The angular anisotropy of neutron-induced fission has been studied with a double fission chamber. For U²³⁵ at 7.4 Mev and Np²³⁷ at 14.3 Mev, the variation of the differential fission cross section was found to depend strongly on the fourth power of the cosine of the angle between the fission fragment and the neutron beam. For U²³⁵ a resonance-type dependence of the anisotropy on neutron energy has been observed. Qualitative indication that the light and heavy fission fragment groups have slightly different anisotropies has been obtained in the case of Np²³⁷ at 14.3 Mev.
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Brolley et al. (1955) studied this question.
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