Abstract
Kinematic singularities in certain few-body reactions may provide special features that are both conceptually simple and observable. Particle transfer is such a reaction. At high velocities, it is characterized by singularities that are manifested by peaks and ridges in differential cross sections. For electrons captured by protons, some of these singular features have been observed. For capture by positrons, i.e. positronium formation, new features are predicted.
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