Status of the R-matrix Code AMUR toward a consistent cross-section evaluation and covariance analysis for the light nuclei

Japan Atomic Energy Agency, Shirakata-shirane 2-4, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan

^a e-mail: kunieda.satoshi@jaea.go.jp

Published online: 13 September 2017

Abstract

We report the status of the R-matrix code AMUR toward consistent cross-section evaluation and covariance analysis for the light-mass nuclei. The applicable limit of the code is extended by including computational capability for the charged-particle elastic scattering cross-sections and the neutron capture cross-sections as example results are shown in the main texts. A simultaneous analysis is performed on the ¹⁷O compound system including the ¹⁶O(n,tot) and ¹³C(α,n)¹⁶O reactions together with the ¹⁶O(n,n) and ¹³C(α,α) scattering cross-sections. It is found that a large theoretical background is required for each reaction process to obtain a simultaneous fit with all the experimental cross-sections we analyzed. Also, the hard-sphere radii should be assumed to be different from the channel radii. Although these are technical approaches, we could learn roles and sources of the theoretical background in the standard R-matrix.