Nuclear modeling of (n, x, [gamma]) reactions and determination of partial cross sections

This talk would describe nuclear reaction modeling work in collaboration with experimental measurements at Los Alamos' GEANIE array. The GEANIE array is able to measure discrete gamma-rays in the deexcitation of residual nuclei produced following neutron-induced reactions, using time-of-flight with a white neutron spectrum. We have studied reactions on a range of target nuclides including actinides (eg 239Pu, 235,8U) as well as dosimetry materials (eg Y89, 193Ir). Since GEANIE is unable to measure all deexcitation gamma-rays, nuclear modeling and theory is needed to augment the measurements. This allows the gamma-ray data to be understood in terms of direct, preequilibrium, Hauser-Feshbach, fission, and capture mechanisms, and allows reaction channel cross sections to be inferred. The work also involves a study of the excitation of isomers, and reactions on nuclei away from stability, in nuclear reactions