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The high-spin rotational bands in 168Hf and the triaxial bands in Lu nucleiare analyzed using the configuration-constrained Cranked Nilsson-Strutinsky(CNS) model. Special attention is given to the up-sloping extruder orbitals.The relative alignment between the bands which appear to correspond to triaxialshape is also considered, including the yrast ultra-high spin band in 158Er.This comparison suggests that the latter band is formed from rotation aroundthe intermediate axis. In addition, the standard approximations of the CNSapproach are investigated, indicating that the errors which are introduced bythe neglect of off-shell matrix elements and the cut-off at 9 oscillator shells(N_{max}=8) are essentially negligible compared to other uncertainties. On theother hand, the full inclusion of the hexadecapole degree of freedom is moresignificant; for example it leads to a decrease of the total energy of ~ 500keV in the TSD region of 168Hf.

Interpretation of the large-deformation high spin bands in selected A=158-168 nuclei