An expression for the coefficient of giant quantum attenuation of sound is obtained, which includes the effects of both the fluctuation of the gas-liquid transition and the impurity scattering. The observed anomalous temperature dependence of the peak value of attenuation of sound is explained by the present theory as the effect of the fluctuation of the gas-liquid type transition, the critical temperature of which is calculated to be around 0.2 K. Other aspects of the experiment are also compared with the present theory. The behavior of the system below the critical temperature is discussed.
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Daijiro Yoshioka (1978) studied this question.
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