Method for analysis of transmission functions and neutron cross sections of heavy nuclides in the unresolved resonance region

A method for estimating mean neutron resonance parameters by analysis of both average neutron cross sections and neutron transmission data is given. It allows one to refine essentially the accuracy of parameter estimates. The method is based on the Monte Carlo simulation of the neutron resonance cross sections using multilevel Reich-Moore formulae. A novelty of calculational algoritOm is not only a stochastical generation of the interfering resonance ladder, but a stochastical Doppler broadening as well. Simultaneously the sensitivity coefficients of functionals in relation to the mean resonance parameters are calculated. For this purpose a method of parameter perturbation for the same statistical resonance sample is used. The Monte Carlo simulation has resulted in the total cross section probability distribution and the correlation functions of partial cross sections which are to be used for calculating cross section functionals by means of numerical integration