Cross Sections for Forward-Angle Elastic Scattering of 7 to 10 MeV Neutrons from Carbon, Nitrogen, and Oxygen
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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Absolute differential cross sections for the elastic scattering of 7. 40, 7.55, 8.00, 8.55, 9.00, and 9.50 MeV neutrons from carbon, nitrogen, and oxygen in the angular range from 2.5 degrees to 15 degrees have been determined. Measurements were made relative to the scattering from lead by use of a special-purpose collimator. The cross section scale was then established by absolute measurements for lead in a ring geometry experiment. The results for nitrogen are consistent with recent measurements at other laboratories which suggest that the discrepancy in previous nitrogen cross section data around 7-8 MeV neutron energy arose from an underestimate of the elastic scattering cross section. The data presented in this report represent the first direct measurements of neutron scattering cross sections for light elements at very small scattering angles.
- Nuclear Physics and Elementary Particle Physics