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Differential cross sections for the scattering of protons by protons have been measured at energies of 1.397, 1.855, and 2.425 Mev over an angular range from 12° to 90° in the center-of-mass system. Total uncertainties vary from about ±0.1% at large angles to ±0.3% at the smallest angles. A thorough investigation of sources of error has yielded cross-section values in disagreement with previously published values. A simple phaseshift analysis has been made. Without the inclusion of vacuum polarization contributions, a satisfactory fit is not obtained with only S-wave and effective nuclear P-wave phase shifts. With their inclusion, the data are fitted well by pure 5-wave nuclear scattering. An upper limit on the magnitude of the effective nuclear P-wave phase shift is estimated at about 0.02° at these energies.

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