Abstract
Excited states in have been investigated via the Si,3pnY and Si,p2nY reactions using beams provided by the Florida State University Tandem-LINAC with energies of 95 to 135 MeV. Particle-γ coincidences with a full-sphere charged-particle detector and an excitation curve were used to assign γ rays to . The Si,p2nY reaction at 95 MeV was used to measure γ-γ coincidences with five Compton-suppressed Ge detectors. Lifetimes in the ns and ps ranges were measured using direct timing and the Doppler-shift attenuation method. A level scheme with 39 states was constructed up to tentative spins and parities of () and (). In the positive-parity yrast band a phase reversal was observed in the signature splitting at I=10ħ. The B(M1) strengths in this band alternate with signature between about 0.1 and 1.0 . The B(E2) strengths of about 90 Weisskopf units are in good agreement with those predicted by Hartree-Fock-Bogolyubov calculations. Particle-rotor calculations indicate a prolate or triaxial core shape for the positive-parity band.
- Received 23 February 1993
DOI:https://doi.org/10.1103/PhysRevC.47.2546
©1993 American Physical Society