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Measurements of the change of neutronic performance of a hydrogen moderator at Manuel Lujan Neutron Scattering Center due to conversion from ortho- to para-hydrogen state
| Title: | Measurements of the change of neutronic performance of a hydrogen moderator at Manuel Lujan Neutron Scattering Center due to conversion from ortho- to para-hydrogen state |
| Authors: | Ooi, M. Browse this author | | Ino, T. Browse this author | | Muhrer, G. Browse this author | | Pitcher, E.J. Browse this author | | Russell, G.J. Browse this author | | Ferguson, P.D. Browse this author | | Iverson, E.B. Browse this author | | Freeman, D. Browse this author | | Kiyanagi, Y. Browse this author →KAKEN DB |
| Keywords: | Pulsed neutron source | | Hydrogen moderator | | Ortho–para conversion | | Energy spectrum | | Emission time distribution |
| Issue Date: | 15-Oct-2006 |
| Publisher: | Elsevier B.V. |
| Journal Title: | Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment |
| Volume: | 566 |
| Issue: | 2 |
| Start Page: | 699 |
| End Page: | 705 |
| Publisher DOI: | 10.1016/j.nima.2006.06.073 |
| Abstract: | The ortho/para-hydrogen ratio is a key parameter for the neutronic performance of a liquid hydrogen moderator. In order to get a better understanding of the influence that the ortho/para-hydrogen ratio has on the performance of such a moderator, we measured the neutronic performance of the partially coupled liquid-hydrogen moderator at the LANSCE Manuel Lujan Jr. Neutron Scattering Center, Los Alamos, USA, as a function of time after condensation. This was done by measuring the energy spectra and pulse shapes (neutron emission time distributions) of this moderator. It was found that the neutronic characteristic of the moderator changes with the elapsed time after condensation, and that the changes were so significant that for any scattering experiment made on such a moderator, the effect should be carefully evaluated. |
| Relation: | http://www.sciencedirect.com/science/journal/01689002 |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/15820 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 鬼柳 善明
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