|Message: Re: gamma||Not Logged In (login)|
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Gamma are mainly produced by bremsstrahlung of electrons, which are produced as delta-electrons by hadrons. Their ParentID is above 1. When you request ParentID 1 you register only gamma from the first hadron inelastic interaction in an event. Note, that gamma from nuclear de-excitation may come from secondary hadron inelastic interacts as well. So, may be more optimal would be to exclude gammas which have parent particle types e- and e+ and do not use ParentID.
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