Jacob, Maris, Schneider, and Teodoro have suggested that spin-orbit coupling in nuclei, combined with absorption in ($p,2p$) reactions, will select nuclear protons with a given polarization resulting in $j$-dependent ($\overrightarrow{\mathrm{p}},2p$) cross sections. Using a 200-MeV polarized proton beam at TRIUMF we have observed an asymmetry which has the expected $j$ dependence and agrees with the predictions of a distorted-wave impulse-approximation calculation.

• Received 30 June 1976

DOI:https://doi.org/10.1103/PhysRevLett.37.1600