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Production of ultracold neutrons from cryogenic ²H₂, O₂, and C²H₄ converters

Atchison, F. ; Blau, B. ; Bodek, K. ; Brandt, B. van den ; Bryś, T. ; Daum, M. ; Fierlinger, P. ; Geltenbort, P. ; Hautle, P. ; Henneck, R. ; Heule, S. ; Holley, A. ; Kasprzak, Malgorzata ; Kirch, K. ; Knecht, A. ; Konter, J. A. ; Kuźniak, M. ; Liu, C.-Y. ; Pichlmaier, A. ; Plonka, C. ; Pokotilovski, Y. ; Saunders, A. ; Tortorella, D. ; Wohlmuther, M. ; Young, A. R. ; Zejma, J. ; Zsigmond, G.

In: EPL - Europhysics Letters, 2011, vol. 95, no. 1, p. 12001

Ultracold neutrons (UCN) have been produced using the cold neutron (CN) beam FUNSPIN at SINQ on cryogenic oxygen (O₂), tetradeuteromethane (C²H₄), and deuterium (²H₂) targets. The target cell (40 mm long, fiducial volume about 45 cm³) was operated between room temperature and 8 K and UCN were produced from gaseous, liquid and solid targets. UCN rates have been measured as a convolution...