Elastic angular differential cross sections for small-angle scattering of protons by atomic hydrogen have been measured. The technique utilized unambigously distinguishes the elastically and inelastically scattered ions. The cross sections fall monotonically by 3 orders of magnitude in the angular range from 0.5 to 3.0 mrad, in the center-of-mass system. The experimental data obtained are in very good agreement with a multistate calculation and in fair agreement with both our Glauber-approximation and classical-trajectory Monte Carlo results.
E. P. Rille et al., "Elastic Differential Cross Sections for Small-Angle Scattering of 25-, 40-, and 60-keV Protons by Atomic Hydrogen," Physical Review A, vol. 29, no. 2, pp. 521-524, American Physical Society (APS), Feb 1984.
The definitive version is available at https://doi.org/10.1103/PhysRevA.29.521
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