Phys.Rev. C 91, 064317 (2015)

A.Etile, D.Verney, N.N.Arsenyev, J.Bettane, I.N.Borzov, M.C.Mhamed, P.V.Cuong, C.Delafosse, F.Didierjean, C.Gaulard, Nguyen Van Giai, A.Goasduff, F.Ibrahim, K.Kolos, C.Lau, M.Niikura, S.Roccia, A.P.Severyukhin, D.Testov, S.Tusseau-Nenez, V.V.Voronov

Low-lying intruder and tensor-driven structures in ⁸²As revealed by β decay at a new movable-tape-based experimental setup

RADIOACTIVITY ⁸²Ge(β^-)[from ²³⁸U(e, F), E=50 MeV followed by online mass separation using PARRNe mass separator at ALTO ISOL facility of IPN-Orsay]; measured Eγ, Iγ, βγ-, γγ-coin, half-life of ⁸²Ge isotope using BEDO detector assembly. ⁸²As; deduced levels, J, three potential 1+ states, π, β feedings, logft. Comparison with experimental and theoretical values of two 1+ states in ⁸²As and ⁸⁰Ga. Comparison with empirical core-particle coupling model and fully microscopic treatment within Skyrme-QRPA (quasiparticle random-phase approximation) approach. Discussed Gamow-Teller fragmentation due to tensor correlations and couplings to 2p-2h excitations. ⁸²Ga(β^-); measured half-life from growth-decay curve for 1348-keV γ ray, and compared with earlier experimental value. ^81,82,82mAs, ^81,81mGe, ⁸²Ga, ^130,132Sb, ¹³²Sn(β^-), ⁸²Ga(β^-n); observed γ rays from fission fragments present in the sample.

NUCLEAR STRUCTURE ⁸¹Ga, ⁸³As, ⁸⁵Br, ⁸⁷Rb; calculated proton QP energies, occupation probabilities. ⁸⁰Ga, ⁸²As, ⁸⁴Br, ⁸⁶Rb; calculated unperturbed energies of neutron-proton 2-qp states. ⁸¹Ge, ^82,83As, ⁸⁵Kr, ^86,87Rb; calculated levels, J, π. ⁸⁰Ga, ⁸²As; calculated energies and structures of the QRPA dipole (1+) neutron-proton 2-qp states. Comparison with experimental data. Empirical core-particle coupling model and fully microscopic treatment within Skyrme-QRPA approach.

doi: 10.1103/PhysRevC.91.064317