Neutron production and thermal moderation at the PSI UCN source
H.Becker, G.Bison, B.Blau, Z.Chowdhuri, J.Eikenberg, M.Fertl, K.Kirch,, B.Lauss, G.Perret, D.Reggiani, D.Ries, P.Schmidt-Wellenburg, V.Talanov,, M.Wohlmuther, G.Zsigmond
TL;DR
This study measures neutron production and moderation at the PSI UCN source using gold foil activation, confirming simulation accuracy and providing insights into neutron behavior in the source.
Contribution
The paper presents experimental validation of neutron production and moderation in the PSI UCN source through gold foil activation measurements and detailed MCNPX simulations.
Findings
Activation measurements agree with simulations
Neutron flux distribution characterized along the channel
Validation of source modeling accuracy
Abstract
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.
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