Phonon-Quasiparticle Interactions in Dilute Solutions of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>in Superfluid<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>: III. Attenuation of First Sound Above 0.2°K
Gordon BaymDepartment of Physics, University of Illinois, Urbana, IllinoisW. F. SaamDepartment of Physics, University of Illinois, Urbana, IllinoisC. EbnerDepartment of Physics, University of Illinois, Urbana, Illinois
1968lv
ABI
Annotatsiya
Utilizing a previously developed phonon Boltzmann equation we extend to higher temperatures an earlier calculation of first sound attenuation in dilute solutions of ${\mathrm{He}}^{3}$ in superfluid ${\mathrm{He}}^{4}$. The present calculation takes into account thermal phonon-${\mathrm{He}}^{3}$ scattering and is valid up to about 0.7\ifmmode^\circ\else\textdegree\fi{}K. The results are in good overall agreement with experiment.
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