Unconventional trapping of ultracold neutrons |
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| Institution: | 1. Department of Physics, University of Rhode Island, U.S.A., Kingston, RI 02881, USA;2. Institut Laue-Langevin, F-38042 Grenoble, France;3. Research Reactor Institute, Kyoto University, Kumatori, Osaka 590-0494, Japan;1. The European Synchrotron- ESRF, 71 Avenue des Martyrs, CS 40220, 38043 Grenoble Cedex 9, France;2. Univ. Grenoble Alpes, CEA, IRIG/MEM/NRS 38000 Grenoble, France;1. Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh, 11671, Saudi Arabia;2. Department of Civil Engineering, COMSATS University Islamabad, Abbottabad Campus, 22060, Pakistan;3. Department of Mechanics and Engineering Science, Peking University, Beijing, 100871, People’s Republic of China;4. Department of Mathematics and Statistics, Riphah International University I-14, Islamabad, 44000, Pakistan;5. Department of Physics, Riphah International University I-14, Islamabad, 44000, Pakistan;6. Mechanical Engineering Department, College of Engineering, Prince Sattam Bin Abdulaziz University, Wadi Addawaser, 11991, Saudi Arabia;7. Production Engineering and Mechanical Design Department, Faculty of Engineering, Mansoura University, P.O. 35516, Mansoura, Egypt;1. Surfaces and Particle Engineering Laboratory (SPEL), Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom;2. Engineering Formulation Europe, Syngenta Crop Protection Münchwilen AG, Breitenloh 5, CH-4333 Münchwilen, Switzerland;3. Department of Chemical and Biomolecular Engineering, University of Illinois, Urbana, IL 61801, United States;4. Key Laboratory of Organic Optoelectronics & Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, PR China;1. Key Laboratory for Space Bioscience & Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, PR China;2. The First Clinical Medical School, the First Affiliated Hospital of Jinan University Guangzhou Overseas Chinese Hospital, Guangzhou 510000, Guangdong, PR China;1. State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People''s Republic of China;2. Zhejiang Institute of Tianjin University, Shaoxing, Zhejiang 312300, People''s Republic of China;3. Zhejiang Engineering Research Center of Fat-soluble Vitamin, Shaoxing University, Shaoxing, Zhejiang 312000, People''s Republic of China;4. Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices, East China University of Technology, Nanchang 330013, China |
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| Abstract: | In unconventional storage experiments we filled ultracold neutrons (UCN) into a Fomblin-grease coated trap and then immediately removed the UCN from the storage volume by an absorber, until their residual density in the trap was measured to be negligible. When subsequently the absorber was withdrawn a significant number of UCN of higher energies emerged from the trap. Their appearance cannot be attributed to heating or cooling of residual UCN. Further experiments were performed to investigate the origin of these UCN which we call `late UCN'. We noticed that application of a magnetic field gradient at the trap wall as well as a replacement of Fomblin grease on the surface by Fomblin oil gave rise to small but measurable alterations of storage behavior. These phenomena are consistent with the hypothesis of temporary adhesion of a few UCN to a rough wall. |
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