THE EFFECT OF TEMPERATURE ON DIFFUSION PARAMETERS OF HEAVY WATER
Measurements of the diffusion parameters of heavy water were made using a 1-Mev Van de Graaff accelerator utilizing the Be/sup 9/(d,n) reaction under pulsed operation. The measurements were made at temperatures of 10, 20, 31, 40, and 50 deg C. For each temperature, six different sets of measurements of the decay constant were made by varying the height of the heavy water in the cylinder. The smallest buckling value corresponding to the initial maximum height of D/sub 2/O in the water was about 0.083 cm/sup -2/. The highest value of buckling used in each set of experiments was about 0.100 cm/sup -2/. The test cylinder was isolated from extraneous neutrons by a shield consisting of an inner shell of Cd surrounded by 1 inch of borax. This reduced the room background to a negligible amount. To avoid moderator contamination by atmospheric moisture, a closed liquid transfer system was employed between the moderator container and an external reservoir. The system was filled with argon. A BF/sub 3/ counter was located under the moderator container and was connected to a 25-channel time analiyzer having a channel width of 9.57 microseconds. The mean-life, lambda , for each buckling was computed using Peierls's method. Values of constants D/sub 0/ and (c-d) for each set were computed by the method of least squares, using the relation, lambda = lambda /sub a/ + D/sub 0/B/sup 2/ (C-d)B/sup 4/. Assuming ll/sub a/ approximately 0, and correcting for the 0.12 percent light water impurity, the values obtained are listed. Since the extrapolation distance is related to D/sub 0/, the Remington Rand Univac 1105 was used to obtain self- consistent values of bucklings through an iterative process, which was in turn used in the least square calculation. The value of D/sub 0/ agrees, within the limits of experimental error, with that found by Raievski and Horowitz in 1954, who used the modulated source method. The nature of (c-d) at 20 deg C compares favorably with that found by Sjostrand in 1959, who reported 3.5 plus or minus 0.8 x 10/sup 5//cm/sup 4//sec as its value. (Dissertation Abstr., 23- No. 3, 1962)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-17-002219
- OSTI ID:
- 4767853
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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Related Subjects
BACKGROUND
BERYLLIUM 9
BORATES
BORAX
BUCKLING
CADMIUM
COMPUTERS
CONTAMINATION
CYLINDERS
DECAY
DEUTERON BEAMS
DIFFUSION
ERRORS
HEAVY WATER
IMPURITIES
LEAST SQUARES
LIFETIME
LIQUIDS
MATHEMATICS
MEASURED VALUES
MODERATORS
MODULATION
NEUTRON SOURCES
NEUTRONS
NUCLEAR REACTIONS
NUMERICALS
PHYSICS
PULSE ANALYZERS
PULSES
SCINTILLATION COUNTERS
SHIELDING
SODIUM COMPOUNDS
TEMPERATURE
VAN DE GRAAFF ACCELERATORS
VESSELS