|Message: Quite big disagreement of neutron moderate between MCNP and Geant4||Not Logged In (login)|
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I am using Geant4 to simulate the 2.25 MeV neutron source at the center of a heavy water ball. Geant4 shows the protons will be all absorbed when the radius larger than 60 cm. However, the MCNP shows even with radius 200 cm only 24% neutron were absorbed.
My codes originated from Hadr04, only changed the geometry from box to ball. If I don't use the capture process, I got almost the same result with MCNP
Any one has any idea about which one is right? My codes and the result were attached
Attachment: http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/07/08/10.18-6143-DetectorConstruction.cc http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2016/07/08/10.18-6637-result.jpg
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