We present measurements of the angular distribution of fast hydrogen atoms formed by electron capture of 2.8- and 5.0-MeV protons in atomic hydrogen. In the angular region of the Thomas peak (0.47 mrad) the experimental results obtained with this pure three-body collision system are in reasonable agreement with a strong-potential Born calculation and the impulse approximation, but not with other higher-order theories.
H. G. Vogt et al., "Experimental Test of Higher-Order Electron-Capture Processes in Collisions of Fast Protons with Atomic Hydrogen," Physical Review Letters, vol. 57, no. 18, pp. 2256-2259, American Physical Society (APS), Nov 1986.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevLett.57.2256
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