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Forum: Hadronic Processes
Re: Question Strange (?) secondaries in inelastic and quasi-elastic scattering (Eleni Petrakou)
Date: 14 Jun, 2016
From: Dennis H. Wright <Dennis H. Wright>

Yes, quasi-elastic processes are included as inelastic in Geant4, and the primary gets killed in the interaction.

1. Your first plot shows the expected peak from quasi-elastic protons. Even though the original proton is killed, its energy is largely preserved in the model and transferred to one of the produced secondaries. The peak is broadened due to intra-nuclear interactions. So no primaries survive, but one of the secondary protons has close to the original energy. The only way to fish them out would be to select secondaries within some energy range around the peak energy.

2. Again, the initial protons are killed and do not survive the interaction. In many cases it looks like the primary survives, but it is actually a secondary. This is a Geant4 convention for hadronic interactions.

3. Currently Geant4 cannot accurately tag a quasi-elastic secondary. Some work has been done to separate quasi-elastic from inelastic processes, but this is not yet complete.

4. I'm not sure what this is, but it does look artificial. Which hadronic model/physics list/Geant4 version are you using?

5. It would depend on which model was being used, but I don't know of any such cut-off.

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1 Question: Re: Strange (?) secondaries in inelastic and quasi-elastic scattering   (Eleni Petrakou - 16 Jun, 2016)
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