source: trunk/source/processes/electromagnetic/lowenergy/src/G4CrossSectionChargeDecrease.cc @ 989

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// $Id: G4CrossSectionChargeDecrease.cc,v 1.4 2008/07/14 20:47:34 sincerti Exp $
// GEANT4 tag $Name: geant4-09-02-ref-02 $

#include "G4CrossSectionChargeDecrease.hh"

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G4CrossSectionChargeDecrease::G4CrossSectionChargeDecrease()
{
  lowEnergyLimitDefault = 1 * keV;
  highEnergyLimitDefault = 10 * MeV;

  G4DNAGenericIonsManager *instance;
  instance = G4DNAGenericIonsManager::Instance();
  G4ParticleDefinition* protonDef = G4Proton::ProtonDefinition();
  G4ParticleDefinition* alphaPlusPlusDef = instance->GetIon("alpha++");
  G4ParticleDefinition* alphaPlusDef = instance->GetIon("alpha+");

  G4String proton;
  G4String alphaPlusPlus;
  G4String alphaPlus;

  if (protonDef != 0)
  {
    proton = protonDef->GetParticleName();
    lowEnergyLimit[proton] = 1. * keV;
    highEnergyLimit[proton] = 10. * MeV;
  }
  else
  {
    G4Exception("G4CrossSectionChargeDecrease Constructor: proton is not defined");
  }

  if (alphaPlusPlusDef != 0)
  {
    alphaPlusPlus = alphaPlusPlusDef->GetParticleName();
    lowEnergyLimit[alphaPlusPlus] = 1. * keV;
    highEnergyLimit[alphaPlusPlus] = 10. * MeV;
  }
  else
  {
    G4Exception("G4CrossSectionChargeDecrease Constructor: alphaPlusPlus is not defined");
  }

  if (alphaPlusDef != 0)
  {
    alphaPlus = alphaPlusDef->GetParticleName();
    lowEnergyLimit[alphaPlus] = 1. * keV;
    highEnergyLimit[alphaPlus] = 10. * MeV;
  }
  else
  {
    G4Exception("G4CrossSectionChargeDecrease Constructor: alphaPlus is not defined");
  }

}

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G4CrossSectionChargeDecrease::~G4CrossSectionChargeDecrease()
{}
 
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G4double G4CrossSectionChargeDecrease::CrossSection(const G4Track& track)
{
  G4double lowLim = lowEnergyLimitDefault;
  G4double highLim = highEnergyLimitDefault;

  const G4DynamicParticle* particle = track.GetDynamicParticle();
  G4double k = particle->GetKineticEnergy();

  const G4ParticleDefinition* particleDefinition = track.GetDefinition();
  
  const G4String& particleName = particleDefinition->GetParticleName();

  G4DNAGenericIonsManager *instance;
  instance = G4DNAGenericIonsManager::Instance();

  if (
      particleDefinition != G4Proton::ProtonDefinition()
      &&
      particleDefinition != instance->GetIon("alpha++")
      &&
      particleDefinition != instance->GetIon("alpha+")
      )
            
    G4Exception("G4CrossSectionChargeDecrease: attempting to calculate cross section for wrong particle");

  std::map< G4String,G4double,std::less<G4String> >::iterator pos1;
  pos1 = lowEnergyLimit.find(particleName);

  if (pos1 != lowEnergyLimit.end())
  {
    lowLim = pos1->second;
  }

  std::map< G4String,G4double,std::less<G4String> >::iterator pos2;
  pos2 = highEnergyLimit.find(particleName);

  if (pos2 != highEnergyLimit.end())
  {
    highLim = pos2->second;
  }

  G4double crossSection(0.);
  if (k >= lowLim && k <= highLim)
  {
      crossSection = partialCrossSection.Sum(k,particleDefinition);
  }
 
  return crossSection;
}