Transmission of very slow neutrons through material foils
F. Atchison, B. Blau, A. Bollhalder, M. Daum, P. Fierlinger, P. Geltenbort, G. Hampel, M. Kasprzak, K. Kirch, S. K_s04chli, B. Kuczewski, H. Leber, M.
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Abstract
At the Paul Scherrer Institute (PSI), a very intense source of ultracold neutrons (UCN) is being built. The UCN converter of solid deuterium must be contained in a vessel. Produced UCN leave that vessel through its top lid. To decide on the design of the vessel and the top lid, we have measured the transmission of neutrons with velocities between 3 and 20m/s through different material foils. Contrary to expectations, we found that transmission through aluminium and aluminium alloys is equal or even higher compared to zirconium and reactor-grade zirconium alloys, respectively.
