|Message: Re: Near thermal Neutron simulation problem||Not Logged In (login)|
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At a first look, your physics list essentially used Low Energy Parameterized (LEP) modeling, as is normally present in LHEP physics list. You do have a different high energy model, but this is irrelevant for your energy range.
The LHEP models will not give a good description of neutron spectra for proton beam. You need to include a cascade model ( either Binary Casacde, or Bertini Casacade, for a beam of protons of 100 MeV I expect Binary to give slightly better agreement with data). If low energy neutrons (and thermal is very low energy!) are important, then you must also include the HP neutron model.
I recommend you use one of the physics lists distributed with Geant4, for your application this could be QGSP_BIC_HP or QGSP_BERT_HP. For (still incomplete) documentation on these lists, see http://geant4.cern.ch/support/proc_mod_catalog/physics_lists/physicsLists.shtml
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