Abstract
The hypersonic attenuation of longitudinal and transverse modes in niobium is observed throughout the mixed state. The field dependence of the attenuation is shown not to be directly dependent on the normal state volume in the mixed state. The transverse and longitudinal attenuation have similar field dependences with the longitudinal mode coupling more strongly than the transverse mode to the vortices. The frequency and conductivity dependence of the phonon attenuation in the Meissner state exhibits features which are not strictly similar to the behavior of the attenuation in insulators, and might be associated with the coupling of the pair states to the lattice.
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