Ground-state magnetization density of 89Y.

Elastic electron scattering cross sections have been measured for [sup 89]Y at 180[degree] for 0.72[lt][ital q][lt]2.67 fm[sup [minus]1]. The [ital M]1 form factor has been extracted and a Fourier-Bessel analysis performed to obtain the ground-state magnetization density. Calculations including effects of core polarization have been performed within the framework of the finite Fermi system theory. These show a weakening of the strong repulsion in the spin-isospin channel and are in overall agreement with the data.