2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/38248The PXR spectral-angular and angular distributions in Si and LiH crystals for Bragg geometry are presented. PXR for both the forward and backward diffraction is studied. It is shown that for Bragg geometry the contributions of both the slow and the fast waves in radiation intensity are comparable and only their joint account allows to describe the experimental results. The comparison of theory and experiment is carried out.LaTeX, 20 pages with 16 (.eps) figuresHigh Energy Physics - Experimenttext