Eur.Phys.J. A 58, 51 (2022)

C.Delafosse, A.Goasduff, A.Kankainen, D.Verney, L.Al Ayoubi, O.Beliuskina, L.Canete, T.Eronen , R.P.de Groote, M.Hukkanen, F.Ibrahim, A.Illana, A.Jaries, L.Lalanne, I.D.Moore, D.Nesterenko, H.Penttila, S.Rinta-Antila, A.de Roubin, D.Thisse, R.Thoer, G.Tocabens

First trap-assisted decay spectroscopy of the ⁸¹Ge ground state

RADIOACTIVITY ⁸¹Ge(β^-)[from ²³²Th(p, X), E=35 MeV at the IGISOL facility of University of Jyvaskyla, followed by mass and charge separation using double Penning-trap mass spectrometer JYFLTRAP and ToF-ICR]; measured quadrupole excitation frequency, T_1/2 of ⁸¹Ge g.s. decay by growth and decay timing, Eγ, Iγ, βγ-coin, γγ-coin. ⁸¹As; deduced levels, J, π, β feedings, logft, B(GT), doorway configurations. ⁸¹Ge; deduced T_1/2 of only the g.s. as the known isomer in ⁸¹Ge not populated. Comparison of experimental ⁸¹As levels structure with shell-model calculations using JJ44B or JUN45 interactions, and with previous experimental results. Systematics of low-lying states in ^{71,73,75,77,79,81,83}As; and those of the first and second 9/2+ states in ^{71,73,75,77,79,81,83}As, ^{73,75,77,79,81,83,85}Br, and ^{75,77,79,81,83,85,87,89}Rb.

doi: 10.1140/epja/s10050-022-00698-7