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Rosenbusch, M.; Ascher, P.; Atanasov, D.; Barbieri, C.; Beck, D.; Blaum, K.; Borgmann, Ch; Breitenfeldt, M.; Cakirli, R. b.; Cipollone, A.; George, S.; Herfurth, F.; Kowalska, M.; Kreim, S.; Lunney, D.; Manea, V.; Navrátil, P.; Neidherr, D.; Schweikhard, L.; Somà, V.; Stanja, J.; Wienholtz, F.; Wolf, R. n.; Zuber, K.
Physical review letters, 05/2015, Letnik: 114, Številka: 20Journal Article
The recently confirmed neutron-shell closure at N = 32 has been investigated for the first time below the magic proton number Z = 20 with mass measurements of the exotic isotopes K-52,K-53, the latter being the shortest-lived nuclide investigated at the online mass spectrometer ISOLTRAP. The resulting two-neutron separation energies reveal a 3 MeV shell gap at N = 32, slightly lower than for Ca-52, highlighting the doubly magic nature of this nuclide. Skyrme-Hartree-Fock-Bogoliubov and ab initio Gorkov-Green function calculations are challenged by the new measurements but reproduce qualitatively the observed shell effect.
