The average number of neutrons ν emitted in the spontaneous fission of 242 Cm has been measured by a method depending on the device of counting only those neutrons which are detected after the occurrence of a fission. In this way the effect of neutrons from sources other than spontaneous fission is eliminated. The value found for ν is 3.0 neutrons per fission. The estimated standard error is 10-15%.
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Barclay et al. (1953) studied this question.
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