Neutron diffusion parameter measurements have been made at 21°C in 20, 50, and 80 percent concentrations of heavy and light water, including pure H20 and D2 0 as moderators. Pulsed neutron techniques were used with a 250-kv Cockcroft-Walton accelerator as the pulsed source. The range of bucklings used was from 0.05 cm⁻² to 0.70 cm⁻².
The values for the diffusion coefficient, Dₒ; the diffusion cooling coefficient, C; and the transport mean free path, A<sub>tr</sub>, were determined from the expansion of the decay constant to second order using iteration procedure. The values of Dₒ, C, and A<sub>tr</sub> are tabulated below for the various concentrations, including pure H₂O and D₂O.
<table style="width:100%">
<tr>
<th>Percent D₂0</th>
<th>Dₒ x 10⁻⁴ (cm²sec⁻¹)</th>
<th>C x 10⁻⁵ (cm⁴sec⁻¹)</th>
<th>λ<sub>tr</sub> (cm)</th>
</tr>
<tr>
<td>0</td>
<td>3.634±0.048</td>
<td>0.161±0.008</td>
<td>0.443</td>
</tr>
<tr>
<td>20</td>
<td>3.779±0.017</td>
<td>0.170±0.032</td>
<td>0.515</td>
</tr>
<tr>
<td>50</td>
<td>6.964±0.044</td>
<td>0.74±0.12</td>
<td>0.915</td>
</tr>
<tr>
<td>80</td>
<td>11.75±0.68</td>
<td>2.19±0.42</td>
<td>1.602</td>
</tr>
<tr>
<td>100</td>
<td>19.66±1.37</td>
<td>3.56±1.08</td>
<td>2.670</td>
</tr>
</table> / Doctor of Philosophy
| Identifer | oai:union.ndltd.org:VTETD/oai:vtechworks.lib.vt.edu:10919/88662 |
| Date | January 1965 |
| Creators | Jones, Harold |
| Contributors | Physics |
| Publisher | Virginia Polytechnic Institute |
| Source Sets | Virginia Tech Theses and Dissertation |
| Language | en_US |
| Detected Language | English |
| Type | Dissertation, Text |
| Format | 56 leaves, application/pdf, application/pdf |
| Rights | In Copyright, http://rightsstatements.org/vocab/InC/1.0/ |
| Relation | OCLC# 20212047 |
Page generated in 0.0021 seconds