Abstract
Levels within three rotational bands in the odd A nuclide 169Yb have been excited in the 167Er(α,2n)169Yb reaction. The positive parity ground-state band is strongly perturbed. The observed energy levels and relative transition rates within this band are compared with the results of a Coriolis coupling calculation. Good agreement is obtained if the theoretical Coriolis coupling strength is reduced for the orbitals close to the Fermi surface. With gs = gsfree and non-adiabatic wavefunctions the experimental E2/M1 mixing ratios are reproduced for the 7/2+ [633] ground-state band. The magnetic moment for the ground-state has been calculated and is compared with the measured one for the isotone 167Er. This comparison indicates that the mechanism which reduces the Coriolis matrix elements may also be effective in preventing interband M1 transitions with |ΔK| = 1. The results of a Coriolis coupling calculation for N = 5 bands are also discussed. The rotational levels in the doubly-even nuclides 168Yb and 170Yb are observed up to the 10+ member.
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