Revision of JEF-2 evaluations for the long-lived fission products 129I and 99Tc

This paper describes revisions of the neutron radiative capture cross-sections of 129I and 99Tc for JEF-2.2. For 129I the main revision was the modification of resonance parameters at negative energy to fit the most recent experimental values of thermal cross-section and resonance integral, measured by Friedmann et al. This leads to a large increase in the thermal cross-section from 27b to 33.9b and a slight increase in the resonance integral from 28.8b to 30.6b. The revision of 99Tc consists of adopting the first two resonances from the work of Fischer, leading to a value of the resonance integral of about 300b, which is lower than the recommended value of the Brookhaven compilation. (author). 23 refs.; 2 figs.; 4 tabs