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Abstract
We have carried out Brillouin scattering experiments in superfluid 3He-4He solutions at six molar concentrations (x = 0.050, 0.100, 0.135, 0.250, 0.398, and 0.606) for temperatures as low as 0.4 K. We have measured the relative scattered intensities from the three normal modes: first sound, second sound, and concentration fluctuations. We have obtained the velocity of high-frequency first sound (~600 MHz), the velocity of high-frequency second sound (~20–80 MHz), and, at low concentrations, rough indications of the damping of the modes. An exact calculation of the scattered intensities is presented and used together with our measured intensities to obtain values for three thermodynamic quantities: ϱ n /ϱ, (∂δ/∂x) P,T , and (∂δ/∂T) P,x .
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