Abstract
The influence of the ultrasonic wave on the dynamic diffraction of the Mossbauer γ quanta in the perfect Si crystals has been studied. Both the scattering intensities and the diffractional Mossbauer spectra for different reflections and ultrasonic frequencesνs have been measured. Some unusual results such as the enhancement of the elastic scattering at highνs with ultrasound amplitude growing and non-exponential decrease of the Debye-Waller factor (connected with ultrasonic phonons) at lowνs have been obtained. The experimental data are in good agreement with the theoretical calculations.
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