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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

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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)

Submitter: 鬼柳 善明

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