Inelastic electron scattering cross sections for ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}$ have been measured at a scattering angle of 180°, with incident beam energies ranging from 81.9 to 268.9 MeV. Transverse form factors were measured for transitions to low-lying natural-parity states, to unnatural-parity ‘‘stretched’’ $J^{\pi }$${=4\mathrm{}}^{\mathrm{-}}$ states, and to the $J^{\pi }$${=2\mathrm{}}^{\mathrm{-}}$ analog to the ${}_{}{}^{14}{}_{}{}^{}\mathrm{B}$ ground state. Cross sections for $4^{\mathrm{-}}$ states at 11.7 and 17.3 MeV are combined with pion scattering data to determine the isoscalar and isovector transition amplitudes. Form factors for other states are compared to shell-model calculations. From the excitation energy of the newly discovered $J^{\pi }$T${=2\mathrm{}}^{\mathrm{-}}$2 state at 22.1 MeV, the ${}_{}{}^{14}{}_{}{}^{}\mathrm{-}_{}^{14}{}_{}{}^{}$B Coulomb energy difference is determined to be 2.25±0.10 MeV.

• Received 13 April 1989

DOI:https://doi.org/10.1103/PhysRevC.40.1861