Elastic Electron-Proton Scattering Cross Sections Measured by a Coincidence Technique

We have measured elastic electron-proton scattering cross sections in the range of four-momentum transfers from 7 ${\mathrm{F}}^{-2\mathrm{}}$[0.27 ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$] to 150 ${\mathrm{F}}^{-2\mathrm{}}$ [5.84 ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$] and at scattered electron angles of between 20° and 34° in the laboratory. The estimated errors in the cross sections range from ±2.1% at the lowest momentum transfer to ±9.6% at the highest. Both the scattered electron and the recoil proton were detected, resulting in an overdetermination of the kinematics. When the constraint of a coincident proton is removed, there is no significant change in the estimated cross sections.