ANOMALOUS 4 AND 5 QUASI-PARTICLE ISOMER DECAYS IN HF-174 AND HF-175

High-spin isomeric decays in Hf-174 and Hf-175 are found to populate a large number of different quasiparticle structures. Many weak gamma-r ay transitions are revealed that violate the usual K-selection rules, Analysis of transition hindrance factors shows the importance of K-mix ing in the populated levels. The effects of both chance near-degenerac ies and Coriolis coupling are separately identified. The role of high- K components in Fermi-aligned ''tilted'' bands is emphasized. The 4-qu asiparticle excitation energies are compared with the sum of the const ituent 2-quasiparticle energies.