Analyzing power data are reported for exclusive proton-induced proton knockout from the $1s_{1/2}$ states of 10 target nuclei ranging from ${}^2\mathrm{H}$ to ${}^{19}\mathrm{F}$ for an incident energy of 392 MeV. Compared to free proton-proton scattering, the data are significantly suppressed, the amount of suppression increasing monotonically as a function of increasing separation energies for the knocked-out protons. It is also possible to consider that this suppression increases monotonically as a function of the increasing effective mean density for most of the target nuclei, but data for ${}^3\mathrm{He}$ and ${}^4\mathrm{He}$ targets clearly deviate from such systematic change. The data are compared to model predictions based on the nonrelativistic and relativistic distorted-wave impulse approximation. Both relativistic plane wave model and a nonrelativistic distorted-wave model incorporating a relativistic correction associated with an effective nucleon mass predict a significant suppression of the analyzing power, but the magnitude of the suppression is not sufficient to explain the experimental data. However, a relativistic distorted wave model predicts values that are closer to the data, but the result is inconclusive in this work since recoil corrections are neglected.

• Received 24 March 2005

DOI:https://doi.org/10.1103/PhysRevC.72.041602