|Message: Re: Possibilities of simulating dynamic targets||Not Logged In (login)|
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this is more a question related to geometry than physics. I suggest you to follow the geometry related forum. Can you please re-post your question (and my answer here) there?
In G4 it is possible to simulate "moving" geometry. In your specific case mass/shape change. There are two techniques for that: 1- You are free to modify geometry between runs. You can simulate a short run with few particles, modify the geometry do a second run and so on 2- Use parametrized volumes to recompute geometry based on event number.
Both techniques are covered in our tutorials in the advanced techniques for geometry. For example the most recent SLAC one covers the subject here: http://geant4.slac.stanford.edu/SLACTutorial14/Geometry3.pdf