Elastic Scattering of 14-Mev Neutrons from Beryllium and Carbon

The angular distributions of elastically scattered 14-Mev (nominal energy) neutrons have been measured for beryllium and carbon from 20^∘{} to 140^∘{}. Ring geometry, time-of-flight techniques, and relatively low detector biases were used. A comparison with optical-model calculations by Bjorklund and Fernbach indicates that the parameters that fit the medium and heavy elements do not yield satisfactory fits for beryllium and carbon.