Phys.Rev. C 99, 024322 (2019)

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

Structure of ³¹Mg: Shape coexistence revealed by β-ψ spectroscopy with spin-polarized ³¹Na

RADIOACTIVITY ³¹Na(β^-), (β^-n)[from ²³⁸U(p, X), E=500 MeV, followed by high-resolution mass separation and spin-polarization of ³¹Na beam at ISAC-I-TRIUMF facility]; measured β spectra, polarization asymmetry of β particles emitted by the decay of ³¹Na, Eβ, Iβ, Eγ, Iγ, βγ(θ), γ(polarization), βγ- and γγ-coin, half-life of the 50-keV level in ³¹Mg by βγ(t) using thin plastic scintillators for β^- detection and Ge detectors for γ detection at TRIUMF. ³¹Mg; deduced levels, J, π, %β^-n and %β^-2n, deformed rotational bands with Kπ=1/2+ and 1/2-. ³¹Mg(β^-)[from ³¹Na β^- decay]; observed γ rays. Comparison with previous experimental data, and with theoretical calculations. Systematics of energies of the lowest 1/2+, 3/2+, 3/2-, and 7/2- levels in ³¹Mg, ³³Si, ³⁵S, ³⁷Ar, ³⁹Ca.

NUCLEAR STRUCTURE ³¹Mg; calculated levels, J, π using antisymmetrized molecular dynamics (AMD) plus generator coordinate method (GCM), and shell model with the EEdf1 interaction, microscopically derived from chiral effective field theory. Comparison with experimental data.

COMPILATION ³¹Mg; compiled and discussed experimental and evaluated data for levels, J, π from 1984 to 2013.

doi: 10.1103/PhysRevC.99.024322