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Description
The single differential scattering cross section of zirconium hydride has been measured at 296 °K and 700°K to complement room temperature measurements previously made. These measurements were needed to compare with theoretical predictions from the Broadened Einstein Level and Acoustical Mode model at a temperature more consistent with reactor operating temperatures. The main problem in taking measurements at the elevated temperatures has been to prevent contamination and hydrogen loss in the sample. A specially constructed sample holder and oven was used. A neutron transmission measurement was made before and after heating to determine the change in sample composition. The measurements were performed at 700°K over an angular range of 20° to 155°, and at 296° K from 80° to 155°. A pulsed source of neutrons was produced using an electron linear accelerator. The energy of the neutrons used ranged from 0. 008 eV to 1.0 eV and was measured using the time-of-flight method. Several correction methods were used in the analysis of the data including a correction for multiple scattering in the sample. The results show that the multiple scattering correction method is valid at this sample thickness. The correction methods are discussed. The experimental results, when compared to the prediction of the theoretical model, compare very well at both temperatures. The results show that the single differential cross section of zirconium hydride is temperature dependent. It can be concluded that the Broadened Einstein Level and Acoustical Mode model best describes the thermalization of neutrons in zirconium hydride for a wide range of temperatures.
