Abstract
High-spin states in 155Dy have been studied by γ-γ coincidence measurements via the 124Sn( 36S, 5n) 155Dy reaction at a beam energy of 155 MeV. Additional information has also been extracted from the reaction 156Gd( 3He, 4n) 155Dy at 39 MeV beam energy. Eight rotational bands have been populated and observed up to high spin (I⩽ 93 2 ) . The band features have been analysed within the framework of the cranked-shell model. The i 13 2 neutron alignments and the h 11 2 proton alignments are discussed. B(M1)/ B(E2) ratios have also been extracted for the strongly coupled bands to deduce further information on the detailed structure of these bands. The highest states (above spin 30) of two of the negative-parity bands gain energy rapidly with respect to a rigid rotor, which is consistent with properties expected for terminating bands.
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