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Experimental study of quasi-elastic scattering of ultracold neutrons |
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| Authors: | A Steyerl BG Yerozolimsky AP Serebrov P Geltenbort N Achiwa YuN Pokotilovski O Kwon MS Lasakov IA Krasnoshchokova AV Vasilyev |
| Institution: | (1) Department of Physics, University of Rhode Island, Kingston, RI 02881, USA, US;(2) Department of Physics, Harvard University, Cambridge, MA 02138, USA, US;(3) Department of Neutron Research, Petersburg Nuclear Physics Institute, 188350 Gatchina, Russia, RU;(4) Institut Laue-Langevin, 38042 Grenoble, France, FR;(5) Department of Physics, Graduate School of Science, Kyushu University, Fukuoka 812-8581, Japan, JP;(6) Laboratory of Neutron Physics, Joint Institut for Nuclear Research, 141980 Dubna, Russia, RU |
| Abstract: | Ultracold neutrons (UCN) are lost from traps if they are quasi-elastically scattered from the wall with an energy gain sufficient to exceed the Fermi potential for the wall. Possible mechanisms of a quasi-elastic energy transfer are, for instance, scattering from hydrogen diffusing in an impurity surface layer or on surface waves at a liquid wall. Using two different experimental methods at the UCN source of the Institut Laue-Langevin we have investigated both the energy-gain and the energy-loss side of quasi-elastic UCN scattering on Fomblin grease coated walls. For Fomblin oil and similar new types of oil we report up-scattering data as a function of temperature and energy transfer. These low-temperature oils may be used in an improved measurement of the neutron lifetime, which requires extremely low wall reflection losses. Received 13 March 2002 Published online 31 July 2002 |
| Keywords: | PACS 61 12 -q Neutron diffraction and scattering – 61 12 Ex Neutron scattering techniques (including small-angle scattering) – 66 10 Cb Diffusion and thermal diffusion |
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