GB03PrimaryGeneratorAction.cc

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// $Id$
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#include "GB03PrimaryGeneratorAction.hh"

#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "G4SystemOfUnits.hh"

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GB03PrimaryGeneratorAction::GB03PrimaryGeneratorAction()
 : G4VUserPrimaryGeneratorAction()
{
  G4int n_particle = 1;
  fParticleGun  = new G4ParticleGun(n_particle);
  
  // default particle kinematic
  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  G4String particleName;
  G4ParticleDefinition* particle
                    = particleTable->FindParticle(particleName="neutron");
  fParticleGun->SetParticleDefinition(particle);
  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
  fParticleGun->SetParticlePosition(G4ThreeVector(0.,0.,-3.5*m));
  fParticleGun->SetParticleEnergy(100.*MeV);
}

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GB03PrimaryGeneratorAction::~GB03PrimaryGeneratorAction()
{
  delete fParticleGun;
}

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void GB03PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  fParticleGun->GeneratePrimaryVertex(anEvent);
}

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