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

Ooi, M.; Ino, T.; Muhrer, G.; Pitcher, E.J.; Russell, G.J.; Ferguson, P.D.; Iverson, E.B.; Freeman, D.; Kiyanagi, Y.

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

Ooi, M.; Ino, T.; Muhrer, G. et al.

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment, 2006, 566(2), 699-705

Permalink : https://hdl.handle.net/2115/15820

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アクセス権	open access
URI	https://hdl.handle.net/2115/15820
タイトル	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
著者	Ooi, M. ; Ino, T. ; Muhrer, G. ; Pitcher, E.J. ; Russell, G.J. ; Ferguson, P.D. ; Iverson, E.B. ; Freeman, D. ; Kiyanagi, Y.
著者名 Ooi, M.
著者名 Ino, T.
著者名 Muhrer, G.
著者名 Pitcher, E.J.
著者名 Russell, G.J.
著者名 Ferguson, P.D.
著者名 Iverson, E.B.
著者名 Freeman, D.
e-Rad_Researcher 80002202 著者名 Kiyanagi, Y.
言語	英語
キーワード	Pulsed neutron source
	Hydrogen moderator
	Ortho–para conversion
	Energy spectrum
	Emission time distribution
発行日	2006-10-15
出版者	Elsevier B.V.
収録物名	Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment
巻(号)	566(2)
ページ	699-705
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
PISSN	0168-9002
関連情報	URI http://www.sciencedirect.com/science/journal/01689002
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.nima.2006.06.073