Analysis of Nuclear Data using the R-Matrix Code SAMMY

An overview is presented of the analysis code SAMMY, used for evaluation and analysis of time-of-flight cross section data in the resolved and unresolved resonance regions. Included are brief descriptions of the methods used for generating the theoretical cross sections (R-Matrix theory), for simulating the effect of experimental conditions (such as Dopplerand resolution-broadening, multiplescattering corrections), and for fitting to the model parameters (Bayes’ equations). Emphasis is placed on recent developments such as the inclusion of direct capture contributions to the cross section, the use of an implicit data covariance technique for including all experimental uncertainties, and the development of methodologies for propagating other uncertainties inherent in the correction processes.