Modelling Neutron Transmission Experiments and Demonstration of Resonance Shielding Effects by Using Evaluated Nuclear Data Files
A calculation model for neutron transmission and self-indication experiments with samples composed from one or more isotopes is presented. On the basis of this model a computer program — FEDMIX , — has been developed. The data for calculation can be taken from any well known evaluated nuclear data file as ENDF/B, JENDL, BROND etc. Some typical calculated neutron transmission spectra and their dependence on experimental conditions are demonstrated.
The FEDMIX can also be applied to the exact calculation of lumped mutual screening of two resonance elements. The results of such calculations are compared with those of Bondarenko’s f-factor method and it is found that the later one is inadequate in energy intervals where both isotopes have large resonances. It is also shown that the lumped cross-sections often cannot be calculated from measured transmissions and self-indications.
KeywordsResonance Parameter Large Resonance Resonance Element Neutron Transmission Nuclear Data File
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