What’s the corresponding substitute of G4QStoppingPhysics in Geant4 10.4.2


I am doing the migration from Geant4.9.3 to Geant4.10.4.

In Geant4.9.3.2, we construct our physics process with the following 9 package like this:

RegisterPhysics( new G4EmStandardPhysics());
RegisterPhysics( new G4EmExtraPhysics(“extra EM”));
RegisterPhysics( new ourselfOPPhysics(“standard OP”));
RegisterPhysics( new G4HadronElasticPhysics(“LElastic”,1,false));
RegisterPhysics( new HadronPhysicsQGSP_FTFP_BERT(“hadron”,true));
RegisterPhysics( new G4IonPhysics(“ion_bic”));
RegisterPhysics( new G4QStoppingPhysics(“stopping”));
RegisterPhysics( new G4DecayPhysics(“decay”,1));

In Geant, the corresponding physics process are
RegisterPhysics(new G4EmStandardPhysics());
RegisterPhysics(new G4EmExtraPhysics(verb));
RegisterPhysics(new ourselfOPPhysics(“standard OP”));
RegisterPhysics(new G4HadronElasticPhysics(verb) );
RegisterPhysics(new G4HadronPhysicsQGSP_FTFP_BERT(verb));
RegisterPhysics(new G4IonPhysics(verb));
RegisterPhysics(new G4StoppingPhysics(verb));
RegisterPhysics(new G4DecayPhysics());

However, when we compare the number of Cerenkov collected by the sensitive detector, there exist around 20% difference, Geant4.9.3.2 has more Ncerenov than Geant4.10.4.2. Does anyone has some suggestions or comments on this issue?

Thank you in advance, Min


I am sorry for the late reply. It is possible, that EM and hadronic physics is changed between 9.3 and 10.4 and tsuch change may change energy depositions and number of Cerenkov photons. StoppingPhysics is the last, which may affect Cerenkov yield.