Structure of ^<28>Mg studied by β-decay spectroscopy of spin-polarized ^<28>Na : The first step of systematic studies on neutron-rich Mg isotopes
type:学術雑誌論文 Journal Article
As the first step of systematic studies on neutron-rich Mg isotopes, the structure of ^<28>Mg has been investigated by β-decay spectroscopy of spin-polarized ^<28>Na at TRIUMF. Spin-parity assignments have been successfully performed for levels in ^<28>Mg by taking advantage of the anisotropic β decay. Previous assignments for three levels were reconfirmed. New assignments were performed for four levels including a newly found ^<2>+ level at 7.461 MeV. The experimental results were compared, on a level-by-level basis, with the shell-model calculation in the model space restricted to the sd shell. Overall good agreement between the experimental and theoretical results indicates dominance of the normal configurations in most of the ^<28>Mg levels. High performance of the present method promises successful application to heavier Mg isotopes to elucidate the shell evolution in the region of the N=20 island of inversion.
- Physical Review C
Physical Review C 85 (3), 034310-, 2012-03-13
American Physical Society