CAJ | 학술논문

对7Li, 11B和17O系统的R矩阵模型拟合进行了系统的协方差传递特性研究;揭示出部分协方差传递的规律性,发现系统误差的中程相关项在协方差传递中起到非常重要的作用.
대7Li, 11B화17O계통적R구진모형의합진행료계통적협방차전체특성연구;게시출부분협방차전체적규률성,발현계통오차적중정상관항재협방차전체중기도비상중요적작용.
This work is done for improving the current international standard cross section of nuclear reaction. The features of covariance propagation in R-matrix model fitting for 7Li, 11B and 16O systems are researched systematically with Code RAC, and the results about propagation of non-diagonal elements of covariance matrix are presented. It is found that in R-matrix model fitting, short-energy-range parameters result in relatively smaller covariance propagation coefficient (CPC), medium and long-energy-range parameters produce relatively larger CPC. Especially the medium-energy-range component of systematic error plays very important role in propagation of covariance. In the evaluation procedure of nuclear data both long-energy-range component (LERC) and medium-energy-range component (MERC) of systematic error should be considered in experimental data-base file. Furthermore, these conclusions are suitable for the similar model fitting in other science fields.