Abstract
A new time-of-flight technique for measuring neutron scattering cross sections, which is particularly valuable for fissile samples, has been developed. By means of a spatially uniform 4π neutron source, it is possible to place the neutron detector far from the scattering sample. With this geometry, the background associated with the neutron-induced capture and fission reactions can be completely separated from the scattered neutron signal. The reduction in background rate is adequate for performing scattering measurements on the common fissile nuclides. The large separation between the neutron detector and the scattering sample also permits measurements on very radioactive samples.
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