A coupled-channel computer program has been used to calculate dispersion corrections to elastic and inelastic electron scattering from ${}_{}{}^{152}{}_{}{}^{}\mathrm{Sm}$ and ${}_{}{}^{166}{}_{}{}^{}\mathrm{Er}$ arising from the virtual excitation of some intermediate states in the ground state rotational band. Data from recent experiments on these nuclei have been analyzed using both phenomenological and Fourier-Bessel forms for the transition charge densities. The inclusion of dispersion corrections in the analysis was found to affect the extracted nuclear transition charge densities at a level comparable to other sources of uncertainty. These dispersion corrections did not remove the discrepancies existing between these experiments and the predictions of microscopic theories.

NUCLEAR REACTIONS ${}_{}{}^{152}{}_{}{}^{}\mathrm{Sm}(e, e^{\prime })$, and ${}_{}{}^{166}{}_{}{}^{}\mathrm{Er}(e, e^{\prime })$ calculations, coupled-channels, $35 \mathrm{MeV}<E<\mathrm{}350\mathrm{} \mathrm{MeV}$. Dispersive effects on elastic and inelastic cross sections and on extracted nuclear shapes.

• Received 21 February 1978

DOI:https://doi.org/10.1103/PhysRevC.18.1388