|Message: Re: Positron annihilation coordinates||Not Logged In (login)|
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I don't have the answer to your question. I only have a suggestion. What do you get if you plot instead the origin of one of the annihilation photons?
You can do that, for example, in StackingAction, where your only logic is that the particle is a gamma, with the GetCreatorProcess == "annihil" (and you histogram only one of the two gammas in the event).
Your logic looks reasonable but there is always a danger with using GetProcessDefinedStep. I am not saying this is the case with annihilation but G4 allows more than one process DoIt at the end of the step, so conceivably another process may limit the step and you still have annihilation. Have you checked that you get exactly the number of entries in your histogram as you've asked for events?
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