Integral measurement results in standard fields

Measured spectrum-averaged fission cross sections are reported for several benchmark fast-neutron fields. For the /sup 252/Cf spectrum, absolute cross section measurements at NBS and the University of Michigan are compared. Cross section ratios (relative to /sup 239/Pu) are reported for /sup 235/U, /sup 238/U, and /sup 237/Np for the following fields: /sup 235/U fission spectrum, BIG-10, CFRMF, SIGMA SIGMA, and the Intermediate-Energy Standard Neutron Field (ISNF) at NBS. Fission product yields measured by the Interlaboratory LMFBR Reaction Rate Program (ILRR) are reported in two categories: Consensus Yields from thorough interlaboratory studies and Subsidiary Yields for isotopes studied less intensively (usually by a single laboratory). All measured yields were determined by Ge(Li) counting of fission activation foils, with specific fission rates determined by counting fissions from a separate light deposit in an ionization chamber. The fission product yields for the CFRMF and BIG-10 fields are reported first separately and then combined, to provide a single set of yields for a Fast Reactor Spectrum. 11 tables.