Abstract
The high-spin states of have been investigated using the F, 2pn) reaction at 55 MeV. The positive-parity band has been extended to =29/ and the unfavored signature has been identified. The negative-parity band has been extended to =19/ and band crossings were observed for the first time in both bands. Eleven new lifetimes were measured using the Doppler-shift attenuation method which allowed for extraction of transition strengths and transition quadrupole moments. The B(M1) strengths exhibit a staggering dependent on the signature splitting. Calculations based on the Woods-Saxon-Bogolyubov cranking model explain the signature-dependent alignment process in the bands and predict signature inversion in all bands at high rotational frequencies. It is argued that the data are consistent with the transition from triaxial shapes with γ∼-30°, characteristic of one-quasiparticle configurations, to triaxial shapes with γ∼30°, characteristic of a three-quasiparticle configuration containing one aligned pair of protons.
- Received 31 January 1992
DOI:https://doi.org/10.1103/PhysRevC.46.516
©1992 American Physical Society