2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/202894Quantum filtering of the ejectile wave packet from hard $ep$ scattering on bound nucleons puts stringent constraints on the onset of color transparency in $(e,e'p)$ reactions in nuclei at moderate energies. Based on multiple-scattering theory, we derive a novel formula for nuclear transparency and discuss its energy dependence in terms of a color transparency sum rule.14 pages (LATEX), 3 figures (not included, available from the authors), KFA-IKP(TH)-1992-16Nuclear Theorytext