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

Utsuno, Yutaka  ; Otsuka, Takaharu*; Glasmacher, T.*; Mizusaki, Takahiro*; Homma, Michio*

We perform systematic calculations of nuclear moments and energy levels in neutron-rich Na isotopes with the Monte Carlo shell model by adopting a large model space consisting of the full $$sd$$ and part of the $$pf$$ orbits. The calculation well reproduces those observables. The result shows that the disappearance of the $$N=20$$ magic number starts already at $$N=18$$ and that the magicity completely disappears for the $$N=19$$ isotone $$^{30}$$Na. This is in sharp contrast to previous consensus that the magic number disappears at $$N=20$$ and beyond. This early onset of disappearance indicates that the $$N=20$$ shell gap considerably narrows in Na isotopes compared to stable nuclei near $$^{40}$$Ca.

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Category:Physics, Nuclear

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