source: trunk/source/processes/hadronic/models/de_excitation/evaporation/src/G4Evaporation.cc @ 843

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// $Id: G4Evaporation.cc,v 1.7 2007/02/14 13:37:49 ahoward Exp $
// GEANT4 tag $Name:  $
//
// Hadronic Process: Nuclear De-excitations
// by V. Lara (Oct 1998)
//
// Alex Howard - added protection for negative probabilities in the sum, 14/2/07
//
#include "G4Evaporation.hh"
#include "G4EvaporationFactory.hh"
#include "G4EvaporationGEMFactory.hh"
#include "G4HadronicException.hh"
#include <numeric>

G4Evaporation::G4Evaporation() 
{
  theChannelFactory = new G4EvaporationFactory();
  theChannels = theChannelFactory->GetChannel();
}

G4Evaporation::G4Evaporation(const G4Evaporation &) : G4VEvaporation()
{
    throw G4HadronicException(__FILE__, __LINE__, "G4Evaporation::copy_constructor meant to not be accessable.");
}


G4Evaporation::~G4Evaporation()
{
  if (theChannels != 0) theChannels = 0;
  if (theChannelFactory != 0) delete theChannelFactory;
}

const G4Evaporation & G4Evaporation::operator=(const G4Evaporation &)
{
    throw G4HadronicException(__FILE__, __LINE__, "G4Evaporation::operator= meant to not be accessable.");
    return *this;
}


G4bool G4Evaporation::operator==(const G4Evaporation &) const
{
    return false;
}

G4bool G4Evaporation::operator!=(const G4Evaporation &) const
{
    return true;
}


void G4Evaporation::SetDefaultChannel()
{
  if (theChannelFactory != 0) delete theChannelFactory;
  theChannelFactory = new G4EvaporationFactory();
  theChannels = theChannelFactory->GetChannel();
}

void G4Evaporation::SetGEMChannel()
{
  if (theChannelFactory != 0) delete theChannelFactory;
  theChannelFactory = new G4EvaporationGEMFactory();
  theChannels = theChannelFactory->GetChannel();
}


G4FragmentVector * G4Evaporation::BreakItUp(const G4Fragment &theNucleus)
{
    G4FragmentVector * theResult = new G4FragmentVector;

    // CHECK that Excitation Energy != 0
    if (theNucleus.GetExcitationEnergy() <= 0.0) {
        theResult->push_back(new G4Fragment(theNucleus));
        return theResult;
    }

    // The residual nucleus (after evaporation of each fragment)
    G4Fragment theResidualNucleus = theNucleus;

    // Number of channels
    G4int TotNumberOfChannels = theChannels->size();  
        

    // Starts loop over evaporated particles
    for (;;) 
      {
        // loop over evaporation channels
        std::vector<G4VEvaporationChannel*>::iterator i;
        for (i=theChannels->begin(); i != theChannels->end(); i++) 
          {
            (*i)->Initialize(theResidualNucleus);
          }
        // Can't use this form beacuse Initialize is a non const member function
        //      for_each(theChannels->begin(),theChannels->end(),
        //               bind2nd(mem_fun(&G4VEvaporationChannel::Initialize),theResidualNucleus));
        // Work out total decay probability by summing over channels 
        G4double TotalProbability =  std::accumulate(theChannels->begin(),
                                                       theChannels->end(),
                                                       0.0,SumProbabilities());
        
        if (TotalProbability <= 0.0) 
          {
            // Will be no evaporation more
            // write information about residual nucleus
            theResult->push_back(new G4Fragment(theResidualNucleus));
            break; 
          } 
        else 
          {
            // Selection of evaporation channel, fission or gamma
            // G4double * EmissionProbChannel = new G4double(TotNumberOfChannels);
            std::vector<G4double> EmissionProbChannel;
            EmissionProbChannel.reserve(theChannels->size());
            

            // EmissionProbChannel[0] = theChannels->at(0)->GetEmissionProbability();


            G4double first = theChannels->front()->GetEmissionProbability();

            EmissionProbChannel.push_back(first >0 ? first : 0); // index 0


            //      EmissionProbChannel.push_back(theChannels->front()->GetEmissionProbability()); // index 0
            
            for (i= (theChannels->begin()+1); i != theChannels->end(); i++) 
              {
                // EmissionProbChannel[i] = EmissionProbChannel[i-1] + 
                // theChannels->at(i)->GetEmissionProbability();
                //              EmissionProbChannel.push_back(EmissionProbChannel.back() + (*i)->GetEmissionProbability());
                first = (*i)->GetEmissionProbability();
                EmissionProbChannel.push_back(first> 0? EmissionProbChannel.back() + first : EmissionProbChannel.back());
              }

            G4double shoot = G4UniformRand() * TotalProbability;
            G4int j;
            for (j=0; j < TotNumberOfChannels; j++) 
              {
                // if (shoot < EmissionProbChannel[i]) 
                if (shoot < EmissionProbChannel[j]) 
                  break;
              }
            
            // delete [] EmissionProbChannel;
            EmissionProbChannel.clear();
                        
            if( j >= TotNumberOfChannels ) 
              {
                throw G4HadronicException(__FILE__, __LINE__,  "G4Evaporation::BreakItUp: Can't define emission probability of the channels!" );
              } 
            else 
              {
                // Perform break-up
                G4FragmentVector * theEvaporationResult = (*theChannels)[j]->BreakUp(theResidualNucleus);

