Abstract
An experiment has been performed to detect the $\ensuremath{\alpha}$ emission mode in ${}^{178}\mathrm{Hf}{}^{m2}$ isomer decay and a partial half-life of $(2.5\ifmmode\pm\else\textpm\fi{}0.5)\ifmmode\times\else\texttimes\fi{}{10}^{10}$y was measured. It was concluded that $\ensuremath{\alpha}$ decay is strongly retarded by the centrifugal barrier arising due to the high spin of this isomeric state. Additional analysis shows, however, that the $K$-hindrance in this $\ensuremath{\alpha}$ decay is relatively weak, despite the strong manifestation of spin-hindrance.
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