Evaluation of neutron nuclear data on ruthenium isotopes

Neutron nuclear data on ^{96,98,99,100,101,102,103,104,105,106}Ru have been evaluated for the next version of JENDL general-purpose file in the energy region from 10^{? 5} eV to 20 MeV. The thermal capture cross sections of ^96,102Ru were modified so as to reproduce the latest measured data. The statistical model was applied to calculate the cross sections above the resolved resonance region. In the calculations, coupled-channel optical-model parameters were used for neutrons. Preequilibrium and direct-reaction processes were taken into account in addition to the compound process. The present evaluation is consistent with available experimental data. The evaluated data are compiled into an ENDF-formatted data file.