Protons of the internal circulating beam of the Bevatron were scattered in a polyethylene target.
Both scattered and recoil protons were detected by scintillation counters at angles which define
elastic proton-proton events. An internal counter was located within a few inches of the beam to
permit measurements at laboratory scattering angles as low as 2°. Absolute values are based on the
calibration of the induction electrode that monitors the circulating beam. Total elastic cross
sections obtained by integrating the differential spectra are 17, 10, and 8 mb at 2.24, 4.40, and
6.15 Bev, respectively. The experimental angular distributions are consistent with the prediction
of a simple optical model with a complex index of refraction at short range.
Work done under the auspices of the U.S. Atomic Energy Commission
Approved for public release; distribution is unlimited.