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VOLUME 38 (1983) | ISSUE 8 | PAGE 386
Emission of phonons into liquid helium
The flux density of thermal energy from a metal film into liquid helium has been measured. Although the propagation of phonons in helium is of a diffusive nature, the ballistic emission law (?Cu-He ~ a(^cu ~ holds at flux densities up to those which would cause the He to boil. The coefficient a is discontinuous near the λ point.