Abstract
High-spin states in were studied using the Si,3pn) reaction at 120 MeV and the Na,2pn) reaction at 65 and 70 MeV. Prompt and delayed γ-γ coincidences were measured using the Pitt-FSU detector array. Results from these experiments have led to new levels partly grouped into new bands, new spin-parity assignments, and a rearrangement of the low-lying portion of the level scheme. States were observed up to () and () in the lowest energy positive- and negative-parity bands. Spin assignments were based on both directional correlation of oriented nuclei ratios and angular distributions. For some low-lying levels parity assignments were supported by a measurement of the linear polarizations of γ rays. Lifetimes were determined using the Doppler-shift attenuation method and direct timing. A reversal of signature splitting was observed in the yrast band at the state. Large alternations were seen in the B(M1) strengths in the yrast band, while the B(E2) values in the two most strongly populated bands show a considerable collective enhancement. © 1996 The American Physical Society.
- Received 8 May 1996
DOI:https://doi.org/10.1103/PhysRevC.54.1038
©1996 American Physical Society