Neutron production and thermal moderation at the PSI UCN source
  We report on gold foil activation measurements performed along a vertical channel along the tank of the ultracold neutron source at the Paul Scherrer Institute. The activities obtained at various distances from the spallation target are in very good agreement with MCNPX simulations which take into account the detailed description of the source as built. 
H.Becker, G.Bison, B.Blau, Z.Chowdhuri, J.Eikenberg, M.Fertl, K.Kirch,   B.Lauss, G.Perret, D.Reggiani, D.Ries, P.Schmidt-We...
nucl-ex physics.ins-det