#ifdef debug
                G4cout <<           "-----------------------------------------------------------\n"; 
                G4cout << G4endl << " After the evaporation of a particle, testing conservation \n";
                CheckConservation(theResidualNucleus,theEvaporationResult);
                G4cout << G4endl 
                       <<           "------------------------------------------------------------\n"; 
#endif  

                // Check if chosen channel is fission (there are only two EXCITED fragments)
                // or the channel could not evaporate anything
                if ( theEvaporationResult->size() == 1 || 
                     ((*(theEvaporationResult->begin()))->GetExcitationEnergy() > 0.0 && 
                      (*(theEvaporationResult->end()-1))->GetExcitationEnergy() > 0.0) ) {
                  // FISSION 
                  for (G4FragmentVector::iterator i = theEvaporationResult->begin();
                       i != theEvaporationResult->end(); ++i) 
                    {
                      theResult->push_back(*(i));
                    }
                  delete theEvaporationResult;
                  break;
                } else {
                  // EVAPORATION
                  for (G4FragmentVector::iterator i = theEvaporationResult->begin();
                       i != theEvaporationResult->end()-1; ++i) 
                    {
#ifdef PRECOMPOUND_TEST
                      if ((*i)->GetA() == 0) (*i)->SetCreatorModel(G4String("G4PhotonEvaporation"));
#endif
                      theResult->push_back(*(i));
                    }
                  theResidualNucleus = *(theEvaporationResult->back());
                  delete theEvaporationResult->back();
                  delete theEvaporationResult;
#ifdef PRECOMPOUND_TEST
                  theResidualNucleus.SetCreatorModel(G4String("ResidualNucleus"));
#endif
                }
              }
          }
      }
    
#ifdef debug
    G4cout << "======== Evaporation Conservation Test ===========\n"
           << "==================================================\n";
    CheckConservation(theNucleus,theResult);
    G4cout << "==================================================\n";
#endif
    return theResult;
}



#ifdef debug
void G4Evaporation::CheckConservation(const G4Fragment & theInitialState,
                                      G4FragmentVector * Result) const
{
    G4double ProductsEnergy =0;
    G4ThreeVector ProductsMomentum;
    G4int ProductsA = 0;
    G4int ProductsZ = 0;
    for (G4FragmentVector::iterator h = Result->begin(); h != Result->end(); h++) {
        G4LorentzVector tmp = (*h)->GetMomentum();
        ProductsEnergy += tmp.e();
        ProductsMomentum += tmp.vect();
        ProductsA += static_cast<G4int>((*h)->GetA());
        ProductsZ += static_cast<G4int>((*h)->GetZ());
    }

    if (ProductsA != theInitialState.GetA()) {
        G4cout << "!!!!!!!!!! Baryonic Number Conservation Violation !!!!!!!!!!" << G4endl;
        G4cout << "G4Evaporation.cc: Barionic Number Conservation test for evaporation fragments" 
               << G4endl; 
        G4cout << "Initial A = " << theInitialState.GetA() 
               << "   Fragments A = " << ProductsA << "   Diference --> " 
               << theInitialState.GetA() - ProductsA << G4endl;
    }
    if (ProductsZ != theInitialState.GetZ()) {
        G4cout << "!!!!!!!!!! Charge Conservation Violation !!!!!!!!!!" << G4endl;
        G4cout << "G4Evaporation.cc: Charge Conservation test for evaporation fragments" 
               << G4endl; 
        G4cout << "Initial Z = " << theInitialState.GetZ() 
               << "   Fragments Z = " << ProductsZ << "   Diference --> " 
               << theInitialState.GetZ() - ProductsZ << G4endl;
    }
    if (std::abs(ProductsEnergy-theInitialState.GetMomentum().e()) > 1.0*keV) {
        G4cout << "!!!!!!!!!! Energy Conservation Violation !!!!!!!!!!" << G4endl;
        G4cout << "G4Evaporation.cc: Energy Conservation test for evaporation fragments" 
               << G4endl; 
        G4cout << "Initial E = " << theInitialState.GetMomentum().e()/MeV << " MeV"
               << "   Fragments E = " << ProductsEnergy/MeV  << " MeV   Diference --> " 
               << (theInitialState.GetMomentum().e() - ProductsEnergy)/MeV << " MeV" << G4endl;
    } 
    if (std::abs(ProductsMomentum.x()-theInitialState.GetMomentum().x()) > 1.0*keV || 
        std::abs(ProductsMomentum.y()-theInitialState.GetMomentum().y()) > 1.0*keV ||
        std::abs(ProductsMomentum.z()-theInitialState.GetMomentum().z()) > 1.0*keV) {
        G4cout << "!!!!!!!!!! Momentum Conservation Violation !!!!!!!!!!" << G4endl;
        G4cout << "G4Evaporation.cc: Momentum Conservation test for evaporation fragments" 
               << G4endl; 
        G4cout << "Initial P = " << theInitialState.GetMomentum().vect() << " MeV"
               << "   Fragments P = " << ProductsMomentum  << " MeV   Diference --> " 
               << theInitialState.GetMomentum().vect() - ProductsMomentum << " MeV" << G4endl;
    }
    return;
}
#endif