GCP Code Applied in $J/\psi$ Production and Absorption
  Using the General Cascade Program(GCP), the production and absorption of $J/\psi$ in p-A and A-A collisions have been studied. Nucleon absorption mechanism and comover absorption mechanism are considered to investigate the $J/\psi$ suppression. The results agree well with experimental data of $J/\psi$ production, except for the data in Pb-Pb collision. 
Xiao-Xia Yao, Wei-Qin Chao, and Yang Pang