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Island of inversion around Cr64

S. M. Lenzi, F. Nowacki, A. Poves, and K. Sieja
Phys. Rev. C 82, 054301 – Published 2 November 2010
Physics logo See Synopsis: Far from the stable nuclei

Abstract

We study the development of collectivity in the neutron-rich nuclei around N=40, where the experimental and theoretical evidence suggest a rapid shape change from the spherical to the rotational regime, in analogy to what happens at the island of inversion surrounding Na31. Theoretical calculations are performed within the interacting shell-model framework in a large valence space, based on a Ca48 core, which encompasses the full pf shell for the protons and the 0f5/2, 1p3/2, 1p1/2, 0g9/2, and 1d5/2 orbits for the neutrons. The effective interaction is based on a G matrix obtained from a realistic nucleon-nucleon potential whose monopole part is corrected empirically to produce effective single-particle energies compatible with the experimental data. We find a good agreement between the theoretical results and the available experimental data. We predict the onset of deformation at different neutron numbers for the various isotopic chains. The maximum collectivity occurs in the chromium isotopes where the large deformation regime already starts at N=38. The shell evolution responsible for the observed shape changes is discussed in detail, in parallel to the situation in the N=20 region.

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  • Received 10 September 2010

DOI:https://doi.org/10.1103/PhysRevC.82.054301

©2010 American Physical Society

Synopsis

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Far from the stable nuclei

Published 29 November 2010

An advance in computational techniques for performing nuclear shell model calculations points to an island of inversion near chromium-64.

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Authors & Affiliations

S. M. Lenzi1, F. Nowacki2, A. Poves3, and K. Sieja2,*

  • 1Dipartimento di Fisica dell’Università and INFN, Sezione di Padova, I-35131 Padova, Italy
  • 2IPHC, IN2P3-CNRS et Université de Strasbourg, F-67037 Strasbourg, France
  • 3Departamento de Física Teórica e IFT-UAM/CSIC, Universidad Autónoma de Madrid, E-28049 Madrid, Spain

  • *kamila.sieja@iphc.cnrs.fr

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Issue

Vol. 82, Iss. 5 — November 2010

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