Ortho-para equilibrium in a liquid D2 neutron moderator under irradiation

F. Atchison, P. Beaud, T. Bryś, M. Daum, P. Fierlinger, R. Henneck, T. Hofmann, K. Kirch, G. Kühne, G. Knopp, A. Pichlmaier, A. Serebrov, H. Spitzer, J. Wambach, J. Wimmer, A. Wokaun, K. Bodek, P. Geltenbort, M. Giersch, J. ZmeskalK. Mishima

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The ortho-D2 concentration of gas samples taken from the liquid D2 cold moderator of the SINQ spallation neutron source at PSI has been measured. A value of co=0.762±0.001(statistical)±0.006(systematical) for the in situ quasiequilibrium at a temperature of 25 K and at an almost continuous power deposition of 230±50 mW/g is established for samples taken after long irradiation periods. This unexpectedly low value, (math equation) is explained by a simple radiation-induced breakup and recombination model for D2 molecules.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number9
StatePublished - 2003
Externally publishedYes


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