S-Pb and S-S interactions at 200 A GeV/c, as measured by the NA36 expe
riment at CERN, have been classified according to the number of partic
ipant protons of the projectile, by means of a precise identification
of the charge of the projectile fragment produced. Rapidity and transv
erse momentum spectra of pi(-) associated with the production of Z = 1
0 to Z = 15 projectile fragments are presented and compared to three m
odels with different mechanisms of final particle production.