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; J. Dilling

doi:10.1103/PHYSREVC.88.054317

Journal articles

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 ¹ T. D. Macdonald B. E. Schultz M. C. Simon V. V. Simon J. Dilling

1 CSNSM SNO

CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière : UMR8609

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 29‑31Na and 30‑34Mg, 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.

Keywords : Binding energies and masses Shell model 20<=A<=38

Document type :

Journal articles

Domain :

Physics [physics] / Nuclear Experiment [nucl-ex]

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http://hal.in2p3.fr/in2p3-00920388
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Submitted on : Wednesday, December 18, 2013 - 12:35:37 PM
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Evidence for the extinction of the N=20 neutron-shell closure for 32Mg from direct mass measurements

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

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