Geodesic
The experimental investigation of X-ray flow diffracted in the crystal
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (1991), pp. 91-96

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The energy flow of diffracted X-rays in perfect crystals has been investigated experimentally in Bragg case diffraction. It has been shown that besides the diffracted beam two more beams appear, which in case $\mu t=15$ protrude from the frontal side of the crystal. The appearance of these beams is due to penatration of such waves into the crystal, which have a small absorption coefficient and deviate from the right Bragg angle. 
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     title = {The experimental investigation of {X-ray} flow diffracted in the crystal},
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P. A. Bezirganyan; L. G. Gasparyan; V. P. Mkrtchyan; F. Kayialy. The experimental investigation of X-ray flow diffracted in the crystal. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (1991), pp. 91-96. http://geodesic.mathdoc.fr/item/UZERU_1991_2_a12/