|Message: Getting primary event energy||Not Logged In (login)|
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I'm running a simulation in which I shoot neutrons into liquid argon and observe the recoiling argon nucleus. I've successfully adapted ExN02 to do this. I now want to be able to record the energy of the neutron when it interacts in the liquid, as many times it will already have scattered once in my apparatus and therefore will no longer have its initial energy.
I've tried adding code as described in http://geant4.slac.stanford.edu/Tips/ particularly part 1, "How can I get the information of the original primary particle?" but my code crashes. It compiles fine, but then when it tries to execute the following line:
T01TrackInformation* info = (T01TrackInformation*)(aStep->GetTrack()->GetUserInformation();
from TrackerSD.cc, it fails. Can someone help me figure out why it's doing this?
Many thanks, Hugh
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