Abstract
Dilepton production following radiative capture of a proton on a nuclear target is studied in the impulse approximation. The cross section is decomposed in terms of four time-like nuclear structure functions through a longitudinal-transverse separation of the nuclear current. Using a simple PWIA model, cross sections and conversion factors are calculated for capture reactions p+ n→ d+ e + e −, p+ p→ 2 He+ e + e − and p+ 11 B→ 12 C+ e + e − at proton energies of 100–200 MeV. The result is compared with a recent measurement of the conversion factor for p+ 11B.
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