Differential cross sections for electron capture in collisions between protons and hydrogen atoms have been experimentally determined for incident proton energies of 25, 60, and 125 keV in the center-of-mass scattering-angle range of 0-3 mrad. The experimental results compare more favorably with the results of both a multistate and a two-state calculation than with the results of a continuum distorted-wave-approximation calculation. There is no evidence of a Jackson-Schiff-type minimum.
P. J. Martin et al., "Electron Capture at Very Small Scattering Angles from Atomic Hydrogen by 25-125-keV Protons," Physical Review A, vol. 23, no. 6, pp. 3357-3360, American Physical Society (APS), Jun 1981.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevA.23.3357
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