Onset of intruder ground state in exotic Na isotopes and evolution of the N=20 shell gap

Details Onset of intruder ground state in exotic Na isotopes and evolution of the N=20 shell gap Onset of intruder ground state in exotic Na isotopes and evolution of the N=20 shell gap

2004-07-23

arxiv.org/abs/nucl-th/0407082v1

Phys.Rev. C70 (2004) 044307

Physics

Nuclear Physics

Nuclear Theory

9 pages, 6 figures, to be published in Phys. Rev. C

Scientific paper

10.1103/PhysRevC.70.044307

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.

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