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Question Physics processes and appearance of primary photons 

Forum: Physics List
Date: 27 Mar, 2015
From: Sourav Tarafdar <Sourav Tarafdar>

Dear experts,

Recently I noticed appearance of primary photons while running Geant4 for my defined geometry. My geometry consist of a long hollow cylinder filled with vacuum. The hollow part of the cylinder is filled with uniform magnetic field in Y direction. Then I transported nuclear fragments (including protons and neutrons) from Heavy Ion collisions. I used standalone generator for generating these to be transported nuclear fragments. While looking at the output of Geant4 the Parent ID of these nuclear fragments is assigned "0" which is what I expect. However the output of Geant4 also shows photons with Parent ID as "0" though I *absolutely did not* transport any photons through my Geant4 geometry. I used "FTFP_BERT" as physics process while running Geant4. The photons seems to appear in the magnetic field region. Any idea what could be the reason of appearance of primary photons ?

Further is there any way of dumping out what kind of processes are involved in production of secondaries in Geant4 ? Looking at https://geant4.web.cern.ch/geant4/UserDocumentation/UsersGuides/ForApplicationDeveloper/html/ch05.html it seems that there is a way in "G4StepPoint" but somehow I did not manage to figure out how to do it. If anyone can point to be a working example it will be really helpful.

Thanks -Sourav

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1 None: Re: Physics processes and appearance of primary photons   (John Apostolakis - 27 Mar, 2015)
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