International Conference on Nuclear Data for Science and Technology 2007
DOI: 10.1051/ndata:07635

The Global Assessment of Nuclear Data, GANDR

D.W. Muir¹, A. Trkov², I. Kodeli³, R. Capote⁴ and V. Zerkin<sup>4

1</sup>  International Atomic Energy Agency (Consultant), P.O. Box 452, Kittery, Maine, USA
²  Jozef Stefan Institute, Ljubljana, Slovenia
³  International Atomic Energy Agency representative at the OECD/NEA Data Bank, 92130 Issy-les-Moulineaux, France
⁴  International Atomic Energy Agency, Nuclear Data Section, 1400 Vienna, Austria

Published online: 21 May 2008

Abstract
The GANDR project was initiated by the IAEA in 2001 with several ambitious goals, including the eventual provision of assistance to data experts in the planning of new measurements. We describe a hardware and software system developed in support of this project, now in operation in the IAEA Nuclear Data Section. A specific design goal of the system is to be able to track, in complete detail, the impact of new experiments on the uncertainties and correlations of 91000 independent parameters. This number is sufficient, for example, to describe the broad, energy-dependent features of most cross section types for 130 different target materials. Applications of GANDR to date have utilized experimental data from the EXFOR database. EXFOR includes only the diagonal elements of the data covariance matrix (variances), and often the supplied variances describe only the statistical part of the data uncertainty, so the GANDR system offer several options for modifying and supplementing the available experimental uncertainties.

© CEA 2008