High precision absolute differential cross-section measurements for proton-proton elastic scattering at 491.9, 575.5, 641.6, 728.2, and 793.0 MeV.

摘要

The proton-proton absolute elastic differential cross section, (sigma)(sub pp)((theta)), has been measured at incident proton beam energies of 491.9, 575.5, 641.6, 728.2, and 793.0 MeV at laboratory scattering angles of (approximately)15(degree) to (approximately)42(degree) with a total uncertainty on the order of 1%. The measurements were made at the Clinton P. Anderson Los Alamos Meson Physics Facility (LAMPF) and employed a new beam counting technique which provided a better overall beam normalization compared to previous experiments of this type. The cross section was measured with CH(sub 2) targets and a primary liquid, LH(sub 2), target to determine the uncertainties in some systematic corrections. Extreme care was taken to reduce individual systematic errors to less than 0.5%.