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Hydrogen formation has been observed following proton impact on positronium. This is the first observation of charge exchange involving a positronium target. The cross section for hydrogen formation has been experimentally determined at proton energies of 11.3, 13.3, and 15.8 keV. Values of σH0ex0ex=0ex0ex26(±9), 7.8(±2.3), and 7.6(±4.4)×10^-16cm² were obtained, in reasonable agreement with recent calculations.
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Merrison et al. (1997) studied this question.
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