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The onset of intruder ground states in Na isotopes is investigated bycomparing experimental data and shell-model calculations. This onset is one ofthe consequences of the disappearance of the N=20 magic structure, and the Naisotopes are shown to play a special role in clarifying the change of thismagic structure. Both the electromagnetic moments and the energy levels clearlyindicate an onset of ground state intruder configurations at neutron numberN=19 already, which arises only with a narrow N=20 shell gap in Na isotopesresulting 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 theprevious report based on the mass led to a wrong conclusion.Comment: 9 pages, 6 figures, to be published in Phys. Rev.

physical review. c. nuclear physics/physical review. c, nuclear physics

Onset of intruder ground state in exotic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Na</mml:mi></mml:mrow></mml:math>isotopes and evolution of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>20</mml:mn></mml:mrow></mml:math>shell gap

Onset of intruder ground state in exoticNaisotopes and evolution of theN=20shell gap