Abstract
Measurements of relative differential cross sections have been obtained for elastic scattering of $^{3}\mathrm{He}$ nuclei from $^{208}\mathrm{Pb}$ at energies well below the Coulomb barrier. The measurements show deviations from Rutherford scattering, which are attributed to electric polarization of the $^{3}\mathrm{He}$ nuclei in the Coulomb field of $^{208}\mathrm{Pb}$. The deduced value of the electric polarizability for $^{3}\mathrm{He}$ is \ensuremath{\alpha}=0.250\ifmmode\pm\else\textpm\fi{}0.040 ${\mathrm{fm}}^{3}$. This result is significantly larger than expected from measurements of cross sections for $^{3}\mathrm{He}$ photodisintegration.
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