Abstract
A high resolution magnetic pair spectrometer for medium energy photons has been used for studies of the exclusive ( p, e + e −) and ( p, γ) reactions on deuterium at 98 and 176 MeV. The ( p, e + e −) cross sections, obtained at 40° and 80°, are compared with the corresponding data for the ( p, γ) reaction measured with the same apparatus. At small virtual photon masses the ( p, e + e −) cross sections show significant enhancement over what is expected from model calculations, a behaviour which has earlier been observed also for the 11B( p, e + e −) 12C reaction.
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