|Message: Best Ion treatment: G4IonFTFPBinaryCascadePhysics or G4IonQMDPhysics, and other questions from Shielding Physics||Not Logged In (login)|
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I took Shielding modular physics list as the starting point of my physics setup. I an using the version that is based on FTFP_BERT, and I do not use LEND at all. I read the History files, found some web presentations ("Short Guide to Choosing Physics Lists"), checked with the physics manual, as well as with the manual for application developers, and I still have some questions.
Before I ask my questions, here is how the main part of my modular list looks:
// EM Physics this->RegisterPhysics( new G4EmLivermorePhysics(verbose));
// Synchroton Radiation & GN Physics this->RegisterPhysics( new G4EmExtraPhysics(verbose) );
// Decays this->RegisterPhysics( new G4DecayPhysics(verbose) ); this->RegisterPhysics( new G4RadioactiveDecayPhysics(verbose) );
// Hadron Elastic scattering this->RegisterPhysics( new G4HadronElasticPhysicsHP(verbose) );
// Hadron Physics this->RegisterPhysics(new HadronPhysicsShielding(verbose) );
// Stopping Physics this->RegisterPhysics( new G4QStoppingPhysics(verbose) );
// Ion Physics this->RegisterPhysics( new G4IonQMDPhysics(verbose));
Here are my questions:
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?
2. Shielding list does not make use of G4NeutronTrackingCut in default configuration. When should it be engaged, if ever? Why?
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?
Thank you very much, --Elena Novikova.
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