About Physics list in detection of gamma rays

Hi, soon i will have to make a simulation which consists of computing the HPGe detector efficiency for gamma rays.

What physics list do you think is important to use?

I would suggest to use G4EmStandard_Option4.
Probably you will have to model the radioactive decay if you intend to model the response for a radioactive source.

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Do you think only this option is enough?

The complete answer is that it really depends on the radiation field you intend to model and this information is missing. But in principle if you have a gamma source, this physics list should be enough. You can then calculate the edep in your detector.

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