C. Baglin et al., PSI'-PRODUCTION AND J PSI-PRODUCTION IN P-W, P-U AND S-U INTERACTIONSAT 200-GEV/NUCLEON/, Physics letters. Section B, 345(4), 1995, pp. 617-621
Psi' and J/Psi yields are compared in p-W, p-U and S-U interactions at
200 GeV/nucleon. Their ratio decreases from proton-to sulphur-induced
reactions. it also decreases in sulphur-induced reactions from periph
eral to central collisions. This result could indicate that the Psi' a
nd J/Psi suppression mechanisms have different origins in p- and S-ind
uced reactions.