Extension of R-matrix code AMUR toward analysis on actinide nuclei; A Feasibility study on U

Kunieda, Satoshi  

The AMUR code was updated for analysis of neutron cross-sections on the heavier nuclei by introducing approximated R-matrix formulae defined in the ENDF-6 format. In this work, with the updated version of AMUR, let me demonstrate a feasibility analysis to experimental cross-sections on U which are stored in the EXFOR database. It was confirmed that the values of the resonance parameters were successfully obtained through the fitting procedure, together with their covariance data. In this presentation, I will focus on discussions on the resulting correlation matrices of cross-sections, where the present results certainly show traces of constraints from the R-matrix theory.