Backward emission of energetic protons

Inclusive cross sections for energetic protons emitted at backward angles were measured using a 200 MeV proton beam bombarding $^{6}\mathrm{Li}$,$^{27}\mathrm{Al}$, $^{58}\mathrm{Ni}$, and $^{197}\mathrm{Au}$ targets. The data were analyzed using the quasi-two-body scaling approach. It is shown that a scaling regime is reached for some of the data taken at incident energies of about 200 MeV/nucleon. This regime, however, is different from the one observed above 600 MeV/nucleon.