Coincidences between the neutrons from neutron-induced fission of U²³⁵ were measured using fast neutron counters, working on the principle of proton recoil. From measurements at angles of 30^∘{}, 60^∘{}, 90^∘{}, 135^∘{}, and 180^∘{} between the directions of the fission neutrons, it was found that the number of coincidences is fairly constant from 30^∘{} to 90^∘{}, and increases by about a factor 2 from 90^∘{} to 180^∘{}. This result can be explained if it is assumed that the fission neutrons most probably come from opposite fragments.
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DeBenedetti et al. (1948) studied this question.
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