Coulomb Distortion Effects in Large-AngleM1Electroexcitation

A reanalysis of inelastic electron-scattering measurements from giant $M1\mathrm{}$ states in ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ and ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ and in ${}_{}{}^{26}{}_{}{}^{}\mathrm{Mg}$ is made using Coulomb-distortion corrections in place of the plane-wave Born-approximation analysis. It is shown that the corrections even for light nuclei can reduce the nuclear form factors for $M1\mathrm{}$ transitions outside the experimental error quoted in the plane-wave Born approximation analysis of electron scattering. This reduction in $B(M1, q)$ is magnified at the photon point.