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Chin. Phys., 2005, Vol. 14(3): 500-504    DOI: 10.1088/1009-1963/14/3/012

Neutronic studies of the coupled moderators for spallation neutron sources

Yin Wen, Liang Jiu-Qing
Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China
Abstract  We investigate the neutronic performance of coupled moderators to be implemented in spallation neutron sources by Monte-Carlo simulation and give the slow neutron spectra for the cold and thermal moderators. CH4 moderator can provide slow neutrons with highly desirable characteristics and will be used in low-power spallation neutron sources. The slow neutron intensity extracted from different angles has been calculated. The capability of moderation of liquid H2 is lower than H2O and liquid CH4 due to lower atomic number density of hydrogen but we can compensate for this disadvantage by using a premoderator. The H2O premoderator of 2cm thickness can reduce the heat deposition in the cold moderator by about 33% without spoiling the neutron pulse.
Keywords:  neutronic studies      spallation neutron source      moderator  
Received:  09 August 2004      Published:  02 March 2005
PACS:  29.25.Dz (Neutron sources)  
  28.41.Pa (Moderators)  
  24.10.Lx (Monte Carlo simulations (including hadron and parton cascades and string breaking models))  
  21.60.Ka (Monte Carlo models)  
  25.40.Sc (Spallation reactions)  
  29.30.Hs (Neutron spectroscopy)  

Cite this article: 

Yin Wen, Liang Jiu-Qing Neutronic studies of the coupled moderators for spallation neutron sources 2005 Chin. Phys. 14 500

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