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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

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Yutaka Utsuno1, Takaharu Otsuka2,3,4, Thomas Glasmacher5, Takahiro Mizusaki6, and Michio Honma7
1Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
2Department of Physics, University of Tokyo, Hongo, Tokyo 113-0033, Japan
3Center for Nuclear Study, University of Tokyo, Hongo, Tokyo 113-0033, Japan
4RIKEN, Hirosawa, Wako-shi, Saitama 351-0198, Japan
5National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
6Institute of Natural Sciences, Senshu University, Higashimita, Tama, Kawasaki, Kanagawa 214-8580, Japan
7Center for Mathematical Sciences, University of Aizu, Tsuruga, Ikki-machi Aizu-Wakamatsu, Fukushima 965-8580, Japan

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
DOI:
10.1103/PhysRevC.70.044307
PACS:
21.60.Cs, 21.60.Ka, 27.30.+t
 
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