2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/228152We investigate the angular distribution of positrons in the coherent process electronpositron pair creation process by high-energy photons in a periodically deformed single crystal with a complex base. The formula for the corresponding differential cross-section is derived for an arbitrary deformation field. The case is considered in detail when the photon enters into the crystal at small angles with respect to a crystallographic axis. The results of the numerical calculations are presented for${\mathrm{SiO}}_{2}$ and diamond single crystals and Moliere parameterization of the screened atomic potentials in the case of the deformation field generated by the acoustic wave of S-type.11 pages, 4 figures, figures and references addedHigh Energy Physics - TheoryOther Condensed MatterAccelerator Physicstext