Abstract
Gamma-ray decays from states in 129Ce have been studied using 16O-induced reactions on 116Sn and 117Sn targets. Previously known positive- and negative-parity bands have been extended to spins of 31/2 and 39/2, respectively. Band crossings are seen for the first time in 129Ce and occur near the same rotational frequency as the h112/ proton band crossing in 130Ce. The signature splittings in the bands are discussed in terms of the cranked shell model with a prolate deformation epsilon 2=0.25. The data show that the one-quasiparticle bands based on the h11/2 (523) 7/2 Nilsson orbit have gamma approximately -15 degrees (signature alpha =+1/2) and gamma approximately -30 degrees ( alpha =-1/2). After the band crossing, the three-quasiparticle bands (including two h11/2 quasiprotons) have gamma approximately 0 degrees for both signatures. The positive-parity states corresponds to gamma approximately 0 degrees for both the one-quasiparticle and three-quasiparticle bands. The branching ratios have been used to deduce the ratio (gK-gR)/Q0 as a function of rotational frequency. This ratio shows an increase when the backbending takes place.
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