Critical Sound Absorption in Xenon

Ultrasonic attenuation in Xe has been measured along a near-critical isochore at frequencies in the range 0.4-5 MHz and at temperatures above ${T}_{c}$. Hypersonic attenuation values obtained from Brillouin linewidths are also cited. It is shown that the critical attenuation per wavelength depends on temperature and frequency through a single reduced variable ${\ensuremath{\omega}}^{*}=\frac{\ensuremath{\omega}}{{\ensuremath{\omega}}_{\mathrm{D}}}$, where the characteristic frequency ${\ensuremath{\omega}}_{\mathrm{D}}=(\frac{2\ensuremath{\Lambda}}{\ensuremath{\rho}{C}_{p}}){\ensuremath{\xi}}^{\ensuremath{-}2}$. The experimental results are compared with numerical calculations based on a recent theoretical formulation by Kawasaki.

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