The angular distributions of photo-neutrons from lead, copper, aluminum and beryllium have been measured by using bremsstrahlung of maximum energy of 17 Mev from a betatron. The neutron detector is ZnS-paraffin-Lucite light guide button. The results are 1+(1.29±0.53)sin 2 θ, 1+(1.6±0.8)sin 2 θ, 1+(0.17±0.06)sin 2 θ, 1+(0.30±0.11)sin 2 θ for beryllium, aluminum, copper, and lead.
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Asada et al. (1958) studied this question.
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