Abstract
We study the effects of medium modifications on the contribution of relativistic two-body meson exchange and isobar currents and real-pion production currents to the transverse response function of nuclei. In particular the consequences of rescattering of the \ensuremath{\Delta} isobar, effective masses, and realistic momentum distributions are considered. It is found that the two-body isobar and real-pion production current account for most of the observed strength in the dip region. Our results do not support a large modification of the \ensuremath{\Delta}-isobar mass. We compare our model with the \ensuremath{\Delta}-hole model and in doing so confirm the microscopic picture of several of its phenomenological ingredients. Finally, the use of more realistic momentum distributions, obtained from relativistic mean field single-particle wave functions gives rise to results that are not much different from those obtained in the Fermi-gas model and compare fairly well with the data.
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