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In this paper, a nonrelativistic operator for pion electroproduction from nuclei is presented. It approximates a combination of pseudovector Born plus Δ-resonance diagrams using a method that does not break up the nucleon propagators into their positive and negative energy parts as was done in previous efforts. This result gives an operator that maintains its gauge-invariance cancellations exactly. Comparisons are made with a sample of photoproduction and electroproduction data.

Deuterons from the reaction Li(e, d) e', 'He were measured at eight laboratory angles over a deuteron energy interval of approximately 2 -10 MeV. The incident electron energy was chosen so that only deuterons and a particles were left in the final state. These data are compared to a one-resonance square-well electrodisintegration model. Extracted photodisintegration cross sections are also compared with a more sophisticated Woods-Saxon photodisintegration theory. In both comparisons the data and theory are in overall qualitative agreement.NUCLEAR REACTIONS 6Li(e, d)e', He, measured o(E",O"), E&=2 -10 MeV, extracted Li(p, d) He for E &10 MeV.