Charged-particle exclusive analysis of central Ar + KCl and Ar + Pb reactions at 1.8 and 0.8 GeV/nucleon

An event by event analysis is carried out for all charged particles observed in central collisions of ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$ + KCl and ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$ + Pb at 1.808 and 0.772 GeV/nucleon, respectively. Total transverse energy is used for impact parameter selection within the central trigger condition. The central Ar + KCl reaction exhibits a forward-backward oriented momentum flux. The flux distribution of the most central Ar + Pb events is approximately isotropic in the fireball center of mass.

NUCLEAR REACTIONS ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$ + KCl, $\frac{E}{A}=1.808\mathrm{}$ GeV, and ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$ + Pb, $\frac{E}{A}=0.772\mathrm{}$ GeV. Central collision trigger, all charged particles measured event by event, streamer chamber. Momentum flux distribution parameters deduced.