Evidence for the extinction of the N = 20 neutron-shell closure for <sup>32</sup>Mg from direct mass measurements
- Chaudhuri, A.
- Andreoiu, C.
- Brunner, T.
- Chowdhury, U.
- Ettenauer, S.
- Gallant, A.
- Gwinner, G.
- Kwiatkowski, A.
- Lennarz, A.
- Lunney, D.
- Macdonald, T.
- Schultz, B.
- Simon, M.
- Simon, V.
- Dilling, J.
Publication date
November 2013
DOIAbstract
The “island of inversion” around <sup>32</sup>Mg 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 <sup>29−31</sup>Na and <sup>30−34</sup>Mg, which allow precise determination of the empirical shell gap for <sup>32</sup>Mg. 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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