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1348 GORDON, LARSH, SIKKELAND, AND SEABORG result, it is inferred that fission results only from reactions in which a compound nucleus is formed from the carbon particle and the gold nucleus. This observation is in contrast to those in the uranium-plus-carbon system, in which, at higher bombarding energies (^90 Mev), there is incomplete momentum transfer in some of the reactions that lead to fission. 23 The slight increase in fragment kinetic-energy release with increasing bombarding energy is attributed to an increase in the average number of neutrons evaporated prior to fission. Thus, the fissioning nuclei

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