Proton core polarization in low-lying states ofSr86

Electron-scattering cross sections, measured between 0.4 and 3.1 ${\mathrm{fm}}^{\mathrm{-}1}$, have been unfolded to obtain charge transition densities for the low-lying $2^{+}$, $4^{+}$, $6^{+}$, and $8^{+}$ states in ${}_{}{}^{86}{}_{}{}^{}\mathrm{Sr}$. A comparison is made to analogous levels in ${}_{}{}^{92}{}_{}{}^{}\mathrm{Mo}$. Angular momentum recoupling in the 1${\mathit{g}}_{9/2}$ shell of two protons in ${}_{}{}^{92}{}_{}{}^{}\mathrm{Mo}$ and two neutron holes in ${}_{}{}^{86}{}_{}{}^{}\mathrm{Sr}$ are the dominant configurations for these levels. Proton core polarization in ${}_{}{}^{86}{}_{}{}^{}\mathrm{Sr}$ neutron valence transitions diminishes with increasing multipolarity, indicating the residual interaction weakens with increasing momentum transfer.