Neutron cross section covariances from thermal energy to 20 MeVD. Rochman1, M. Herman1, P. Oblozinský1, S.F. Mughabghab1, M. Pigni1 and T. Kawano2
1 National Nuclear Data Center, Brookhaven National Laboratory, USA
2 T-16, Los Alamos National Laboratory, USA
Published online: 21 May 2008
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