Cross sections above 0.3 GeV for (p, 2p) reactions ofTi48andGe74

Cross sections for the ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ti}(p, 2p){}_{}{}^{47}{}_{}{}^{}\mathrm{Sc}$ and the ${}_{}{}^{74}{}_{}{}^{}\mathrm{Ge}(p, 2p){}_{}{}^{73}{}_{}{}^{}\mathrm{Ga}$ reactions were measured from 0.3 to 4.6 GeV incident proton energy. A rise in cross section of (25 ± 3)% is observed for each reaction in the energy region from 0.3 to 1.0 GeV. The ($p, 2p$) cross sections for ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ti}$ were found to be systematically about 30% larger than those for ${}_{}{}^{74}{}_{}{}^{}\mathrm{Ge}$. Comparisons with four prior cases are made. The present results are compared to ($p, 2p$) cross section calculations up to 1.0 GeV based on a Monte Carlo intranuclear cascade-evaporation model. The model yields cross sections that are generally a factor of 2 greater than the experimental values.