Open Access
| Issue |
ND 2007
2007
|
|
|---|---|---|
| Article Number | 072 | |
| Number of page(s) | 4 | |
| Section | Evaluation of covariance matrices | |
| DOI | https://doi.org/10.1051/ndata:07280 | |
| Published online | 17 June 2008 | |
International Conference on Nuclear Data for Science and Technology 2007
DOI: 10.1051/ndata:07280
1 National Nuclear Data Center, Brookhaven National Laboratory, USA
2 T-16, Los Alamos National Laboratory, USA
Published online: 21 May 2008
© CEA 2008
DOI: 10.1051/ndata:07280
Neutron cross section covariances from thermal energy to 20 MeV
D. Rochman1, M. Herman1, P. Oblozinský1, S.F. Mughabghab1, M. Pigni1 and T. Kawano21 National Nuclear Data Center, Brookhaven National Laboratory, USA
2 T-16, Los Alamos National Laboratory, USA
Published online: 21 May 2008
Abstract
We describe new method for energy-energy covariance calculation from the thermal energy up to 20 MeV. It is based on three powerful basic components: (i) Atlas of Neutron Resonances in the resonance region; (ii) the nuclear reaction model code EMPIRE in the unresolved resonance and fast neutron regions, and (iii) the Bayesian code KALMAN for correlations and error propagation. Examples for cross section uncertainties and correlations on 90Zr and 193Ir illustrate this approach in the resonance and fast neutron regions.
© CEA 2008