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A code, SIGMAL, to Doppler-broaden evaluated cross sections in the ENDL format was designed. This code can Doppler-broaden cross sections that result from neutrons, protons, deuterons, tritons, 3He, or alpha particles incident on any target nuclei. The code allows broadening to up to 100 final temperatures, either directly from the initial temperature or by bootstrapping to successively higher temperatures. 6 figures, 2 tables.
The program SIGMA 1 is designed to Doppler-broaden and/or thin tabulate pointwise cross sections in the ENDF/B BCD format. The broadening is performed from an initial (not necessarily O deg K) temperature to up to 100 final temperatures. Each section of File 3 is assumed to be a linear--linear table of poirtwise cross section vs energy. The program is written entirely in FORTRAN IV, and has been implemerted on the CDC 6600/ 7600 and IBM 360. The program requires the following units: input, output, the original data, the broadened data, and two scratch files. Core requirement on the CDC 7600 is 20 K, and the time required to Doppler-broaden /sup 238/U from 0% deg K to 293 deg K is 45 seconds of CDC 7600 time. Input and output for a sample problem are shown. (1 figure) (RWR).