New inelastic process of phonon scattering by rotons
L. A. PogorelovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , Khar’kovВ. И. СоболевPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , Khar’kov
ABI
Abstract
A new inelastic process has been discovered that determines the kinetics of superfluid helium at elevated pressures. The process involves absorption (emission) of phonons by rotons owing to the dispersion of the roton energy. Rotons moving at maximum velocity are shown to play an essential role in this process. The form of the roton dispersion relation proposed permits a good description of the kinetic processes and the results of direct measurements of the energy spectrum.
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