Journal article

Losses and depolarization of ultracold neutrons on neutron guide and storage materials

  • Bondar, V. Paul Scherrer Institute (PSI), Villigen PSI, Switzerland - Kyiv Polytechnic Institute (KPI), Kyiv, Ukraine
  • Chesnevskaya, S. Physik Department, Technische Universität München (TUM), Garching, Germany
  • Daum, M. Paul Scherrer Institute (PSI), Villigen PSI, Switzerland
  • Franke, B. Paul Scherrer Institute (PSI), Villigen PSI, Switzerland - IPP, Institut für Teilchenphysik, ETH Zürich, Switzerland
  • Geltenbort, P. Institut Laue-Langevin (ILL), Grenoble, France
  • Göltl, L. Paul Scherrer Institute (PSI), Villigen PSI, Switzerland
  • Gutsmiedl, E. Physik Department, Technische Universität München (TUM), Garching, Germany
  • Karch, J. Institut für Physik, Johannes Gutenberg University, Mainz, Germany
  • Kasprzak, Malgorzata Physics Department, University of Fribourg, Switzerland
  • Kessler, G. Physik Department, Technische Universität München (TUM), Garching, Germany
  • Kirch, K. Paul Scherrer Institute (PSI), Villigen PSI, Switzerland - IPP, Institut für Teilchenphysik, ETH Zürich, Switzerland
  • Koch, Hans-Christian Institut für Physik, Johannes Gutenberg University, Mainz, Germany
  • Kraft, Andreas Institut für Physik, Johannes Gutenberg University, Mainz, Germany
  • Lauer, Thorsten Institut für Physik, Johannes Gutenberg University, Mainz, Germany
  • Lauss, B. Paul Scherrer Institute (PSI), Villigen PSI, Switzerland
  • Pierre, E. Paul Scherrer Institute (PSI), Villigen PSI, Switzerland - Laboratoire de Physique Corpusculaire (LPC), Caen, France
  • Pignol, G. Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, France
  • Reggiani, D. Paul Scherrer Institute (PSI), Villigen PSI, Switzerland
  • Schmidt-Wellenburg, P. Paul Scherrer Institute (PSI), Villigen PSI, Switzerland
  • Sobolev, Yuri Institut für Physik, Johannes Gutenberg University, Mainz, Germany
  • Zechlau, T. Institut für Physik, Johannes Gutenberg University, Mainz, Germany
  • Zsigmond, G. Paul Scherrer Institute (PSI), Villigen PSI, Switzerland
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    19.09.2017
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.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/305992
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