![]() ![]() P ( θ ) depends on the ratio R of length to radius of the neutron guide. Although it is difficult to measure the transverse velocity components v y and v z, part of the angular distribution P ( θ ) of the beam are available (see, e.g. 4) will be used as initial distribution function. The resulting normalized distribution of the forward velocity in x -direction ( Fig. The opening function of the chopper was deconvoluted and with the help of the distance-of-flight, the corresponding velocity spectrum was extracted. The time-of-flight spectrum was corrected for the chopper offset. time-of-flight spectrum of the ultracold neutron beam at the Institute Laue-Langevin was measured with this method in 2008. ![]()
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