{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/88662"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/88662","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"The measurement of neutron diffusion parameters in heavy and light water concentrations by the pulsed neutron technique","abstract":"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, Atr, were determined from the expansion of the decay constant to second order using iteration procedure. The values of Dₒ, C, and Atr are tabulated below for the various concentrations, including pure H₂O and D₂O. | Percent D₂0 | Dₒ x 10⁻⁴ (cm²sec⁻¹) | C x 10⁻⁵ (cm⁴sec⁻¹) | λtr (cm) |
| 0 | 3.634±0.048 | 0.161±0.008 | 0.443 |
| 20 | 3.779±0.017 | 0.170±0.032 | 0.515 |
| 50 | 6.964±0.044 | 0.74±0.12 | 0.915 |
| 80 | 11.75±0.68 | 2.19±0.42 | 1.602 |
| 100 | 19.66±1.37 | 3.56±1.08 | 2.670 |
","abstract_html":"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>","abstract_has_math":false,"creators":["Jones, Harold"],"institution":"Virginia Polytechnic Institute","degree_name":"Doctor of Philosophy","degree_level":"doctoral","degree_discipline":null,"degree_department":"Physics","school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1965,"date_issued":"1965","date_published":"1965","updated_at":"2026-07-22T22:18:53Z","subjects":[],"languages":["en_US"],"rights":["In Copyright"],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10919/88662","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.department","label":"Department","values":["Physics"]},{"key":"dc:creator","label":"Author","values":["Jones, Harold"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2019-03-26T19:53:13Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2019-03-26T19:53:13Z"]},{"key":"dc:date.issued","label":"Date","values":["1965"]},{"key":"dc:publisher","label":"Institution","values":["Virginia Polytechnic Institute"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation"]},{"key":"dc:type.dcmitype","label":"Dc Type Dcmitype","values":["Text"]},{"key":"thesis:degree_level","label":"Degree Level","values":["doctoral"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Doctor of Philosophy"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Virginia Polytechnic Institute"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_US"]},{"key":"dc:rights","label":"Dc Rights","values":["In Copyright"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10919/88662"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["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, Atr, were determined from the expansion of the decay constant to second order using iteration procedure. The values of Dₒ, C, and Atr are tabulated below for the various concentrations, including pure H₂O and D₂O. | Percent D₂0 | Dₒ x 10⁻⁴ (cm²sec⁻¹) | C x 10⁻⁵ (cm⁴sec⁻¹) | λtr (cm) |
| 0 | 3.634±0.048 | 0.161±0.008 | 0.443 |
| 20 | 3.779±0.017 | 0.170±0.032 | 0.515 |
| 50 | 6.964±0.044 | 0.74±0.12 | 0.915 |
| 80 | 11.75±0.68 | 2.19±0.42 | 1.602 |
| 100 | 19.66±1.37 | 3.56±1.08 | 2.670 |
"]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Doctor of Philosophy"]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["The measurement of neutron diffusion parameters in heavy and light water concentrations by the pulsed neutron technique"]}]}],"canonical_facts":{"dc:contributor.department":["Physics"],"dc:creator":["Jones, Harold"],"dc:date.accessioned":["2019-03-26T19:53:13Z"],"dc:date.available":["2019-03-26T19:53:13Z"],"dc:date.issued":["1965"],"dc:description.abstract":["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, Atr, were determined from the expansion of the decay constant to second order using iteration procedure. The values of Dₒ, C, and Atr are tabulated below for the various concentrations, including pure H₂O and D₂O. | Percent D₂0 | Dₒ x 10⁻⁴ (cm²sec⁻¹) | C x 10⁻⁵ (cm⁴sec⁻¹) | λtr (cm) |
| 0 | 3.634±0.048 | 0.161±0.008 | 0.443 |
| 20 | 3.779±0.017 | 0.170±0.032 | 0.515 |
| 50 | 6.964±0.044 | 0.74±0.12 | 0.915 |
| 80 | 11.75±0.68 | 2.19±0.42 | 1.602 |
| 100 | 19.66±1.37 | 3.56±1.08 | 2.670 |
"],"dc:description.degree":["Doctor of Philosophy"],"dc:format.mimetype":["application/pdf"],"dc:identifier.uri":["http://hdl.handle.net/10919/88662"],"dc:language.iso":["en_US"],"dc:publisher":["Virginia Polytechnic Institute"],"dc:rights":["In Copyright"],"dc:rights.uri":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:title":["The measurement of neutron diffusion parameters in heavy and light water concentrations by the pulsed neutron technique"],"dc:type":["Dissertation"],"dc:type.dcmitype":["Text"],"thesis:degree_level":["doctoral"],"thesis:degree_name":["Doctor of Philosophy"],"thesis:institution_name":["Virginia Polytechnic Institute"]},"updated_at":"2026-07-22T22:18:53Z"}