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タイトル	en 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
作成者	en Ooi, M. en Ino, T. en Muhrer, G. en Pitcher, E.J. en Russell, G.J. en Ferguson, P.D. en Iverson, E.B. en Freeman, D. en Kiyanagi, Y. NRID 1000080002202
アクセス権	open access
主題	Other en Pulsed neutron source Other en Hydrogen moderator Other en Ortho–para conversion Other en Energy spectrum Other en Emission time distribution NDC 429.6
内容注記	Abstract en 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.
出版者	en Elsevier B.V.
日付	Issued2006-10-15
言語	eng
資源タイプ	journal article
出版タイプ	AM
資源識別子	HDL http://hdl.handle.net/2115/15820
関連	URI http://www.sciencedirect.com/science/journal/01689002 isVersionOf DOI https://doi.org/10.1016/j.nima.2006.06.073
収録誌情報	PISSN 0168-9002 en Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 巻566 号2 開始ページ699 終了ページ705
ファイル	fulltext N&MPR566-2.pdf 728.07 KB (application/pdf) Issued2006-10-15
コンテンツ更新日時	2023-07-26