How to Specify Materials/Particles in Detector Geometry

How to Specify Particles

In our experiment we declared our particle which is a muon because we are interested in the particles withing cosmic ray's The G4ParticleTable class is provided as a dictionary of particles. Various utility methods are provided, such as:

FindParticle(G4String name);         // find the particle by name
FindParticle(G4int PDGencoding)      // find the particle by PDG encoding .

G4ParticleTable is defined as a singleton object, and the static method G4ParticleTable::GetParticleTable() provides its pointer. However in our code we declared a muon by

G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
 G4String particleName;
 G4ParticleDefinition* particle
   = particleTable->FindParticle(particleName="mu+");
 fParticleGun->SetParticleDefinition(particle);
 //fParticleGun->SetParticleMomentumDirection(G4ThreeVector(xcosine,ycosine,zcosine));
 // fParticleGun->SetParticleEnergy(e0);

Particles are registered automatically during construction. The user has no control over particle registration.

Dictionary of Particles

The G4ParticleTable class is provided as a dictionary of particles. Various utility methods are provided, such as:

FindParticle(G4String name);         // find the particle by name

FindParticle(G4int PDGencoding) // find the particle by PDG encoding . G4ParticleTable is defined as a singleton object, and the static method G4ParticleTable::GetParticleTable() provides its pointer.

As for heavy ions (including hyper-nuclei), objects are created dynamically by requests from users and processes. The G4ParticleTable class provides methods to create ions, such as:

G4ParticleDefinition* GetIon(  G4int    atomicNumber,  
                              G4int    atomicMass, 
                              G4double   excitationEnergy);