|Message: Re: Best Ion treatment: G4IonFTFPBinaryCascadePhysics or G4IonQMDPhysics, and other questions from Shielding Physics||Not Logged In (login)|
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see comments below.
1. Shielding list uses G4IonQMDPhysics for ion treatment. Would it be wrong to use G4IonFTFPBinaryCascadePhysics instead? What are the differences in these models? Which is better under what circumstances?
QMD model in general more precise than the Binary cascade but is also much more CPU time consuming. QMD and Binary models should be used at relatively low energies. FTFP is capable to work above few GeV per nucleon ion projectile energy but it is still an alpha-version of the model.
2. Shielding list does not make use of G4NeutronTrackingCut in default configuration. When should it be engaged, if ever? Why?
Neutron tracking cut allowing to kill neutrons below energy threshold or above time threshold.
3. Some other models use alternative inelastic and capture cross sections from XS database added on top of existing physics list (G4NeutronCrossSectionXS). Specifically, this is done for Binary Cascade models. What is this "alternative" dataset and is there any relation to the JENDL data used for HadronPhysicsShielding? In other words, does it make any sense to talk about including this class as part of my physics setup? Will it improve the precision of neutron treatment?
G4NeutronCrossSectionXS is a fast version of HP cross sections.
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