Nuclear structure of odd-odd Y82

Excited states in Y82 have been investigated via the Ni58(28Si,3pn)82Y and Fe56(29Si,p2n)82Y 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 Y82. The Fe56(29Si,p2n)82Y 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 (15-) and (21+). In the positive-parity yrast band a phase reversal was observed in the signature splitting at I=10Latin small letter h with stroke. The B(M1) strengths in this band alternate with signature between about 0.1 and 1.0 μN2. 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.