The angular distributions of elastically and inelastically scattered 2·9 mev neutrons

The angular distributions resulting from the elastic and inelastic scattering of 2·9 MeV neutrons by iron, copper, lead and bismuth have been measured with a hydrogen-filled chamber, using `ring' geometry. Total elastic and inelastic cross-sections and the transport cross-section are given. The observations for iron and copper show that angular distributions for elastic scattering are not necessarily similar for elements of nearly the same A, but can differ markedly. The results are compared with calculations based on the optical model.