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Frontier Issues in Physics of Exotic Nuclei : Proceedings of the Yukawa International Seminar 2011 (YKIS2011) and Long-Term Workshop on Dynamics and Correlations in Exotic Nuclei (DCEN2011), Kyoto : Japon (2011)
Structure of Mg Isotope Studied by beta-Decay Spectroscopy of Spin-Polarized Na Isotopes
T. Shimoda, K. Tajiri, A. Odahara, M. Suga, N. Hamatani, H. Nishibata, J. Takatsu, R. Yokoyama, Y. Hirayama, N. Imai, H. Miyatake, M. Pearson, C. D. P. Levy, K. P. Jackson, R. Leguillon1, C. Petrache1

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 beta-decay spectroscopy taking advantage of highly-spin-polarized radioactive nuclear beams at TRIUMF. The beta-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 beta decay of Na-30 -> Mg-30. From the detailed decay scheme of Na-30, it is suggested that the Mg-30 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 gamma-band.
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Physique/Physique Nucléaire Expérimentale