Pulsed Neutron Experiment in D2O Water and Ice.
NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD
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The first extensive pulsed neutron experiment in heavy water spanning the phase change from 40C to -50C in ice is described. Values for the diffusion coefficient D sub 0 and the cooling coefficient C were calculated from measurements obtained over a range of buckling from .03 to .05 per square cm. Correlation with past measurements in water was very good. Support was obtained for sparse earlier indications of low values for the diffusion parameters below 50C and approaching the ice phase. These values are lower than would be predicted by straight line extrapolation from measurements at higher temperatures. There was insufficient evidence from which to conclude that a real discontinuity in D sub o exists at the phase change. It is considerably more likely that a discontinuity does exist in C, related to the high coherent scattering and crystalline type behavior of heavy water. Author
- Fission Reactor Physics