239Pu neutron resonance parameters revisited and covariance matrix in the neutron energy range from thermal to 2.5 keV

To obtain the resonance parameters in a single energy range up to 2.5 keV neutron energy and the corresponding covariance matrix, a reevaluation of (239)Pu was performed with the analysis code SAMMY. The most recent experimental data were analyzed in the energy range thermal to 2.5keV. The experimental data were renormalized, aligned on a common energy scale, and corrected for residual background. Average neutron transmission and cross sections calculated with the new resonance parameters were compared to the corresponding experimental data and to ENDF/B-VI.