Double Differential Continuum Neutron Scattering Cross Sections in Iron and Nickel for Incident Energies of 7.5, 10 and 12 Mev.

Double differential neutron inelastic scattering cross sections exciting high-lying levels in iron and nickel have been measured for incident neutron energies of 7.5, 10, and 12 MeV. Outgoing neutron energy distributions have been measured for neutron energies above 0.5 MeV up to about 2 MeV below the incident neutron energy. Scattered neutron angular distributions have been measured at up to 5 scattering angles between 45(DEGREES) and 145(DEGREES). These measurement have been made using time-of-flight techniques at Triangle Universities Nuclear Laboratory on the neutron scattering facility that has been developed at TUNL. Experimental attempts to isolate the effects of the reactions under study include careful design of the experimental geometry and measurement of the effects not associated with the desired processes insofar as they can be isolated. Further attempts to isolate the effects of the scattering cross section are made computationally by a large Monte Carlo type simulation of the experiment. The computed corrections include finite geometry, attenuation, non-monoenergetic source, multiple scattering, and other effects which cannot be effectively removed experimentally.