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Report No.

Evaluation of covariance for JENDL-4.0, 1; Pb isotopes

Iwamoto, Osamu

Covariance data have been evaluated for nuclear data of Pb isotopes in JENDL-4.0. The evaluation has been done for the cross sections such as total, inelastic-scattering, and (n,2n) reactions for the Pb isotopes of $$^{204}$$Pb, $$^{206}$$Pb, $$^{207}$$Pb and $$^{208}$$Pb in continuum energy region using CCONE-KALMAN code system. Model parameter covariance were deduced from uncertainties of cross sections estimated from experimental data using sensitivities of the parameters for optical model, level density and $$gamma$$-ray strength functions, etc. Cross correlations between reactions were also deduced from the unique parameter covariance for each isotope. Covariance of Legendre coefficients for elastic scattering angular distribution was evaluated. The evaluation methods and results are presented.



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