Phys. Rev. C 70, 044307 (2004) [8 pages]Onset of intruder ground state in exotic Na isotopes and evolution of the N=20 shell gap
Yutaka Utsuno1, Takaharu Otsuka2,3,4, Thomas Glasmacher5, Takahiro Mizusaki6, and Michio Honma7 Received 24 June 2004; published 18 October 2004 The onset of intruder ground states in Na isotopes is investigated by comparing experimental data and shell-model calculations. This onset is one of the consequences of the disappearance of the N=20 magic structure, and the Na isotopes are shown to play a special role in clarifying the change of this magic structure. Both the electromagnetic moments and the energy levels clearly indicate an onset of ground state intruder configurations at neutron number N=19 already, which arises only with a narrow N=20 shell gap in Na isotopes resulting from the spin-isospin dependence of the nucleon-nucleon interaction (as compared to a wider gap in stable nuclei like 40Ca ). It is shown why the previous report based on the mass led to a wrong conclusion. ©2004 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevC.70.044307 [ Abstract | Previous article | Next article | Issue 4 ] |
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