Interpretation of subcritical measurements with polyethylene reflected plutonium sphere

Subcritical noise analysis measurements have been performed with an alpha phase plutonium sphere reflected by polyethylene. These measurements were performed at the Los Alamos Critical Experiment Facility in 2002 to provide an estimate of the subcriticality of the plutonium sphere reflected by polyethylene of varying thickness. This paper provides a description of the measurements and presents the analysis of the measurements. The measured and calculated spectral ratios differ are in good agreement with the ENDF/B-VI nuclear data sets and the 'interpreted' and calculated keff are in good agreement. (author)