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The cross section for electron scattering by heavy nuclei is model-independent at energies below 60 Mev. The angular distributions of electrons scattered by tungsten at 31, 40, and 60 Mev are self-consistent and give a uniform-model radius equal to (1.18±0.10)A1/3×10^-13 cm.
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Pidd et al. (1955) studied this question.
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