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Question Discrepancies in the neutron production between G4.9.4.p01 and G4.9.3.p02 using QGSP_BERT_HP 

Forum: Hadronic Processes
Date: 20 May, 2011
From: Daniel Matthiń <Daniel Matthiń>

Dear community,
in the simulation of neutron production in the atmosphere by cosmic rays I am observing large discrepancies between GEANT4.9.4.p01 and GEANT4.9.3.p02 using the physics list QGSP_BERT_HP.
I have attached a figure showing the neutron flux at 10 km altitude produced by 10GeV protons on top of the atmosphere. Especially the edge at neutron energies of 0.1MeV is something I have never observed before.
Maybe someone could comment on that.
Thank you very much for your help.
Daniel

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      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/05/20/00.47-79306-fig1.gif

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