Abstract
Transmission spectra were measured with the time-of-flight technique at the Dubna pulsed reactor for samples of metallic U, UO 2, U 3O 8, and UO 3 enriched in 235U, and were compared in the regions of nine low-energy resonances to observe chemically induced shifts. After elimination of contributions caused by different Doppler broadenings, the shifts are interpreted as changes of the mean-square charge radius for nuclei capturing neutrons. The 〈 r 2〉 of the compound-nucleus states show on average a weak diminution as compared with the ground-state value.
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