Deformation Dependence of Single Quasiproton States in¹⁷⁷Re

Abstract

High-spin states in 177Re have been populated in the 165Ho (16O, 4n)177Re reaction. A level scheme is constructed from the studies of γγ-coincidences, the relative excitation function, and γ-ray angular distribution measurements. Three decay sequences identified with 5/2+[402], 1/2-[541] and 9/2-[514] Nilsson orbitals have been extended up to spin 29/2+, 49/2- and 33/2-, respectively, and a newly observed sequence based on the 1/2+[660] Nilsson orbital is established. The experimental data are discussed within the Woods-Saxon cranking model. Observed shifts in the band crossing frequencies are interpreted theoretically as being caused by different deformation driving forces of quasiparticle orbitals. B(M1)/Q02 ratios are discussed in connection with quasineutron alignment.