The Scattering of Fast Neutrons by Wolfram

Employing good geometry, homogeneous fast neutrons of energy 4.3 Mev, supplied by the d-d reaction in the Bartol Van de Graaff statitron, have been scattered in wolfram. Using binocular microscopes and Eastman NTA plates, twenty-four thousand fields of view were examined to obtain 2700 acceptable recoil proton tracks. The distribution in energy of the inelastically scattered neutrons is obtained. It is roughly estimated that the inelastic scattering cross section at 4.3 Mev is less than three-fourths as great as the elastic one.