The Angular Distribution of Protons Scattered by High Energy Neutrons

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Abstract
The scattering of 11-Mev neutrons by protons has been investigated. The neutrons from the disintegration of a beryllium target are collimated by a hole in a protective water wall. They are then scattered in a hydrogen gas cell and the recoil protons are observed at two different angles. The detection system consists of two parallel plate ionization chambers arranged so that protons may pass through both. Only coincidences are recorded thereby diminishing the very large neutron recoil background. The results indicate that the intensity of the protons varies as the cosine of the scattering angle in the laboratory system. Hence the scattering in the center of gravity system is isotropic within the experimental accuracy of ten percent.

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