Magnetic Moments in Calcium Isotopes via a Surface-Interaction Experiment

A rotation of the angular correlation of deexcitation $\gamma$ rays from ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ and ${}_{}{}^{44}{}_{}{}^{}\mathrm{Ca}$ was observed in a tilted foil geometry. The signs and magnitudes of the magnetic moments of the $2_1^{+}$ level of ${}_{}{}^{44}{}_{}{}^{}\mathrm{Ca}$ and of the $3_1^{-}$ level of ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ were determined to be $g=-0.28\mathrm{}\pm 0.11$ and $g=+0.52\mathrm{}\pm 0.18$, respectively. The experiment demonstrates that polarization of deeply bound electronic configurations can be appreciable and that this technique can be used as a quantitative measure of magnetic moments of picosecond nuclear levels.