High-Spin States inTm165

We have studied the properties of the four rotational bands developed in ${}_{}{}^{165}{}_{}{}^{}\mathrm{Tm}$ for high spin values. The ${\mathrm{½}}^{-}$[541] is the only one which does not show the backbending effect. These results are in agreement with other recent experiments showing the role of the $h_{\frac{9}{2}}$ protons in the backbending effect. A strong $\Delta K=3\mathrm{}$ coupling between ${\mathrm{½}}^{+}$[411] and ${\frac{7}{2}}^{+}\mathrm{}\left[404\right]\mathrm{}$ bands has been found.