Neutron-induced reactions on ${}^{196}\mathrm{Pt}$ 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 ${}^{184,186,188,190-196}\mathrm{Pt}$ and ${}^{189,191,193}\mathrm{Ir}$ 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.

• Received 4 May 2001

DOI:https://doi.org/10.1103/PhysRevC.64.054614