G4DecayProducts.cc

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//
// G4DecayProducts class implementation
//
// Author: H.Kurashige, 12 July 1996
// ------------------------------------------------------------
 
#include "G4ios.hh"
#include "globals.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4DecayProducts.hh"
 
#include "G4LorentzVector.hh"
#include "G4LorentzRotation.hh"
 
G4DecayProducts::G4DecayProducts()
{ 
  theProductVector = new G4DecayProductVector();
}
 
G4DecayProducts::G4DecayProducts(const G4DynamicParticle& aParticle)
{
  theParentParticle = new G4DynamicParticle(aParticle);
  theProductVector = new G4DecayProductVector();
}
 
G4DecayProducts::G4DecayProducts(const G4DecayProducts& right) 
{
  theProductVector = new G4DecayProductVector();
 
  // copy parent (Deep Copy)
  theParentParticle = new G4DynamicParticle(*right.theParentParticle);
 
  //copy daughters (Deep Copy)
  for (G4int index=0; index<right.numberOfProducts; ++index)
  {
    G4DynamicParticle* daughter = right.theProductVector->at(index);
    G4DynamicParticle* pDaughter =  new G4DynamicParticle(*daughter);
 
    G4double properTime = daughter->GetPreAssignedDecayProperTime();
    if(properTime>0.0) pDaughter->SetPreAssignedDecayProperTime(properTime); 
 
    const G4DecayProducts* pPreAssigned
      = daughter->GetPreAssignedDecayProducts();
    if (pPreAssigned != nullptr)
    {
      G4DecayProducts* pPA = new G4DecayProducts(*pPreAssigned);
      pDaughter->SetPreAssignedDecayProducts(pPA);
    }
    theProductVector->push_back( pDaughter );
  }
  numberOfProducts = right.numberOfProducts;
}
 
G4DecayProducts& G4DecayProducts::operator=(const G4DecayProducts& right)
{
  G4int index;
 
  if (this != &right)
  { 
    // recreate parent
    if (theParentParticle != nullptr) delete theParentParticle;
    theParentParticle = new G4DynamicParticle(*right.theParentParticle);
 
    // delete G4DynamicParticle objects
    for (index=0; index<numberOfProducts; ++index)
    {
      delete theProductVector->at(index);
    }
    theProductVector->clear();
 
    //copy daughters (Deep Copy)
    for (index=0; index<right.numberOfProducts; ++index)
    {
      G4DynamicParticle* daughter = right.theProductVector->at(index);
      G4DynamicParticle* pDaughter =  new G4DynamicParticle(*daughter);
 
      G4double properTime = daughter->GetPreAssignedDecayProperTime();
      if(properTime>0.0) pDaughter->SetPreAssignedDecayProperTime(properTime); 
      
      const G4DecayProducts* pPreAssigned
        = daughter->GetPreAssignedDecayProducts();
      if (pPreAssigned != nullptr)
      {
        G4DecayProducts* pPA = new G4DecayProducts(*pPreAssigned);
        pDaughter->SetPreAssignedDecayProducts(pPA);
      }
      theProductVector->push_back( pDaughter );
    } 
    numberOfProducts = right.numberOfProducts;
  }
  return *this;
}
 
G4DecayProducts::~G4DecayProducts()
{
  //delete parent
  if (theParentParticle != nullptr) delete theParentParticle;
  theParentParticle = nullptr;
 
  // delete G4DynamicParticle object
  for (G4int index=0; index<numberOfProducts; ++index)
  {
    delete theProductVector->at(index);
  }
  theProductVector->clear();
  numberOfProducts = 0;    
  delete theProductVector;
  theProductVector = nullptr;
}
 
G4DynamicParticle* G4DecayProducts::PopProducts()
{
  if ( numberOfProducts >0 )
  {
    numberOfProducts -= 1;   
    G4DynamicParticle* part = theProductVector->back();
    theProductVector->pop_back();
    return part;
  }
  else
  {
    return nullptr;
  }
}
 
G4int G4DecayProducts::PushProducts(G4DynamicParticle* aParticle)
{
  theProductVector->push_back(aParticle);
  numberOfProducts += 1; 
  return numberOfProducts;
}
 
G4DynamicParticle* G4DecayProducts::operator[](G4int anIndex) const
{
  if ((numberOfProducts > anIndex) && (anIndex >=0) )
  {
    return  theProductVector->at(anIndex);
  }
  else
  {
    return nullptr;
  }
}
 
void G4DecayProducts::SetParentParticle(const G4DynamicParticle& aParticle)
{
  if (theParentParticle != nullptr) delete theParentParticle;
  theParentParticle = new G4DynamicParticle(aParticle);
}
 
 
void G4DecayProducts::Boost(G4double totalEnergy,
                            const G4ThreeVector& momentumDirection)
{
  // calculate new beta
  G4double mass = theParentParticle->GetMass();
  G4double totalMomentum(0);
  if ( totalEnergy > mass )
  {
    totalMomentum  = std::sqrt( (totalEnergy - mass)*(totalEnergy + mass) );
  }
  G4double betax = momentumDirection.x()*totalMomentum/totalEnergy;  
  G4double betay = momentumDirection.y()*totalMomentum/totalEnergy;  
  G4double betaz = momentumDirection.z()*totalMomentum/totalEnergy;  
  Boost(betax, betay, betaz);
}
 
void G4DecayProducts::Boost(G4double newbetax,
                            G4double newbetay,
                            G4double newbetaz)
{ 
  G4double mass = theParentParticle->GetMass();
  G4double energy  = theParentParticle->GetTotalEnergy();
  G4double momentum  = 0.0;
 
