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// $Id: G4FinalStatePsCreationChampion.cc,v 1.2 2009/06/10 13:32:36 mantero Exp $
// GEANT4 tag $Name: geant4-09-04-ref-00 $
// -------------------------------------------------------------------

#include "G4FinalStatePsCreationChampion.hh"

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G4FinalStatePsCreationChampion::G4FinalStatePsCreationChampion()
{
  lowEnergyLimit = 10. * eV;
  highEnergyLimit = 5. * keV;

  G4ParticleDefinition* positronDef = G4Positron::PositronDefinition();

  if (positronDef == 0) G4Exception("G4FinalStatePsCreationChampion constructor: positron is not defined");
}

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

G4FinalStatePsCreationChampion::~G4FinalStatePsCreationChampion()
{}

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

const G4FinalStateProduct& G4FinalStatePsCreationChampion::GenerateFinalState(const G4Track& track, const G4Step& /* step */)
{
  product.Clear();

  const G4DynamicParticle* particle = track.GetDynamicParticle();

  G4double k = particle->GetKineticEnergy();

  if (k > lowEnergyLimit && k < highEnergyLimit)
  {
      G4ParticleDefinition* definition = particle->GetDefinition();
      G4ParticleMomentum primaryDirection = particle->GetMomentumDirection();

      G4int positroniumState = cross.RandomSelectState(k,definition);
      
      G4int ionizationShell = cross.RandomSelectShell(k,definition,positroniumState);
        
      G4double bindingEnergy = waterStructure.IonisationEnergy(ionizationShell);
      
      G4double creationEnergy = 13.6*eV/(2*(positroniumState+1)*(positroniumState+1)) ; // Ry = 13.6 * eV;
      
      G4double secondaryKinetic = k + creationEnergy - bindingEnergy; 

      product.KillPrimaryParticle();
      product.AddEnergyDeposit(bindingEnergy-creationEnergy);

      G4DNAGenericIonsManager * instance(G4DNAGenericIonsManager::Instance());
      
      if (secondaryKinetic<0) 
      {
        G4cout << "***** WARNING in G4FinalStatePsCreationChampion: Ps secondaryKinetic < 0 --> set to zero " << G4endl; 
        secondaryKinetic=0; 
      }
      
      if (positroniumState == 0) 
      product.AddSecondary 
       (new G4DynamicParticle(instance->GetIon("Ps-1s"),track.GetDynamicParticle()->GetMomentumDirection(),secondaryKinetic));
      
      if (positroniumState == 1) 
      product.AddSecondary 
      (new G4DynamicParticle(instance->GetIon("Ps-2s"),track.GetDynamicParticle()->GetMomentumDirection(),secondaryKinetic));

  }
  
  return product;
}