Response functions for deep inelastic scattering fromCa40

Deep inelastic electron scattering cross sections have been measured from ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ at energies between 100 and 375 MeV and at scattering angles of 90° and 140°. Longitudinal and transverse response functions at three-vector momentum transfers of 330, 370, and 410 MeV/c were extracted from these data using a Rosenbluth separation. The integrated longitudinal response functions for the three momentum transfers are found to have, respectively, 65%, 75%, and 90% of the longitudinal strength predicted by the Fermi gas model.