Phonon and impurity absorption of sound in a dilute solution of 3He in 4He below 0.5 K
V. К. ChagovetsPhysicotechnical 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. A. GoncharovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI
Abstract
A coherent pulse technique is used to study sound absorption and dissipative processes in 4He and in a 3He−4He solution containing 1.5 · 10−33He. It is shown that the temperature dependence of the sound absorption coefficient for 4He is described by a three-phonon process, and for the solution it is described by a viscous relaxation process and a new phonon–impurity relaxation process. The data obtained in the study indicate that the same anomalous dispersion of phonons as in 4He is preserved in the investigated solution.
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