Structure of mg isotope studied by β-decay spectroscopy of spin-polarized na isotopes: Shape coexistence in 30mg

Tadashi Shimoda, Kunihiko Tajiri, Atsuko Odahara, Masaki Suga, Noriaki Hamatani, Hiroki Nishibata, Jun Takatsu, Rin Yokoyama, Yoshikazu Hirayama, Nobuaki Imai, Hiroari Miyatake, Mathew Pearson, C. D.P. Levy, K. P. Jackson, Romain Leguillon, Costel Petrache

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Abstract

We have been studying the structure of Mg isotopes in the region of the N = 20 island of inversion, to clarify the structure change as a function of the neutron number. The experiments are being performed by our unique method of β-decay spectroscopy taking advantage of highly-spin-polarized radioactive nuclear beams at TRIUMF. The β-decay asymmetry in the Na-isotope decay enables unambiguous spin-parity assignments of the levels in the daughter Mg isotope, and it becomes possible to compare the experimental data and theoretical predictions on a level-by-level basis. The present paper reports on the results of the β decay of 30Na→30Mg. From the detailed decay scheme of 30Na, it is suggested that the 30Mg levels at 1.788 MeV [(0+2 )], 3.460 MeV [(2)+], 4.967 MeV [1+], and 5.414 MeV [2+] have deformed shapes with intruder configurations, whereas the level at 2.466 MeV [(2+2 )] has different nature both from the spherical ground state and the deformed four levels. It is proposed that the 2+2 level is the band-head of the predicted γ-band.

Original languageEnglish
Pages (from-to)310-315
Number of pages6
JournalProgress of Theoretical Physics Supplement
Issue number196
Publication statusPublished - Nov 6 2012
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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