196Pt(n,xn yp γ) reactions using spallation neutrons from En=1 to 250 MeV

Neutron-induced reactions on Pt-196 were studied over the neutron energy range from 1 to 250 MeV. A "white" neutron beam was provided by the spallation neutron source of the Weapons Neutron Research facility at the Los Alamos Neutron Science Center. The prompt reaction gamma rays were measured with the large-scale Compton-suppressed Ge spectrometer GEANIE. The incident neutron energy was determined by the time-of-flight technique. Excitation functions for gamma -ray transitions in Pt-184,Pt-186,Pt-188,Pt-190-196 and Ir-189,Ir-191,Ir-193 isotopes are compared with enhanced Hauser-Feshbach reaction modeling, as implemented in the reaction code GNASH. Overall, the model predictions agree well with the measured gamma -ray yields. Discrepancies appear, however, due to inadequate discrete-level information in the calculations describing the preequilibrium process.