Abstract
The elastic proton-helium differential cross section has been determined for incident laboratory energies from 45 to 400 GeV in the range ( by means of the internal-gas-jet-target technique. The differential cross section drops 4-5 orders of magnitude to the first dip at (. The shrinkage in the slope of the differential cross section is found to be twice as fast as that in the proton-proton case. The slope parameter at is described by the formula , where is in ( and is in . The elastic proton-helium cross section is normalized to the known elastic proton-proton cross section using data taken with a helium and hydrogen mixture as a target. The proton-helium total cross section is determined from the optical theorem. The total cross section rises by 4% between 100 and 400 GeV. Results are presented on the real part of the elastic-scattering amplitude and on the total elastic cross section. The experimental differential cross sections are compared to Glauber-model predictions.
- Received 17 June 1980
DOI:https://doi.org/10.1103/PhysRevD.23.1895
©1981 American Physical Society