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Transmission of ultra-cold neutrons through guides coated with materials of high optical potential

We have measured the transmission of ultra-cold neutrons (UCN) through tubes coated on the inside with materials of high optical potentials. The best transmission value, T, normalised to 1m long UCN guides was obtained with a beryllium coated quartz guide, T=(99.0±1.0)%. Furthermore, excellent trans...

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Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2014-03, Vol.741, p.71-77
Main Authors: Daum, M., Franke, B., Geltenbort, P., Gutsmiedl, E., Ivanov, S., Karch, J., Kasprzak, M., Kirch, K., Kraft, A., Lauer, T., Lauss, B., Müller, A.R., Paul, S., Schmidt-Wellenburg, P., Zechlau, T., Zsigmond, G.
Format: Article
Language:English
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Summary:We have measured the transmission of ultra-cold neutrons (UCN) through tubes coated on the inside with materials of high optical potentials. The best transmission value, T, normalised to 1m long UCN guides was obtained with a beryllium coated quartz guide, T=(99.0±1.0)%. Furthermore, excellent transmission coefficients were found for (i) a glass tube coated with NiMo(88/12), T=(97.3 ±0.6)%, (ii) a NiMo(85/15) guide made by the replication technique, T=(97.1 ±0.8)% and (iii) a glass guide coated with NiMo(82/18), T=(96.3 ±2.1)%. The results demonstrate that UCN guides made from coated glass tubes have the same excellent transmission properties as those produced with the replication technique. They are, however, significantly cheaper.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2013.12.050