|Message: Re: How to include angular correlation in Co-60||Not Logged In (login)|
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If G4RadioactiveDecay process is included in you physics list, you can specify Co-60 as your primary, via G4ParticleGun or G4GeneralParticleSource, and Geant4 will simulate the decay of the Co-60 and this will lead to the generation of the two gammas. You are right that there is currently no angular correlation between the two gammas as they are generated randomly and indpendently in angle. The specific class responsible for the gamma decays is G4PhotonEvaporation(). You need to modify this class or the associated classes to add the angular correlation.
If you are just interested in simulating the two gammas from Co-60, it may be simpler to construct your own particle gun to fire two correlated gammas directly, instead of starting with Co-60 and rely on G4RadioactiveDecay to produce the two gammas.