Abstract
Experimental results are presented for the attenuation of surface acoustic waves on a lithium niobate plate immersed in a bath of liquid helium. The results are compared to theory, and reasonable agreement is found with a model which takes substrate anisotropy into account. The variation in attenuation at the solidification point is discussed in terms of an enhanced transmission due to a transverse mode as well as that expected for a viscoelastic model for solid helium.
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