Status and accuracy of neutron data for the important isotopes relevant to the thorium-uranium fuel cycle in the fast energy region

The present status of data on the measured or predicted neutron cross sections in the fast energy range 50 keV-20 MeV for the isotopes relevant to thorium-uranium fuel cycle has been reviewed. Emphasis is on the energy dependent cross sections. Angular distributions and some less important cross sections are not included. The review aims not at the evaluation but the presentation of the status in form of the target accuracies and the extent to which they are met. The review also indicates existing discrepancies. After giving a summary of data requests for 231Th, 232Th, 233Th, 231Pa, 232Pa, 233Pa, 232U and 234U, each of these isotopes is treated individually. A brief discussion of the data is followed by a table containing information about data sources, techniques and standards used and errors reported. Whereever considerable data are available, a graph is used to show the various data sets. (M.G.B.)