Neutron velocity distribution from a superthermal solid 2H2 ultracold neutron source

Altarev, I. ; Daum, M. ; Frei, A. ; Gutsmiedl, E. ; Hampel, G. ; Hartmann, F. ; Heil, W. ; Knecht, A. ; Kratz, J. ; Lauer, T. ; Meier, M. ; Paul, S. ; Schmidt, U. ; Sobolev, Y. ; Wiehl, N. ; Zsigmond, G.

In: The European Physical Journal A, 2008, vol. 37, no. 1, p. 9-14

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    Summary
    We have determined for the first time the velocity distribution of neutrons from a solid 2H2 ultracold neutron (UCN) source. The spectrum rises sharply above 4.5m/s and has a maximum around 7m/s after transport in an 8m long guide. The number of neutrons in the UCN velocity range (< 7m/s) may be increased by a factor of two by placing the experiment 1m above the UCN source level