Proton-Proton Scattering at 25 Mev

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: ¹S₀, 49.5^∘{}; ³P₀, 8.2^∘{}; ³P₁, -4.2^∘{}; ³P₂, 2.0^∘{}; ¹D₂, 0.62^∘{}.