Accumulation and extraction of ultracold neutrons from a superfluid helium converter coated with fluorinated grease

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dc.creatorZimmer, O.
dc.creatorSchmidt-Wellenburg, P.
dc.creatorAssmann, M.
dc.creatorFertl, M.
dc.creatorKlenke, J.
dc.creatorMironov, S.
dc.creatorWirth, H. -F.
dc.creatorBrandt, B. van den
dc.date2008-01-31
dc.date.accessioned2026-07-07T08:57:28Z
dc.date.available2026-07-07T08:57:28Z
dc.descriptionWe report experiments on the production of ultracold neutrons (UCN) in a converter of superfluid helium coated with fluorinated grease. We employed our technique of window-free extraction of accumulated UCN from the helium, in which they were produced by downscattering neutrons of a cold beam from the Munich research reactor. The time constant for UCN passage through the same extraction aperture as in a previous experiment was a factor two shorter, despite a lower mean velocity of the accumulated UCN in the present experiments. A time-of-flight measurement of the cold neutron spectrum incident on the converter allowed us to estimate the multi-phonon contribution to the UCN production. The UCN production rate inferred from two methods agrees with the theoretical expectation.
dc.description11 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/0801.4839
dc.identifierhttp://arxiv.org/abs/0801.4839
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/146981
dc.subjectNuclear Experiment
dc.titleAccumulation and extraction of ultracold neutrons from a superfluid helium converter coated with fluorinated grease
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