Analyzing powers and cross sections are calculated for the ${}_{}{}^{16}{}_{}{}^{}$O(p→,2p) and ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$(p→,2p) reactions at an incident energy of $E_{\mathrm{p}=200\mathrm{}}$ MeV within the framework of the distorted wave impulse approximation, including both the effect of the spin-orbit interaction for the distorted waves and the off-shell effect in the proton-proton scattering. The antisymmetrized t-matrix elements are calculated with the effective nucleon-nucleon interactions by Love and Franey. Our calculations agree well with the experimental data. Although there are substantial contributions from the spin-orbit and the tensor parts in the effective nucleon-nucleon interaction to the cross section, the contribution from the central part is quite weak. Furthermore, we study the medium effects using the density-dependent t-matrix interactions by von Geramb and Nakano. It is found that the medium effects increase the cross sections somewhat, but scarcely change the analyzing powers.

• Received 21 April 1986

DOI:https://doi.org/10.1103/PhysRevC.34.1192