Abstract
ROBERTS1 and others have reported the emission of delayed neutrons with a period of 12 sec. from uranium under neutron bombardment, but the effect seems to be a small one2, the main body of neutrons being produced in a much shorter period. Green and Alvarez have Shown that there is no delay exceeding 3 × 10–3 sec. in the actual production of fission, but it seemed possible that the neutrons might not be produced at the moment of fission but rather as the products of rapid disintegration of the primary fission particles.
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