DIFFRACTION OF MOSSBAUER-RADIATION UNDER ULTRASONIC EXCITATION OF CRYSTALS

The influence of high-frequency ultrasonic (US) waves on the diffracti on of Mossbauer gamma quanta in perfect and mosaic Si crystals is stud ied. Depending on the US amplitude, a strong decrease and oscillation of the elastic component of the Bragg intensity have been observed in the perfect Si crystal. In the mosaic crystal the variation in the Bra gg intensity is essentially weaker. The oscillations of elastic scatte red intensity are similar for transverse and longitudinal US waves and for surface acoustic waves as well.