The differential cross sections for elastic scattering of 2.5-Mev neutrons by Al, Fe, Zr, Sn, Ta, and Bi were measured over the angular range from 15° to 160°. At 7.0 Mev similar measurements were made for Be, C, Al, Fe, Zr, Sn, Ta, and Bi at angles ranging from 12° to 150°. Inelastic collision cross sections were determined by sphere transmission measurements for a number of elements at 1.0-, 1.77-, 2.5-, 3.25-, and 7-Mev neutron energies.

By using an optical model of the nucleus, cross sections for elastic scattering and for compound nucleus formation were calculated. With suitable choices of the optical model parameters the calculated cross sections are in reasonable agreement with the experimental values.

• Received 1 August 1956

DOI:https://doi.org/10.1103/PhysRev.104.1319