Abstract
The double differential cross-section for pion electroproduction was measured for the processes p(e,π+n and12C(e,π+)12B. The proton-induced cross-section was evaluated by using the virtual-photon concept. The experimental data were used to test different formulae for the virtual-photon spectrum. We found significant deviations to a generally used formula (Dalitz-Yennie) and good agreement with a new formula (Tiator-Wright). In addition, we have measured pion production crosssections with real photons under equal kinematic conditions. Electro-and photoproduction measurements give the same results.
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