Measurement of the Induced Proton PolarizationPnin theC12(e,e′p→)Reaction

The first measurements of the induced proton polarization $P_n$ for the ${}^{12}\mathrm{C}\left({e,e}^{\prime }\overrightarrow{p}\right)$ reaction are reported. The experiment was performed at quasifree kinematics for energy and momentum transfer $(\omega ,q)\approx$ (294 MeV, 756 MeV/c) and sampled a missing momentum range of 0–250 MeV/c. The induced polarization arises from final-state interactions and for these kinematics is dominated by the real part of the spin-orbit optical potential. The distorted-wave impulse approximation provides good agreement with data for the ${1p}_{3/2}$ shell. The data for the continuum suggest that both the ${1s}_{1/2}$ shell and underlying $\ell >1\mathrm{}$ configurations contribute.