Deep inelastic separated response functions from Ca-40 and Ca-48

Deep inelastic scattering cross sections have been measured for /sup 40/Ca and /sup 48/Ca at electron energies between 100 and 375 MeV at scattering angles of 90/sup 0/ and 140/sup 0/. Longitudinal and transverse response functions at three-momentum transfers between 250 and 410 MeV/c have been extracted using a Rosenbluth separation. The response functions are compared to calculations modeling the nucleus as a noninteracting relativistic Fermi gas. The model is found to agree with the observed transverse response function in the region of expected quasi-free nucleon knockout, but the model overestimates the observed longitudinal response. Comparisons of the response functions of the two isotopes are made, and differences between /sup 40/Ca and /sup 48/Ca are seen.