Boson Densities in the Germanium Isotopes and Inelastic Electron Scattering

The collective properties of ${}_{}{}^{70,72,74,76}{}_{}{}^{}\mathrm{Ge}$ have been explored through the measurement of the transition charge densities of the first two $2^{+}$ states up to a momentum transfer of 3.0 ${\mathrm{fm}}^{-1\mathrm{}}$. Their spatial structure and their apparently anomalous behavior are readily explained in the framework of the interacting boson model.