Way to combine two different physics lists

Physics Lists
1

_Geant4 Version:_11.1
_Operating System:_Windows
_Compiler/Version:_Visual Studio 2023
_CMake Version:_3.28

Hello, I am noob about Geant4.

Always thanks to all of experts in Geant4 forum.

I am trying to simulate the 1. spontaneous decay of Cf-252 source and 2. track the interaction of neutrons / gamma that are generated from spontaneous decay with sensitive(logical) detector (Li-6 detecotor).

Thanks to other guys, I could find the example of Hadr04 and rdecay01 for my intention.

// Hadr04 PhysicsList.cc

#include "PhysicsList.hh"

#include "G4SystemOfUnits.hh"
#include "G4UnitsTable.hh"

#include "NeutronHPphysics.hh"

// particles

#include "G4BosonConstructor.hh"
#include "G4LeptonConstructor.hh"
#include "G4MesonConstructor.hh"
#include "G4BosonConstructor.hh"
#include "G4BaryonConstructor.hh"
#include "G4IonConstructor.hh"
#include "G4ShortLivedConstructor.hh"

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

PhysicsList::PhysicsList()
{
  SetVerboseLevel(1);
  
  //add new units
  //
  new G4UnitDefinition( "mm2/g",  "mm2/g", "Surface/Mass", mm2/g);
  new G4UnitDefinition( "um2/mg", "um2/mg","Surface/Mass", um*um/mg);  
    
  // Neutron Physics
  RegisterPhysics( new NeutronHPphysics("neutronHP"));  
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void PhysicsList::ConstructParticle()
{
  G4BosonConstructor  pBosonConstructor;
  pBosonConstructor.ConstructParticle();

  G4LeptonConstructor pLeptonConstructor;
  pLeptonConstructor.ConstructParticle();

  G4MesonConstructor pMesonConstructor;
  pMesonConstructor.ConstructParticle();

  G4BaryonConstructor pBaryonConstructor;
  pBaryonConstructor.ConstructParticle();

  G4IonConstructor pIonConstructor;
  pIonConstructor.ConstructParticle();

  G4ShortLivedConstructor pShortLivedConstructor;
  pShortLivedConstructor.ConstructParticle();  
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void PhysicsList::SetCuts()
{
  SetCutValue(0*mm, "proton");
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

// rdecay01 PhysicsList.cc
/// \brief Implementation of the PhysicsList class
// 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

#include "PhysicsList.hh"
#include "G4UnitsTable.hh"
#include "G4ParticleTypes.hh"
#include "G4IonConstructor.hh"
#include "G4PhysicsListHelper.hh"
#include "G4Radioactivation.hh"
#include "G4SystemOfUnits.hh"
#include "G4NuclideTable.hh"
#include "G4LossTableManager.hh"
#include "G4UAtomicDeexcitation.hh"
#include "G4NuclideTable.hh"
#include "G4NuclearLevelData.hh"
#include "G4DeexPrecoParameters.hh"
#include "G4PhysListUtil.hh"
#include "G4EmBuilder.hh"
#include "G4HadronInelasticQBBC.hh"
#include "globals.hh"



//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

PhysicsList::PhysicsList()
{
  // instantiate Physics List infrastructure 
  //
  G4PhysListUtil::InitialiseParameters();
  
  // update G4NuclideTable time limit
  //
  const G4double meanLife = 1*picosecond;  
  G4NuclideTable::GetInstance()->SetMeanLifeThreshold(meanLife);  
  G4NuclideTable::GetInstance()->SetLevelTolerance(1.0*eV);

  // define flags for the atomic de-excitation module
  //
  G4EmParameters::Instance()->SetDefaults();
  G4EmParameters::Instance()->SetAugerCascade(true);
  G4EmParameters::Instance()->SetDeexcitationIgnoreCut(true);    

  // define flags for nuclear gamma de-excitation model
  //
  G4DeexPrecoParameters* deex = 
    G4NuclearLevelData::GetInstance()->GetParameters();
  deex->SetCorrelatedGamma(false);
  deex->SetStoreAllLevels(true);
  deex->SetInternalConversionFlag(true);	  
  deex->SetIsomerProduction(true);  
  deex->SetMaxLifeTime(meanLife);

  // set default cut in range value
  //
  /*G4HadronInelasticQBBC* hadronPhysics = new G4HadronInelasticQBBC();
  hadronPhysics->ConstructProcess();*/

  SetDefaultCutValue(1*mm);
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void PhysicsList::ConstructParticle()
{
  // minimal set of particles for EM physics and radioactive decay
  //
  G4EmBuilder::ConstructMinimalEmSet();
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void PhysicsList::ConstructProcess()
{
  AddTransportation();
  
  G4Radioactivation* radioactiveDecay = new G4Radioactivation();
  G4bool ARMflag = false;
  radioactiveDecay->SetARM(ARMflag);        //Atomic Rearangement
  G4PhysicsListHelper* ph = G4PhysicsListHelper::GetPhysicsListHelper();
  ph->RegisterProcess(radioactiveDecay, G4GenericIon::GenericIon());
  	  
  // EM physics constructor is not used in this example, so
  // it is needed to instantiate and to initialize atomic deexcitation
  
  G4LossTableManager* man = G4LossTableManager::Instance();
  G4VAtomDeexcitation* deex = man->AtomDeexcitation();
  if (nullptr == deex) {
     deex = new G4UAtomicDeexcitation();
     man->SetAtomDeexcitation(deex);
  }
  deex->InitialiseAtomicDeexcitation();

  SetDefaultCutValue(1 * mm);
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

I want to combine this two different physics lists but I couldn’t find the exact way to do.
Is it possible to combine this two different physicslists? If I can, could you let me know the examples or other stuffs for reference?

2

See “modular” PhysicsList in Hadr06, Hadr07, rdecay02 and few other …

3

Hello,

any PhysicsList is a combination of components (which called physics constructors) as you have shown in example Hadr06. I would recommend a more easy way how to use Physics List:

G4INSTALL/examples/extended/hadronic/Hadr00

It has much less code to define whatever you need and is the primary recommendation.

VI