Test of Time-Reversal Invariance in Electroproduction Interactions Using a Polarized Proton Target

Electrons have been scattered inelastically from an alcohol-water target containing protons polarized normal to the scattering plane. Scattered-electron energies corresponding to the excitation of the 1236-, 1512-, and 1688-MeV nucleon resonances were observed at four-momentum transfers between 0.2 and 0.7 ${(\mathrm{B}\mathrm{e}\mathrm{V}/\mathit{c})}^2$. A search was made for changes in the intensity of the scattered electrons as the target polarization was reversed. None was seen.