The isotope dependence in the angular distribution of electron-capture cross sections for protons and deuterons with equal velocity (E=40 keV/u) colliding with atomic hydrogen or deuterium targets is predicted theoretically and observed experimentally. A projectile-dependent effect is observed at small scattering angles. No target dependence was detected in the differential cross sections. A scaling relationship is determined which permits the prediction of differential cross sections for hydrogen-isotope projectiles.
E. P. Rille et al., "Isotope Effect in Electron-Capture Differential Cross Sections at Intermediate Energies," Physical Review Letters, vol. 49, no. 25, pp. 1819-1822, American Physical Society (APS), Dec 1982.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.49.1819
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