Abstract
We report on our first recent measurements of the energy spectrum of upscattered Ultra-Cold-Neutrons in liquid He4 at temperatures around 1 Kelvin. The measurements were made on the Superthermal UCN Source at the ILL [1]. This source produces UCN’s in liquid He4 by down-scattering (phonon-emission) of 10 Å neutrons. The UCN’s produced in this way are stored in the He4 container, since they are totally reflected from the walls. The UCN’s can gain energy through scattering by Phonons [3] and Rotons [3], and hence leave the container. We have measured the spectrum of these upscattered neutrons by using a pseudo statistical chopper [4]. The first preliminary measurements show a discrepancy with the spectrum expected on the basis of phonon and roton scattering.
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© 1991 Plenum Press, New York
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Gutsmiedl, E., Golub, R., Butterworth, J. (1991). Spectroscopic Study of Scattering of UCN by Liquid He4 . In: Wyatt, A.F.G., Lauter, H.J. (eds) Excitations in Two-Dimensional and Three-Dimensional Quantum Fluids. NATO ASI Series, vol 257. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-5937-1_12
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DOI: https://doi.org/10.1007/978-1-4684-5937-1_12
Publisher Name: Springer, Boston, MA
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