Postprint version. Published in Journal of Low Temperature Physics, Volume 61, Issue 5-6, December 1, 1985, pages 447-453.
The definitive version is available at http://dx.doi.org/10.1007/BF00683696.
The first measurements of acoustic reflection, together with acoustic transmission at the solid-liquid interface of 4He, are used to determine the total relative acoustic energy absorption at the interface as a function of temperature. Based on these results, a new mechanism for the temperature dependence of the kinetics of growth and interface mobility is proposed.