QUASI-ELASTIC DELTA-EXCITATION IN THE CHARGE RESPONSE OF THE NUCLEUS

We have studied the general relation between nuclear and free-nucleon longitudinal and transverse responses and shown that nuclear Fermi mot ion implies admixtures from transverse nucleon currents in the longitu dinal (or Coulomb) nuclear response and vice versa. We give the genera l expression for the relation between the nucleon and nuclear response s in the Fermi-gas model including the case of isobar excitation. In t he particular case of the DELTA-resonance we have shown that at large transferred momenta (i.e. great-than-or-equal-to 1 GeV/ c) an importan t tail is produced beyond the nucleon quasi-elastic peak which has not hing to do with Coulomb strength.