R-MATRIX ANALYSIS OF 239PU NEUTRON TRANSMISSIONS AND FISSION CROSS-SECTIONS IN ENERGY-RANGE FROM 1.0 KEV TO 2.5 KEV

The results of the Pu-239 high resolution neutron transmission measurements of Harvey et al. and of the Pu-239 high resolution fission cross section measurements of Weston & Todd performed at the Oak Ridge Electron Linear Accelerator (ORELA) were analysed in the energy range from 1 keV to 2.5 keV by the Bayesian code SAMMY using the Reich-Moore approximation of the R-matrix theory. The results obtained in a previous analysis in the energy range from thermal to 1 keV were updated by taking into account the recent renormalization of the experimental fission data by Weston & Todd. The statistical properties of the parameters of the resonances identified in the energy range from thermal to 2.5 keV were examined and improved values of the average parameters were obtained. The resonance parameters are given in an ENDF-6 format file available from JAERI Nuclear Data Center and from NEA Data Bank (OECD).