Lateral ejection of low energy protons in high energy heavy-ion collisions.

Abstract

We study the angular distributions of low energy protons for various multiplicity cuts in ${E}_{L}$=0.8 GeV/nucleon heavy nuclear collisions in terms of the nuclear cascade model. The differential cross sections for low energy protons (${E}_{c}$100 MeV, with ${E}_{c}$ being the proton energy in the center-of-mass frame) in the lateral direction move up relatively with respect to those in the forward direction as the multiplicity cut increases. For the case of La+La collisions, for example, the differential cross section becomes maximum at ${\ensuremath{\theta}}_{c}$=90\ifmmode^\circ\else\textdegree\fi{} above the multiplicity cut M60.