CODE NUCLIDE ORIGINAL DATA TAKEN FROM MODIFICATION ADDITIONAL FILE MODIFICATIONS ORIGINAL DATA TAKEN FROM MODIFICATION ADDITIONAL FILE MODIFICATIONS COMMENTS
1082207 082_Pb_207 JENDL-3.3 Covariances - BNL, July, 2011: Covariances were adopted from
COMMARA-2.0, where BNL performed a new evaluation of covariances
for a set of four Pb isotopes in the full energy range in 2010.
The thermal and resolved resonance region made use of the
covariance formalism based on kernel approximation along with
data in the Atlas of Neutron Resonances. We note that the
resonance region for Pb isotopes extends to very high energies.
Elastic scattering uncertainty in the resonance region was
largely determined by potential scattering contribution via the
uncertainty of the scattering radius R'.
In the fast neutron region up to 20 MeV covariance estimates were
produced using the nuclear reaction code EMPIRE and the Bayesian
code KALMAN. The KALMAN code along with selected experimental
data was used to determine the correlation matrix of the model
parameters. Furthermore, additional parameters scaling total and
absorption cross sections were included to prevent the
unrealistic drop in the cross-section uncertainties and, in some
instances, to cover spread of the experimental data. For all
Pb isotopes, the elastic cross-section uncertainties were
computed as difference of total and absorption reaction channel.