Excited states in Y have been investigated via the Ni( Si, 3pn) Y and Fe( Si,p2n) Y reactions using beams provided by the Florida State University Tandem-LINAC with energies of 95 to 135 MeV. Particle-p coincidences with a full-sphere charged-particle detector and an excitation curve were used to assign p rays to Y. The Fe( Si,p2n) Y reaction at 95 MeV was used to measure p-p 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 = 105. The B(M1) strengths in this band alternate with signature between about 0.1 and 1.0 p~. 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. PACS number(s):
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