Rotational bands of 159Dy Original Research Article

High-spin states of 159Dy have been studied by using reaction 150Nd(13C, 4n). Two rotational bands based on the configurations ν[521]3/2 and ν[642]5/2 have been extended to 57/2− and 61/2+ states, respectively. A neutron AB crossing has been observed around ℏω=0.26 MeV in the ν[521]3/2 band. It has been observed that the signature splitting is inverted after the band crossing in the ν[521]3/2 band. The first band crossing has been observed around ℏω=0.38 MeV in the ν[642]5/2 band. Seven E1 transitions from the ν[521]3/2 band to the ν[642]5/2 band have been observed and discussed on the base of Generalized Intensity Relation. It is found that the B(E1)/B(E2) ratios for 47/2− and 43/2− states become enhanced relatively to those for the lower-spin states.