Measured total cross sections of slow neutrons scattered by solid deuterium and implications for ultracold neutron sources

F. Atchison, B. Blau, B. Van Den Brandt, T. Brya, M. Daum, P. Fierlinger, P. Hautle, R. Henneck, S. Heule, K. Kirch, J. Kohlbrecher, G. Kühne, J. A. Konter, A. Pichlmaier, A. Wokaun, K. Bodek, M. Kasprzak, M. Kuniak, P. Geltenbort, J. Zmeskal

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Abstract

The total scattering cross sections for slow neutrons with energies in the range 100 neV to 3 meV for solid ortho-H22 at 18 and 5 K, frozen from the liquid, have been measured. The 18 K cross sections are found to be in excellent agreement with theoretical expectations and for ultracold neutrons dominated by thermal up scattering. At 5 K the total scattering cross sections are found to be dominated by the crystal defects originating in temperature induced stress but not deteriorated by temperature cycles between 5 and 10 K.

Original languageEnglish
Article number182502
JournalPhysical Review Letters
Volume95
Issue number18
DOIs
StatePublished - 28 Oct 2005
Externally publishedYes

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