Magnetic moments in the 1/2-[521] ground-state band of 171Yb and Coriolis-induced renormalization of rotational g-factors in odd-A rare-earth nuclei

Abstract

Gyromagnetic ratios of the states with spins between 7/2- and 21/2- (inclusive) in the 1/2 [521] ground-state band of 171Yb were measured by the transient-field technique following Coulomb excitation. Multipolarity mixing ratios were determined from measured particle-γ-ray angular correlations and total branching ratios were determined from intensity balances in a γ-γ coincidence measurement. The electromagnetic properties of the low-lying natural parity states in 171Yb are compared with particle-rotor calculations and can be well described in the limit of a pure K = 1/2 band. A comparison of measured g-factors in the ground-state rotational bands of 155Gd, 169Tm and 171Yb with particle-rotor model calculations suggests that the renormalization of the rotational g-factor in the low-K, single-quasiparticle bands of odd rare-earth nuclei, compared with their even neighbours, is predominantly due to Coriolis interactions.