Anharmonic decay of high-energy transverse acoustic (TA) phonons satisfying {}{ω}{}kBT is studied taking account of the elastic anisotropy of real crystalline solids. Dispersive effects are assumed to be small. We find that the decay rate is very anisotropic. The possibility of observing this anisotropy in a phonon-focusing experiment is discussed.
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Tamura et al. (1985) studied this question.
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