High-spin states have been studied in the neutron-deficient odd-N Ce127 and Ce129 isotopes, produced in Mo100(S32,5nγ) and Mo100(S34,5nγ) reactions, using the Euroball and Eurogam γ-ray spectrometers, respectively. A quadruples analysis (γ4) of the coincident γ-ray data has established new band structures in Ce127,129 and extended the known bands to higher spin. In addition, links have been established between two positive-parity bands in Ce127 allowing a reassignment of Iπ=1/2+ to the ground state of this nucleus. Configuration assignments are made by comparison of band properties with cranked Woods-Saxon calculations and systematics of other light odd-N cerium isotopes. Unusually large signature splitting in the negative-parity bands is discussed in terms of nonaxial nuclear shapes induced by the core-polarization effects of h11/2 neutrons.
ASJC Scopus subject areas
- Nuclear and High Energy Physics