Abstract
High-spin levels in 129, 131Ce have been produced by the reactions 116, 118Sn( 16O, 3n) 129, 131Ce and studied by in-beam γ-ray spectroscopic techniques. Two strongly populated band structures are observed. The odd-parity levels based on a 9 2 − state constitute a system explained in the triaxial-rotor-plus-particle model as the result of the coupling of an h 11 2 neutron-hole to a prolate-type triaxial core. The even-parity band built on a 7 2 + state corresponds to collective excitations associated with a neutron-hole in the g 7 2 shell. Backbending effect observed in the yrast cascade is discussed.
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