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Abstract
We measured precisely, using the Small Angle Neutron Scattering (SANS) technique, the radius of the carbon nuclei shell of the C60 molecule, in spite of its small value. For this purpose, controlled undersaturated solutions of C60 in CS2, where theC60 molecules are individually distributed, were studied in the room temperature range. Absolute measurements also allowed us to extract from the contrast in scattering length the partial molecular volume of the molecule C60 in solution in CS2.