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VOLUME 58 (1993) | ISSUE 10 | PAGE 844
The angular distribution of ultracold neutrons produces by scattering cold neutrons in superfluid 4He
We calculate the angular distribution of ultracold neutrons (UCN) produced by the inelastic scattering of cold (8.9 A) neutrons in superfluid 4He and show that it is isotropic at zero UCN energy, while at the limiting velocity of UCN (8m/s), there is a 6% asymmetry in the forwardvs. backward-directed UCN production rate. Although this is a relatively weak effect, it should be included in accurate Monte Carlo simulations of proposed and existing superfluid 4He UCN sources.