Abstract
The onset of solidification of $^{4}\mathrm{He}$ in porous Vycor is identified from changes in transverse sound velocity. From observed overpressures required to initiate freezing (ranging from 18 bars at 1.3 K to 30.7 bars at 2.38 K), the interfacial energy between liquid and solid $^{4}\mathrm{He}$ was estimated. The superfluid transition up to 35.5 bars was also observed.
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