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Covariance Matrix Evaluation and Processing in the Resolved/Unresolved Resonance Regions

This document serves as a summary of the work of Subgroup 20 (SG20) on covariance matrix evaluation and processing in the resolved/unresolved resonance regions, organised under the auspices of the Nuclear Energy Agency’s Nuclear Science Committee Working Party on International Evaluation Co-operation (WPEC). The work described in this report focuses on:

- summarising the issues related to covariance evaluation in the resonance region;

- discussing the retroactive method used in the SAMMY code [1];

- describing the compact format for storing huge covariance matrices in ENDF-6 files;

- recent developments and upgrades of processing codes to generate a multi-group covariance matrix from resonance parameter covariance data.

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