Covariance analysis of n + 7Li data for ENDF/B-VI

A new covariance analysis of n + 7Li experimental data has been completed for Version VI of ENDF/B. The analysis basically updates our 1981 work for ENDF/B-V.2 to include new data that has become available since that time and to incorporate cross correlations between different experiments. The bulk of the new measured data consists of some 10 new (or newly revised) tritium-production measurements involving about 70 new data points. The new analysis results in only small changes in the previous evaluation of the tritium-production cross section but significantly reduces the magnitudes of uncertainties due to the more extensive and accurate data base that was used. (author)