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Forum: Event and Track Management
Date: 02 Apr, 2008
From: AdamKl <AdamKl>

Hi everybody I am a Geant4 novice. I inject a particle into a dense medium and want to see what comes out. In addition I want to sort events according to reaction type that occured inside that medium. My primary particle is neutron and I am specially interested in elastic and inelastic scattering events. So I collect G4Track objects and try to recognise "who is who" in such a collection of tracks. but I have a problem with ID number of tracks. I noticed that in the process of inelastic scattering on a nucleus the primary neutron (with track ID=1) somehow vanishes, its kinetic energy drops to 0 and then reappears but described by the track with id number=2. I have no means to check if it is the same neutron or reemitted one...Does anyone know how actually the track id numbers behave? Is there any order in assigning numbers, which for example would correspond to time axis in the simulation or it is rather random? What happens with the track IDs during a binary collision? Another problem is storing pointers to generated tracks. I guess that after a particle produced stops in the material, its track is deleted and keeping pointer to non-exisiting track is not only senseless but also dangerous, since geant internals my use this memory block for holding another track. Am I right? So I copy all tracks created during the programm execution, keep them on the heap and then analyse them at the end of each event. I look only for particles with non-zero kinetic energies, just to avoid analysing particles that died in the simulation. But I discovered that copy constructor of G4Track is very simple one, although G4Track objects hold it secure? Perhaps you have better and a proven idea of how one could differentiate between various reactions? thanks and sorry for that long post Adam

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