QUASI-ELASTIC CA-40(E,E') REACTION IN THE TRANSVERSE CHANNEL - NUCLEAR-STRUCTURE EFFECTS

We present a microscopic calculation of the transverse response functi on for the Ca-40(e,e') reaction in the quasielastic domain. Our result s clearly demonstrate the necessity of including RPA correlations if o ne wants to describe correctly both position and shape of the quasiela stic peak. Building upon the RPA results, we then discuss the importan ce of the 2p-2h background, which confirms itself to be the dominant m echanism responsible for achieving agreement between theory and experi ment at the peak and in the higher energy region. Finally, the results are discussed in the context of the latest relativistic calculations and experimental work.