Abstract
We report phonon transmission studies of the interface between solid helium and dilute solutions of3He in liquid4He. We have measured the transmission of phonons from the solid into the liquid and the rate of exchange of energy between the phonons in the solid and the3He quasiparticles in the liquid. We compare the results with two theoretical calculations; in the first it is assumed that the interface is atomically rough and mobile; in the second the interface is assumed to be facetted, and therefore immobile. The experimental results indicate strongly that the interface in our experiment is rough. Agreement between theory and experiment is good.
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