Abstract
Lifetime measurements have been performed for the 5 2 − [532] intrinsic state in the Tb isotopes with A = 155, 157, 159 and 161. The rates of the ∥ ΔK∥ = 1, E1 transitions in these isotopes, as well as in 153Eu and 155Eu, are discussed. With the Nilsson model as a starting point, the effects of pairing correlations and Coriolis coupling are calculated. It is found that these effects are not sufficient to account for the essential features of the experimental results. It is suggested that dipole contributions arising through octupole excitations are of importance.
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