Abstract
The optical isomer shift in the $^{8}S_{\frac{7}{2}}\ensuremath{\rightarrow}^{10}P_{\frac{7}{2}}$ atomic transition in neutral americium has been measured for the \ensuremath{\sim}1-ms spontaneously fissioning isomer, $^{240}\mathrm{Am}^{m}(\mathrm{S}\mathrm{F})$. With use of a laser-excited optical pumping technique, this transition is shifted by +2.6 \ifmmode\pm\else\textpm\fi{} 0.2 \AA{} to 6407.2\ifmmode\pm\else\textpm\fi{}0.2 \AA{} implying a difference in nuclear mean square radii, $\ensuremath{\delta}〈{r}^{2}〉$, of 5.1\ifmmode\pm\else\textpm\fi{}0.2 ${\mathrm{fm}}^{2}$ between the fission isomer and the normal ground state. These experiments provide the first direct experimental proof for the large deformations expected for fission isomers.
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