A parallel plate ionization chamber, in which one electrode served as a collimator, was employed to study the angular distribution of fission fragments referred to the neutron beam axis. Fragments from neutron bombardment of the following nuclei were examined: Th²³², U²³³, U²³⁵, U²³⁸, and Np²³⁷. When 14-Mev neutrons were used, a preponderance of fission along the neutron axis as compared with the orthogonal direction was noted. The average value obtained for the 0^∘90^∘ ratios was 1.26. Thermal neutron fission was found to be isotropic.
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Brolley et al. (1954) studied this question.
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