Phonon-Quasiparticle Interactions in Dilute Solutions ofHe3in SuperfluidHe4. II. Phonon Boltzmann Equation and First Viscosity

Abstract

We construct the phonon Boltzmann equation taking into account previously calculated phonon-${\mathrm{He}}^3$ scattering and absorption processes; when phonon-phonon interactions can be neglected this equation is exactly soluble. The first viscosity of solutions containing 1.3 and 5% molar concentrations of ${\mathrm{He}}^3$ is calculated from this equation for $T\lesssim 0.6$°K.