Shell evolution of N=20 nuclei and Gamow-Teller strengths of Mg-30,Mg-32,Mg-34 with deformed quasiparticle random-phase approximation

초록

Gamow-Teller (GT) strength distributions of Mg isotopes are investigated within a framework of the deformed quasiparticle random-phase approximation. We found that the N = 20 shell closure in Mg-28 similar to 34 was broken by the prolate shape deformation originating from the fp-intruder states. The shell closure breaking gives rise to a shift of low-lying GT excited states into high-lying states. Discussions regarding the shell evolution trend of single-particle states around N = 20 nuclei are also presented with the comparison to other approaches.

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