Structure of the neutron-rich nucleus Mg 30

H. Nishibata, K. Tajiri, T. Shimoda, A. Odahara, S. Morimoto, S. Kanaya, A. Yagi, H. Kanaoka, M. R. Pearson, C. D.P. Levy, M. Kimura, N. Tsunoda, T. Otsuka

Research output: Contribution to journalArticlepeer-review

Abstract

Structure of the neutron-rich nucleus Mg30, which is located close to the region of the N=20 "island of inversion,"has been investigated by β-γ spectroscopy of spin-polarized Na30. From the detailed γ-γ coincidence relations, nine new states have been established in Mg30. The spin-polarization of Na30 enabled firm spin-parity assignments for seven states in Mg30 by means of the spatial asymmetry of β-ray counts in coincidence with the Mg30γ rays. Based on the experimental information, it is shown that various characteristic structures coexist in Mg30: (i) the ground-state vibrational-like band, (ii) the deformed band built on the 02+ state at 1.788 MeV, (iii) the γ-vibrational band built on the 23+ state at 3.543 MeV, and (iv) four states around 5 MeV associated with large β-transition probabilities: 1+ and 2+ states with spherical nature, 1+ and 2+ states with collective nature. The experimental results are compared with three theoretical calculations of the CHFB + LQRPA, the AMD + GCM, and the large-scale shell model with the EEdf1 interaction. All these theories reasonably reproduce the three bands.

Original languageEnglish
Article number054327
JournalPhysical Review C
Volume102
Issue number5
DOIs
Publication statusPublished - Nov 25 2020
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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