: We report the experimental measurements on the multiplicity of slow target associated particles, in the forward (θlab≤ 90°) and backward (θlab > 90°) hemispheres, and the different correlations between the backward slow protons and the production of hadrons in both hemispheres in the interactions of 6Li(3.7 A GeV) and 7Li(2.2 A GeV) with emulsion nuclei. The study of the number of backward slow protons (Nbb and Nbg) indicates that while the number of backward black particles, Nbb, is a good factor representing the purely target fragments, the number of backward grey particles, Nbg, can be considered as an accurate experimental factor for the impact parameter dependence of the collision. It is also shown that the most central collisions are events having Nbg > 0 and Nbs > 0. We confront the data with a multiple scattering model incorporating both binary cascading and evaporation of residual nucleus. The model applies well in the region of limited cascading (backward hemisphere). As for the forward hemisphere, where cascading becomes more branched, the model becomes less applicable