Accession Number : AD0756623

Title :   Pulsed Neutron Experiment in D2O Water and Ice.

Descriptive Note : Doctoral thesis,

Corporate Author : NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD

Personal Author(s) : Boroson,Harold R.

Report Date : FEB 1973

Pagination or Media Count : 309

Abstract : 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)

Descriptors :   (*NEUTRON TRANSPORT THEORY, HEAVY WATER), (*THERMAL NEUTRONS, DIFFUSION), (*HEAVY WATER, THERMAL NEUTRONS), ICE, PHASE STUDIES, BUCKLING(NEUTRON DENSITY), RADIATION CHEMISTRY, TEMPERATURE, CURVE FITTING, GRAPHICS, COMPUTER PROGRAMS, THESES, PULSES

Subject Categories : Fission Reactor Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE