Evidence for the extinction of the N=20 neutron-shell closure for 32Mg from direct mass measurements

A. Chaudhuri, C. Andreoiu, T. Brunner, U. Chowdhury, S. Ettenauer, A. T. Gallant, G. Gwinner, A. A. Kwiatkowski, A. Lennarz, D. Lunney, T. D. Macdonald, B. E. Schultz, M. C. Simon, V. V. Simon, and J. Dilling
Phys. Rev. C 88, 054317 – Published 18 November 2013

Abstract

The “island of inversion” around 32Mg is one of the most important paradigms for studying the disappearance of the stabilizing “magicity” of a shell closure. We present the first Penning-trap mass measurements of the exotic nuclides 2931Na and 3034Mg, which allow precise determination of the empirical shell gap for 32Mg. The new value of 1.10(3) MeV is the smallest observed shell gap for any nuclide with a canonical magic number.

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  • Received 6 August 2013

DOI:https://doi.org/10.1103/PhysRevC.88.054317

©2013 American Physical Society

Authors & Affiliations

A. Chaudhuri1,*, C. Andreoiu2, T. Brunner1,3, U. Chowdhury1,4, S. Ettenauer1,5,†, A. T. Gallant1,5, G. Gwinner4, A. A. Kwiatkowski1, A. Lennarz1,6, D. Lunney7, T. D. Macdonald1,5, B. E. Schultz1, M. C. Simon1,‡, V. V. Simon1,8,§, and J. Dilling1,5

  • 1TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
  • 2Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
  • 3Department of Physics, Stanford University, Stanford, California 94305, USA
  • 4Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
  • 5Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
  • 6Institut für Kernphysik, Westfälische Wilhelms-Universität, 48149 Münster, Germany
  • 7CSNSM-IN2P3-CNRS, Université de Paris Sud, 91405 Orsay, France
  • 8Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany

  • *ankur@triumf.ca
  • Present address: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
  • Present address: Stefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna, Austria.
  • §Present address: Helmholtz-Institut Mainz, 55128 Mainz, Germany.

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Vol. 88, Iss. 5 — November 2013

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