https://doi.org/10.1051/epjconf/202023913003
Nuclear data adjustment using Bayesian inference, diagnostics for model fit and influence of model parameters
1 CEA, DEN, Cadarache, F-13108 Saint Paul les Durance, FRANCE
2 Department of Physics and Astronomy, Uppsala University, Sweden
* Corresponding author: e-mail: cyrille.de-saint-jean@cea.fr
Published online: 30 September 2020
The mathematical models used for nuclear data evaluations contain a large number of theoretical parameters that are usually uncertain. These parameters can be calibrated (or improved) by the information collected from integral/differential experiments. The Bayesian inference technique is used to utilize measurements for data assimilation. The Bayesian approximation is based on the least-square or Monte-Carlo approaches. In this process, the model parameters are optimized. In the adjustment process, it is essential to include the analysis related to the influence of model parameters on the adjusted data. In this work, some statistical indicators such as the concept of Cook’s distance; Akaike, Bayesian and deviance information criteria; effective degrees of freedom are developed within the CONRAD platform. Further, these indicators are applied to a test case of 155Gd to evaluate and compare the influence of resonance parameters.
© The Authors, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
