Abstract
The intensities of neutron Bragg diffracted from the front- and back-faces of a 22 mm thick perfect Ge single crystal undergoing on ultrasound excitation has been measured and calculated theoretically. It is shown that at the same time as the acoustic wave amplitude is increased, the main Bragg peaks grow and the back-face peak becomes asymmetric and tends to disappear. Such a back-face scattering was observed for the first time and successfully described within frameworks of the dynamic theory of neutron scattering modified in the presence of ultrasound excitation and Kato’s quasiclassical approximation taking into account new ultrasonic extinction length appearance.
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