The differential cross section for proton-proton scattering has been measured for 23 center-of-mass angles from 10° to 90°, with ±0.8% absolute probable error at angles greater than 14°. The incident proton energy was 25.63-Mev lab. The 90° cross section is 18.59 millibarns, and the interference minimum of 17.09 mb occurs at 24° c.m. A set of phase shifts which fit the data are: ${}_{}{}^1{}_{}{}^{}S_0^{}{}_{}{}^{}$, 49.5°; ${}_{}{}^3{}_{}{}^{}P_0^{}{}_{}{}^{}$, 8.2°; ${}_{}{}^3{}_{}{}^{}P_1^{}{}_{}{}^{}$, -4.2°; ${}_{}{}^3{}_{}{}^{}P_2^{}{}_{}{}^{}$, 2.0°; ${}_{}{}^1{}_{}{}^{}D_2^{}{}_{}{}^{}$, 0.62°.

• Received 28 December 1959

DOI:https://doi.org/10.1103/PhysRev.118.1080