Abstract
With the help of the correlation-function formula given by McLennan, an expression for the viscosity tensor is obtained within the Hartree-Fock approximation using the cubic anharmonic momentum-flux operator. In the Debye approximation for phonons and with a simple expression for relaxation time, solutions are obtained for the coefficients of viscosity at low temperature. These solutions are used to calculate the attenuation of longitudinal and transverse sound waves at 300\ifmmode^\circ\else\textdegree\fi{}K. The calculations are compared with experiment for Ge and Si, and good agreement is found.
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