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Keywords: (thermal?) Neutron siumulation problem
Forum: Physics List
Re: None Near thermal Neutron simulation problem (Alan Shippen)
Date: 29 Feb, 2008
From: Gunter Folger <Gunter Folger>

Hello,

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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