Losses and depolarization of ultracold neutrons on neutron guide and storage materials
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Bondar, V.
Paul Scherrer Institute (PSI), Villigen PSI, Switzerland - Kyiv Polytechnic Institute (KPI), Kyiv, Ukraine
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Chesnevskaya, S.
Physik Department, Technische Universität München (TUM), Garching, Germany
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Daum, M.
Paul Scherrer Institute (PSI), Villigen PSI, Switzerland
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Franke, B.
Paul Scherrer Institute (PSI), Villigen PSI, Switzerland - IPP, Institut für Teilchenphysik, ETH Zürich, Switzerland
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Geltenbort, P.
Institut Laue-Langevin (ILL), Grenoble, France
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Göltl, L.
Paul Scherrer Institute (PSI), Villigen PSI, Switzerland
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Gutsmiedl, E.
Physik Department, Technische Universität München (TUM), Garching, Germany
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Karch, J.
Institut für Physik, Johannes Gutenberg University, Mainz, Germany
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Kasprzak, Malgorzata
Physics Department, University of Fribourg, Switzerland
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Kessler, G.
Physik Department, Technische Universität München (TUM), Garching, Germany
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Kirch, K.
Paul Scherrer Institute (PSI), Villigen PSI, Switzerland - IPP, Institut für Teilchenphysik, ETH Zürich, Switzerland
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Koch, Hans-Christian
Institut für Physik, Johannes Gutenberg University, Mainz, Germany
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Kraft, Andreas
Institut für Physik, Johannes Gutenberg University, Mainz, Germany
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Lauer, Thorsten
Institut für Physik, Johannes Gutenberg University, Mainz, Germany
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Lauss, B.
Paul Scherrer Institute (PSI), Villigen PSI, Switzerland
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Pierre, E.
Paul Scherrer Institute (PSI), Villigen PSI, Switzerland - Laboratoire de Physique Corpusculaire (LPC), Caen, France
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Pignol, G.
Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, France
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Reggiani, D.
Paul Scherrer Institute (PSI), Villigen PSI, Switzerland
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Schmidt-Wellenburg, P.
Paul Scherrer Institute (PSI), Villigen PSI, Switzerland
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Sobolev, Yuri
Institut für Physik, Johannes Gutenberg University, Mainz, Germany
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Zechlau, T.
Institut für Physik, Johannes Gutenberg University, Mainz, Germany
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Zsigmond, G.
Paul Scherrer Institute (PSI), Villigen PSI, Switzerland
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Published in:
- Physical Review C. - 2017, vol. 96, no. 3, p. 035205
English
At Institut Laue-Langevin (ILL) and Paul Scherrer Institute (PSI), we have measured the losses and depolarization probabilities of ultracold neutrons on various materials: (i) nickel-molybdenum alloys with weight percentages of 82/18, 85/15, 88/12, 91/9, and 94/6 and natural nickel Ni100, (ii) nickel-vanadium NiV93/7, (iii) copper, and (iv) deuterated polystyrene (dPS). For the different samples, storage-time constants up to ∼460s were obtained at room temperature. The corresponding loss parameters for ultracold neutrons, η, varied between 1.0×10−4 and 2.2×10−4. All η values are in agreement with theory except for dPS, where anomalous losses at room temperature were established with four standard deviations. The depolarization probabilities per wall collision β measured with unprecedented sensitivity varied between 0.7×10−6 and 9.0×10−6. Our depolarization result for copper differs from other experiments by 4.4 and 15.8 standard deviations. The β values of the paramagnetic NiMo alloys over molybdenum content show an increase of β with increasing Mo content. This is in disagreement with expectations from literature. Finally, ferromagnetic behavior of NiMo alloys at room temperature was found for molybdenum contents of 6.5 at.% or less and paramagnetic behavior for more than 8.7 at.%. This may contribute to solving an ambiguity in literature.
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Faculty
- Faculté des sciences et de médecine
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Department
- Département de Physique
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Language
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Classification
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Physics
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License
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License undefined
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Identifiers
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Persistent URL
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https://folia.unifr.ch/unifr/documents/305992
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