Abstract
High-spin levels in Ce and Nd isotopes excited by the reactions 120,122Sn( 16O, 3n) 133, 135Ce and 122, 124Te( 16O, 3n) 135, 137Nd have been studied by in-beam γ-ray spectroscopic methods (prompt and delayed spectra, excitation functions, angular distributions and γ-γ coincidences). Bands built on the 11 2 − isomeric levels in 135Ce and 137Nd and on the 9 2 − ground states in 133Ce and 135Nd have been found. A prolate deformation is required for these nuclei in order to explain the E2/M1 mixing ratios and the level ordering of these bands.
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