Alpha-particles are emitted in coincidence (i.e., within 5×{}10^-6 sec.) with fission by U²³⁵ and Pu²³⁹. The maximum range observed corresponds to an energy of 16 Mev. About one alpha per 250 fissions is emitted by U1²³⁵ and one alpha per 500 fissions by Pu²³⁹. The investigation is being continued.
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Farwell et al. (1947) studied this question.
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