2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47823Using the General Cascade Program(GCP), the production and absorption of $J/ψ$ in p-A and A-A collisions have been studied. Nucleon absorption mechanism and comover absorption mechanism are considered to investigate the $J/ψ$ suppression. The results agree well with experimental data of $J/ψ$ production, except for the data in Pb-Pb collision.17 pages, revtex, 6 figuresHigh Energy Physics - Phenomenologytext