Scattering of Slow Neutrons. II

Abstract

The scattering of slow neutrons from various materials has been measured with several different detectors. The scattering cross section for a number of elements has been determined and the results given in a table. With suitable filters, the scattering curves for-several of the Fermi groups have been investigated. The differences between the groups show up most markedly when the scatterer is itself a good absorber of one of the groups. The effect of temperature on the activation of In has been investigated, and the temperature ratio $J_{90}=\frac{\mathrm{activity}\mathrm{at}\mathrm{liquid}\mathrm{air}\mathrm{temperature}}{\mathrm{activity}\mathrm{at}\mathrm{room}\mathrm{temperature}}$ found to be 1.08 for the $D$ neutrons and 1.21 for the $C$ neutrons.