Abstract
Using fast heat-pulse techniques, the transmission of ballistic longitudinal (L) and transversal (T) phonons from sapphire into phonon in superfluid He-II at T = 0.23 K has been observed. The intensity ratio of the converted L and T mode in He-II was found to be 0.22 ± 0.02 whereas a value of 0.31 ± 0.01 was obtained for the sapphire crystal.
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