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

摘要

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-gamma-ray angular correlations and total branching ratios were determined from intensity balances in a gamma-gamma coincidence measurement. The electromagnetic properties of the low-lying natural parity states in Yb-171 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 Gd-155,Tm-169 and Yb-171 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. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 35]