2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/105955We report on the recent progress in the investigation of the influence of hyperacoustic vibrations on the coherent electron-positron pair creation by high-energy photons in crystals. In dependence of the values for the parameters, the presence of the deformation field can either enhance or reduce the cross-section. This can be used to control the parameters of the positron sources for storage rings and colliders.6 pages, 6 figures, talk presented at the First International Congress of Armenian Physicists, 11-15 September, 2005, Yerevan, ArmeniaHigh Energy Physics - Theorytext