Quasi-elastic electron scattering from /sup 238/U

Rosenbluth separations of electron scattering response functions for uranium targets were made with data using measurements from five laboratory angles (60/sup 0/, 90/sup 0/, 134.5/sup 0/, 140/sup 0/, and 160/sup 0/) at three-momentum transfers ranging from 280 to 500 MeV/c. The separations were made to determine if previously reported quenching of the longitudinal response function persisted in targets with large atomic number. The results are compared to relativistic Fermi gas calculations and calculations following the formalism of Rosenfelder. The measured transverse response functions agree quite well with the Rosenfelder-type calculations and almost as well with the relativistic Fermi gas calculations. The measured longitudinal response functions show significant quenching at low q. This quenching diminishes with increasing q but is never quite overcome.