The attenuation of sound and the phonon spectrum in 3He–4He solutions
I. N. AdamenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovÉ. Ya. Rudavskiı̆Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. I. TsyganokPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. К. ChagovetsPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI
Abstract
An analysis is carried out of the dispersion of the phonon spectrum in solutions with 3He concentrations 0.15, 0.5 and 1% at the saturation vapor pressure and at elevated pressures, on the basis of measurements made of the attenuation of first sound in 3He–4He solutions and the kinetic theory developed for a phonon-impurity system. It was established that the dispersion of the phonon spectrum in the solutions is the same as in pure 4He. This conclusion is also supported by an analysis of other experimental results on the attenuation of second sound, on thermal conductivity, on the velocity of first sound and on the propagation of pulses.
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