Abstract
Cascade and cross-over transitions within the 3/2-[521] and 11/2-[505] bands as well as within a strongly perturbed band with positive parity are observed when high-spin levels in 159Dy are populated in the 158Gd(α,3n)159Dy reaction. The rotational energies and the relative electromagnetic transition probabilities are discussed within the framework of the classical particle rotor model. The irregular structure of the 3/2-[521] band and the positive-parity band can be reproduced to within 0.09 keV and 1.3 keV, respectively, in calculations where the theoretical Coriolis matrix elements are reduced. Furthermore, in these calculations the description of the relative transition probabilities in the positive-parity band is consistent with the calculations performed for 161Dy only if the intraband M1 transitions with ΔK=1 are artificially reduced by the same amount as the matrix elements of the Coriolis force.
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