Abstract
Ultra-Cold Neutrons have energies ≃ 10−7 eV, velocities ≃ 5m/sec and wavelength ≃ 500 Å. They rise only about 1 meter in the Earth’s gravitational field and can be totally reflected by magnetic fields ≃ 40 kilogauss and material surfaces. A collection of atoms appears as a group of hard sphere repulsive potentials to a neutron. The UCN, with wavelengths » interatomic spacing are affected by the space average of these potentials which is about 10−7 eV for many materials. On total reflection the UCN wavefunction penetrates into the reflecting surface and can be absorbed or upscattered by the thermally vibrating nucleii located there.
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Supported by: Bundesministerium für Forschung und Technologie (W.-Germany) and Society for the Promotion of Accelerator Physics (Japan)
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A.I. Kilvington + R. Golub — Physics Letters, to be published
R. Golub, C. Jewell, P. Ageron, W. Mampe, B. Heckel and A.I. Kilvington — Z. Phys. B 51, 187 (1983)
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© 1989 Springer-Verlag Berlin, Heidelberg
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Golub, R. (1989). Upscattering of Ultra-Cold Neutrons (UCN) by Excitations in Superfluid 4He. In: Ohbayashi, K., Watabe, M. (eds) Elementary Excitations in Quantum Fluids. Springer Series in Solid-State Sciences, vol 79. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-83428-8_7
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DOI: https://doi.org/10.1007/978-3-642-83428-8_7
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-83430-1
Online ISBN: 978-3-642-83428-8
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