Uncertainty Analyses of Neutron Cross Sections for Nitrogen-15, Lead-206,207,208, Bismuth-209, Plutonium-238, Americium-242m, and Curium-244 in JENDL-3.3

Abstract

Covariances of neutron cross sections for ¹⁵N, ^206,207,208Pb, ²⁰⁹Bi, ²³⁸Pu, ²⁴²m Am and ²⁴⁴Cm contained in JENDL-3.3 have been evaluated for the design of accelerator-driven transmutation systems. The covariances were obtained from the experimental data and model calculations on which the JENDL-3.3 data were based. The physical quantities for which covariances were deduced are the elastic scattering cross section of ¹⁵N, the inelastic scattering cross sections of ^206,207,208Pb and 209Bi, and the fission and capture cross sections of ²³⁸Pu, ^242m Am and 244Cm. Uncertainties in the resolved resonance parameters were estimated for ²³⁸Pu, ²⁴²m Am and ²⁴⁴Cm. The results were compiled in the ENDF-6 format and merged with the JENDL-3.3 data.

KEYWORDS:

• JENDL-3.3
• covariance
• cross section
• resonance parameter
• Nitrogen-15
• Lead-206,207,208
• Bismuth-209
• Plutonium-238
• Americium-242m
• Curium-244