Extinction of the N=20 neutron-shell closure for 32Mg examined by direct mass measurements

A.A. Kwiatkowski; A. Chaudhuri; A. Lennarz; A.T. Gallant; B.E. Schultz; C. Andreoiu; D. Lunney; G. Gwinner; J. Dilling; M.C. Simon

arxiv: 1310.2344 · v1 · pith:IKIY3BARnew · submitted 2013-10-09 · ⚛️ nucl-ex

Extinction of the N=20 neutron-shell closure for 32Mg examined by direct mass measurements

A. Chaudhuri , C. Andreoiu , T. Brunner , U. Chowdhury , S. Ettenauer , A.T. Gallant , G. Gwinner , A.A. Kwiatkowski

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A. Lennarz D. Lunney T.D. Macdonald B.E. Schultz M.C. Simon V.V. Simon J. Dilling

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keywords shellclosuremagicmassmeasurementsallowaroundcanonical

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The 'island of inversion' around $^{32}$Mg is one of the most important paradigm for studying the disappearance of the stabilizing 'magic' of a shell closure. We present the first Penning-trap mass measurements of the exotic nuclides $^{29-31}$Na and $^{30-34}$Mg, which allow a precise determination of the empirical shell gap for $^{32}$Mg. The new value of 1.10(3) MeV is the lowest observed shell gap for any nuclide with a canonical magic number.

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Extinction of the N=20 neutron-shell closure for 32Mg examined by direct mass measurements

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