  G4ThreeVector direction(0.0,0.0,1.0);    
  G4LorentzVector p4;
 
  if (energy - mass > DBL_MIN)
  {
    // calcurate  beta of initial state
    momentum  = theParentParticle->GetTotalMomentum();
    direction = theParentParticle->GetMomentumDirection();
    G4double betax = -1.0*direction.x()*momentum/energy;  
    G4double betay = -1.0*direction.y()*momentum/energy;  
    G4double betaz = -1.0*direction.z()*momentum/energy;  
    
    for (G4int index=0; index<numberOfProducts; ++index)
    {
      // make G4LorentzVector for secondaries
      p4 = (theProductVector->at(index))->Get4Momentum();
 
      // boost secondaries to theParentParticle's rest frame 
      p4.boost(betax, betay, betaz);
 
      // boost secondaries to  new frame 
      p4.boost(newbetax, newbetay, newbetaz);
 
      // change energy/momentum
      (theProductVector->at(index))->Set4Momentum(p4);
    }
  }
  else
  {
    for (G4int index=0; index<numberOfProducts; ++index)
    {
      // make G4LorentzVector for secondaries
      p4 = (theProductVector->at(index))->Get4Momentum();
 
      // boost secondaries to  new frame 
      p4.boost(newbetax, newbetay, newbetaz);
 
      // change energy/momentum
      (theProductVector->at(index))->Set4Momentum(p4);
    }
  }
 
  // make G4LorentzVector for parent in its rest frame
  mass = theParentParticle->GetMass();
  G4LorentzVector parent4( 0.0, 0.0, 0.0, mass);
 
  // boost parent to new frame 
  parent4.boost(newbetax, newbetay, newbetaz);
 
  // change energy/momentum
  theParentParticle->Set4Momentum(parent4);
}
 
G4bool G4DecayProducts::IsChecked() const
{
  G4bool returnValue = true;
 
  // check parent 
  // energy/momentum
  G4double parent_energy  = theParentParticle->GetTotalEnergy();
  G4ThreeVector direction = theParentParticle->GetMomentumDirection();
  G4ThreeVector parent_momentum
    = direction*(theParentParticle->GetTotalMomentum());
 
  // check momentum direction is a unit vector
  if ((parent_momentum.mag() >0.0) && (std::fabs(direction.mag()-1.0) >1.0e-6))
  {
#ifdef G4VERBOSE
    G4cout << "G4DecayProducts::IsChecked()::  "
           << " Momentum Direction Vector of Parent is not normalized "
           << "  (=" << direction.mag() << ")" << G4endl;
#endif
    returnValue = false;
    parent_momentum = parent_momentum * (1./direction.mag());
  }
 
  // daughters
  G4double mass, energy;
  G4ThreeVector momentum;
  G4double total_energy = parent_energy;
  G4ThreeVector total_momentum = parent_momentum;
 
  for (G4int index=0; index < numberOfProducts; ++index)
  {
    G4DynamicParticle* part = theProductVector->at(index);
    mass = part->GetMass();
    energy = part->GetTotalEnergy();
    direction = part->GetMomentumDirection();
    momentum = direction*(part->GetTotalMomentum());
 
    // check momentum direction is a unit vector
    if ( (momentum.mag()>0.0) && (std::fabs(direction.mag()-1.0) > 1.0e-6))
    {
#ifdef G4VERBOSE
      G4cout <<  "G4DecayProducts::IsChecked()::  "
             << " Momentum Direction Vector of Daughter [" << index
             << "]  is not normalized (=" << direction.mag() << ")" << G4endl;
#endif
      returnValue = false;
      momentum = momentum * (1./direction.mag());
    }
    // whether daughter stops or not
    if (energy - mass < DBL_MIN )
    {
#ifdef G4VERBOSE
      G4cout <<  "G4DecayProducts::IsChecked()::  "
             << "  Daughter [" << index << "] has no kinetic energy "<< G4endl;
#endif
      returnValue = false;
    }
    total_energy -= energy; 
    total_momentum -= momentum;
  }
  // check energy/momentum conservation
  if ( (std::fabs(total_energy) >1.0e-9*MeV)
    || (total_momentum.mag() >1.0e-9*MeV ) )
  { 
#ifdef G4VERBOSE
    G4cout <<  "G4DecayProducts::IsChecked()::  "
           << " Energy/Momentum is not conserved   "<< G4endl;
    G4cout << " difference between parent energy & sum of daughters energy: "
           << total_energy /MeV << "[MeV]  " << G4endl;
    G4cout << " difference between parent momentum & sum of daughters momentum: "
           << " x:" << total_momentum.getX()/MeV
           << " y:" << total_momentum.getY()/MeV
           << " z:" << total_momentum.getZ()/MeV
           << G4endl;
#endif
    returnValue = false;
  }
  return returnValue;
}
 
void G4DecayProducts::DumpInfo() const
{
   G4cout << " ----- List of DecayProducts  -----" << G4endl;
   G4cout << " ------ Parent Particle ----------" << G4endl;
   if (theParentParticle != 0) theParentParticle->DumpInfo();
   G4cout << " ------ Daughter Particles  ------" << G4endl;  
   for (G4int index=0; index<numberOfProducts; ++index)
   {
     G4cout << " ----------" << index+1 << " -------------" << G4endl;  
     (theProductVector->at(index))-> DumpInfo();
   }
   G4cout << " ----- End List of DecayProducts  -----" << G4endl;
   G4cout << G4endl;
}