β-Decay of 76Rb and the level structure of 76Kr

Abstract The β-decay of mass-separated 76 Rb and the 78 Kr( 4 He, 6 He) reaction at E lab = 102.7 MeV were used to investigate levels in 76 Kr. Based on these data and published results from in-beam and (p, t) studies, a decay scheme for 76 Rb was constructed which incorporates 38 transitions and 16 excited levels in 76 Kr. The decay data strongly suggest a J π of 1 − for the ground state of 76 Rb rather than the accepted assignment of 1 + . Nilsson-model calculations were made with several combinations of neutron and proton configurations that reproduce J π = 1 − and the experimental magnetic moment for 76 Rb.