Transverse Response Functions in Deep-Inelastic Electron Scattering forCa40,Ca48, andFe56

Deep-inelastic inclusive electron-scattering cross sections from ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$, ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$, and ${}_{}{}^{56}{}_{}{}^{}\mathrm{Fe}$ have been measured at 60°, 90°, and 140° and at energy transfers including the $\Delta (3, 3)$ region. The transverse response function in the momentum interval 300 MeV/c <|q| < 600 MeV/c was extracted by the Rosenbluth prescription. Different theoretical approaches to the quasielastic region are compared to the data. A mass-number scaling is observed.