Progress of Covariance Evaluation at the China Nuclear Data Center

Journal Article · Thu Jan 15 00:00:00 EST 2015 · Nuclear Data Sheets

DOI:https://doi.org/10.1016/J.NDS.2014.12.004· OSTI ID:22436752

Zhang, Q. ^[1]; Zhang, Y.; Liu, T.; Ge, Z.; Lu, H.; Sun, Z.; Yu, B. ^[1]; Tang, G. ^[2]

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1. China Nuclear Data Center, P.O. Box, 275(41), Beijing 102413 (China)
2. Peking University, Beijing 100871 (China)

Covariance evaluations at the China Nuclear Data Center focus on the cross sections of structural materials and actinides in the fast neutron energy range. In addition to the well-known Least-squares approach, a method based on the analysis of the sources of experimental uncertainties is especially introduced to generate a covariance matrix for a particular reaction for which multiple measurements are available. The scheme of the covariance evaluation flow is presented, and an example of n+{sup 90}Zr is given to illuminate the whole procedure. It is proven that the accuracy of measurements can be properly incorporated into the covariance and the long-standing small uncertainty problem can be avoided.

• OSTI ID: 22436752
• Journal Information: Nuclear Data Sheets, Vol. 123; Conference: International workshop on nuclear data covariances, Santa Fe, NM (United States), 28 Apr - 1 May 2014; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0090-3752
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDES
CHINA
EVALUATION
FAST NEUTRONS
INTEGRAL CROSS SECTIONS
LEAST SQUARE FIT
ZIRCONIUM 90