|Message: Re: Can we apply the boundary process to gamma-ray photons? If we can, and how to do it?||Not Logged In (login)|
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email@example.com writes: > Since the optical photons can be assigned whatever energy we wish. I > think for the photons with given energy, if we want to simulate their > boundary processes we can set the photons as "opticalphoton" and define > the corresponding optical material properties; if we want to simulate > their EM and photo-nuclear processes we can set the photons as "gamma". > > Do you think so? Sort of. You cannot change the "type" of a particle after the G4Track has been created -- G4OpticalPhoton and G4Gamma are two different objects, with different data members and different pointers (addresses). Also, processes _create_ new secondary particles, and those new secondaries will be created according to how the process has been written. If a process (like photoevaporation) creates a photon, it is _always_ going to create a G4Gamma. If you want to write your own process, which duplicates what photo-evaporation does, but creates G4OpticalPhotons, you're free to do that and put it into your own physics list. See the GEANT4 Toolkit Developer's Guide. But that is not going to be easy, nor will we be able to help you very much with the outcome. What you *could* do for your own study is to use the particle gun to generate primary particles (either "gamma" or "opticalphoton"), and just study how they propagate through your geometry. -- Michael Kelsey