Partial(gamma)-Ray Cross Sections for the reaction (239)Pu(n,2n(gamma)i) and the (239)Pu(,2n) Cross Section.

摘要

Absolute partial gamma-ray cross sections for production of discrete gamma rays in the (239)Pu(n,2n(gamma)i)238Pu reaction have been measured. The experiments were performed at LANSCE/WNR on the 60R flight line. Reaction gamma-rays were measured using the large-scale Compton-suppressed aray of Ge detectors, GEANIE. The motivation for this experiment, an overview of the partial gamma-ray cross-section measurement, and an introduction to the main experimental issues will be presented. The energy resolution of the Ge detectors allowed identification of reaction gamma rays above the background ofam sample radioactivity and fission gamma rays. The use of planar Ge detectors with their reduced sensitivity to neutron interactions and improved line shape was also important to the success of this experiment.