title: Measured total cross sections of slow neutrons scattered by solid deuterium and implications for ultracold neutron sources.
abstract: The total scattering cross sections for slow neutrons with energies in the range 100 neV to 3 meV for solid ortho-2H2 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.
authors.affiliation: Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
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authors.initials: F
authors.lastname: Atchison
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authors.lastname: Blau
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authors.lastname: van den Brandt
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authors.lastname: Bryś
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authors.lastname: Daum
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authors.lastname: Fierlinger
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authors.lastname: Hautle
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authors.lastname: Henneck
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authors.lastname: Kirch
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authors.lastname: Kohlbrecher
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authors.lastname: Kühne
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authors.lastname: Konter
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authors.lastname: Pichlmaier
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authors.lastname: Wokaun
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authors.lastname: Bodek
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authors.lastname: Kasprzak
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authors.lastname: Kuźniak
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authors.lastname: Geltenbort
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authors.lastname: Zmeskal