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High-spin spectroscopy on odd-odd 164 Tm has produced new illustrations of departures from the predictions of principal-axis cranking. Among the nine strongly coupled rotational bands observed, four are assigned to the parallel and antiparallel couplings of two configurations h 11/2 i 13/2 and g 9/2 i 13/2 . This represents the first time that the high-spin properties of both couplings can be explored. We find that the measured B(M 1)/B(E2) values in the Kϭ1(↑↓) coupling of h 11/2 i 13/2 are 50% larger than those in the Kϭ6 ͑↑↑͒ coupling, and represent the largest seen in this nucleus. Tilted-axis cranking calculations successfully explain the M 1/E2 ratios in these two bands, while the particle-rotor calculations did not reproduce the full low-K enhancement. No inversion in the signatures of the Kϭ6h 11/2 i 13/2 band is observed, but there is a small inversion in the Kϭ1 coupling up to Iϭ17ប and a large inversion in the h 9/2 i 13/2 band up to Iϭ19ប. Remarkably, particlerotor calculations with a p-n interaction included are able to reproduce these inversions. A stronger p-n interaction is needed to explain an inversion in the d 3/2 i 13/2 band.

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