TY - JOUR
T1 - Shape coexistence in the N = 19 neutron-rich nucleus 31Mg explored by β–γ spectroscopy of spin-polarized 31Na
AU - Nishibata, H.
AU - Shimoda, T.
AU - Odahara, A.
AU - Morimoto, S.
AU - Kanaya, S.
AU - Yagi, A.
AU - Kanaoka, H.
AU - Pearson, M. R.
AU - Levy, C. D.P.
AU - Kimura, M.
N1 - Publisher Copyright:
© 2017 The Authors
PY - 2017/4/10
Y1 - 2017/4/10
N2 - The structure of excited states in the neutron-rich nucleus 31Mg, which is in the region of the “island of inversion” associated with the neutron magic number N=20, is studied by β–γ spectroscopy of spin-polarized 31Na. Among the 31Mg levels below the one neutron separation energy of 2.3 MeV, the spin values of all five positive-parity levels are unambiguously determined by observing the anisotropic β decay. Two rotational bands with Kπ=1/2+ and 1/2− are proposed based on the spins and energies of the levels. Comparison on a level-by-level basis is performed between the experimental results and theoretical calculations by the antisymmetrized molecular dynamics (AMD) plus generator coordinate method (GCM). It is found that various nuclear structures coexist in the low excitation energy region in 31Mg.
AB - The structure of excited states in the neutron-rich nucleus 31Mg, which is in the region of the “island of inversion” associated with the neutron magic number N=20, is studied by β–γ spectroscopy of spin-polarized 31Na. Among the 31Mg levels below the one neutron separation energy of 2.3 MeV, the spin values of all five positive-parity levels are unambiguously determined by observing the anisotropic β decay. Two rotational bands with Kπ=1/2+ and 1/2− are proposed based on the spins and energies of the levels. Comparison on a level-by-level basis is performed between the experimental results and theoretical calculations by the antisymmetrized molecular dynamics (AMD) plus generator coordinate method (GCM). It is found that various nuclear structures coexist in the low excitation energy region in 31Mg.
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U2 - 10.1016/j.physletb.2017.01.049
DO - 10.1016/j.physletb.2017.01.049
M3 - Article
AN - SCOPUS:85011296390
VL - 767
SP - 81
EP - 85
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
ER -