Elastic Scattering of 84-Mev Neutrons

Measurements have been made of the angular distribution of 84-Mev neutrons scattered into angles between 2½° and 25° by Al, Cu, and Pb nuclei. Small spheres of these elements were placed in the neutron beam of the 184-in. cyclotron and the scattered neutrons with energies greater than 20 Mev were detected with pieces of carbon activated by the ${\mathrm{C}}^{12}\mathrm{}(n,2n)\mathrm{}{\mathrm{C}}^{11}$ reaction. Total scattering cross sections were obtained by integration of the differential scattering cross sections and also by attenuation measurements with good and poor geometry.