ANGULAR ANISOTROPY OF FRAGMENTS FROM FISSION OF U-236 BY NEUTRONS WITH ENERGY 0.375-7.22 MEV

The multiangle track-detector technique (fission fragments were detect ed by means of cylindrical glass detectors) has been used to carry out detailed measurements of the angular distributions of fission fragmen ts of U-236 and the energy dependence of the ratio of the cross sectio ns for fission of U-236 and U-235 by neutrons with energy 0.375-7.22 M eV. The statistical law W(theta) = 1 + a cos2-theta is inadequate for description of the angular distributions of the fission fragments in t he studied energy region, and it is necessary to include higher powers of the cosine. In the entire range of neutron energies substantial ir regularities of the angular anisotropy are observed.