regime. The onset of deformation is understood in the framework of the algebraic SU(3)-like structures linked to quadrupole dominance. Our calculations preserve the doubly magic nature of the ground state of Ni78, which, however, exhibits a well-deformed prolate band at low excitation energy, providing a striking example of shape coexistence far from stability. This new IOI adds to the four well-documented ones at N=8, 20, 28, and 40.

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  • Received 30 May 2016

DOI:https://doi.org/10.1103/PhysRevLett.117.272501

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

F. Nowacki1,2, A. Poves3, E. Caurier1,2, and B. Bounthong1,2

  • 1Université de Strasbourg, IPHC, 23 rue du Loess 67037 Strasbourg, France
  • 2CNRS, UMR7178, 67037 Strasbourg, France
  • 3Departamento de Física Teórica e IFT-UAM/CSIC, Universidad Autónoma de Madrid, E-28049 Madrid, Spain and Institute for Advanced Study, Université de Strasbourg, France

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Issue

Vol. 117, Iss. 27 — 30 December 2016

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