2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41854Charm photoproduction rates off nuclei below the nucleon threshold are estimated using the phenomenologically known structure functions both for $x<1$ and $x>1$. The rates rapidly fall from values of the order 1 nb at the threshold to values of the order 1 pb at 6 GeV for Pb target.5 pages text in LaTex, 3 figures in PSHigh Energy Physics - Phenomenologytext