The longitudinal response function fo the exclusive process ~4He (e,ep)~3H is calculated for the first time in a microscopic way, taking fully and consistently into account the interaction both in the initial and final states. This is accomplished via the Lorentz Integral Transform method[1,2], which requires to solve two non homogeneous Schrodinger-like equations with bound state-like boundary conditions. These equations have been solved within the Correlated Hyperspherical Harmonics expanision method, using the semirealistic MTI-III potential [3]. The reliability of the direct knowck-out hypothesis [4] and also in some non parallel ones. In Fig. 1 we show the effects of the "exchange.
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