Rotational bands of 159Dy

Abstract High-spin states of 159 Dy have been studied by using reaction 150 Nd( 13 C, 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 ℏ ω =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 ℏ ω =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.