Proton-Proton Scattering at 10 Mev

Abstract

Differential cross sections have been measured for scattering of 9.69-Mev protons by hydrogen gas, covering the laboratory angular range from 45° to 5°. The angular resolution is ±½° at small angles, and estimated absolute probable errors ±0.7% except at the smallest angles. The interference minimum of 51.4 millibarns occurs at 34° c.m. and the 90° cross section is 54.6 mb. The data can be fit with the following set of phase shifts: ${}_{}{}^1{}_{}{}^{}S_0^{}{}_{}{}^{}=54\mathrm{}°$, ${}_{}{}^3{}_{}{}^{}P_0^{}{}_{}{}^{}=+2.83\mathrm{}°$, ${}_{}{}^3{}_{}{}^{}P_1^{}{}_{}{}^{}=-5.07\mathrm{}°$, ${}_{}{}^3{}_{}{}^{}P_2^{}{}_{}{}^{}=+2.22\mathrm{}°$, ${}_{}{}^1{}_{}{}^{}D_2^{}{}_{}{}^{}=+0.2\mathrm{}°$.