Abstract
Lack of specific Nilsson states with low $K$ value for assignment of rotational bands observed in ${\mathrm{Hf}}^{177}$ and ${\mathrm{Hf}}^{181}$ between 1 and 2 MeV, together with cross-section measurements, suggest fragmentation of bands into a large number of vibrational components. It is suggested that the previously unobserved pairing vibrations, the $\ensuremath{\beta}$ vibrations, and the more common $K\ensuremath{-}2$ gamma vibrations may be responsible.
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