2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/197785We calculate spectrum of diffractively produced gluons in onium-heavy nucleus collisions at high energies. We show that it exhibits a characteristic dependence on nucleus atomic number A and energy/rapidity. We argue that this dependence offers a unique possibility for determining the low-x structure of nuclear matter. Applications to RHIC, LHC and EIC experimental programs are discussed.18 pages, 4 figs; discussion of Eqs.(17)-(19) addedHigh Energy Physics - Phenomenologytext