G4ExcitationHandler.cc

Go to the documentation of this file.

//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
// $Id: G4ExcitationHandler.cc 94381 2015-11-13 10:17:06Z gcosmo $
//
// Hadronic Process: Nuclear De-excitations
// by V. Lara (May 1998)
//
//
// Modified:
// 30 June 1998 by V. Lara:
//      -Modified the Transform method for use G4ParticleTable and 
//       therefore G4IonTable. It makes possible to convert all kind 
//       of fragments (G4Fragment) produced in deexcitation to 
//       G4DynamicParticle
//      -It uses default algorithms for:
//              Evaporation: G4Evaporation
//              MultiFragmentation: G4StatMF 
//              Fermi Breakup model: G4FermiBreakUp
// 24 Jul 2008 by M. A. Cortes Giraldo:
//      -Max Z,A for Fermi Break-Up turns to 9,17 by default
//      -BreakItUp() reorganised and bug in Evaporation loop fixed
//      -Transform() optimised
// (September 2008) by J. M. Quesada. External choices have been added for :
//      -inverse cross section option (default OPTxs=3)
//      -superimposed Coulomb barrier (if useSICB is set true, by default it is false) 
// September 2009 by J. M. Quesada: 
//      -according to Igor Pshenichnov, SMM will be applied (just in case) only once.
// 27 Nov 2009 by V.Ivanchenko: 
//      -cleanup the logic, reduce number internal vectors, fixed memory leak.
// 11 May 2010 by V.Ivanchenko: 
//      -FermiBreakUp activated, used integer Z and A, used BreakUpFragment method for 
//       final photon deexcitation; used check on adundance of a fragment, decay 
//       unstable fragments with A <5
// 22 March 2011 by V.Ivanchenko: general cleanup and addition of a condition: 
//       products of Fermi Break Up cannot be further deexcited by this model 
// 30 March 2011 by V.Ivanchenko removed private inline methods, moved Set methods 
//       to the source
// 23 January 2012 by V.Ivanchenko general cleanup including destruction of 
//    objects, propagate G4PhotonEvaporation pointer to G4Evaporation class and 
//    not delete it here 

#include "G4ExcitationHandler.hh"
#include "G4SystemOfUnits.hh"
#include "G4LorentzVector.hh"
#include "G4NistManager.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleTypes.hh"
#include "G4Ions.hh"

#include "G4VMultiFragmentation.hh"
#include "G4VFermiBreakUp.hh"

#include "G4VEvaporation.hh"
#include "G4VEvaporationChannel.hh"
#include "G4Evaporation.hh"
#include "G4StatMF.hh"
#include "G4FermiBreakUp.hh"
#include "G4FermiFragmentsPool.hh"
#include "G4Pow.hh"

G4ExcitationHandler::G4ExcitationHandler():
  maxZForFermiBreakUp(9),maxAForFermiBreakUp(17),minEForMultiFrag(400*GeV),
  minExcitation(0.1*keV),OPTxs(3),useSICB(false),isEvapLocal(true)
{                                                                          
  theTableOfIons = G4ParticleTable::GetParticleTable()->GetIonTable();
  nist = G4NistManager::Instance();
  
  theMultiFragmentation = new G4StatMF();
  theFermiModel = new G4FermiBreakUp();
  theEvaporation = new G4Evaporation();
  thePhotonEvaporation = theEvaporation->GetPhotonEvaporation();
  thePool = G4FermiFragmentsPool::Instance();
  SetParameters();
  G4Pow::GetInstance();
  theResults.resize(60,0);
  results.resize(30,0);
  theEvapList.resize(30,0);
  thePhotoEvapList.resize(10,0);
  //G4cout << "### New handler " << this << G4endl;
}

G4ExcitationHandler::~G4ExcitationHandler()
{
  //G4cout << "### Delete handler " << this << G4endl;
  delete theMultiFragmentation;
  delete theFermiModel;
  if(isEvapLocal) { delete theEvaporation; } 
}

G4ReactionProductVector * 
G4ExcitationHandler::BreakItUp(const G4Fragment & theInitialState)
{       
  //G4cout << "@@@@@@@@@@ Start G4Excitation Handler @@@@@@@@@@@@@" << G4endl;
  // Variables existing until end of method
  G4Fragment * theInitialStatePtr = new G4Fragment(theInitialState);
  //G4cout << theInitialState << G4endl;  

  // pointer to fragment vector which receives temporal results
  G4FragmentVector * theTempResult = 0;     

  theResults.clear();
  thePhotoEvapList.clear();
  theEvapList.clear();
   
  // Variables to describe the excited configuration
  G4double exEnergy = theInitialState.GetExcitationEnergy();
  G4int A = theInitialState.GetA_asInt();
  G4int Z = theInitialState.GetZ_asInt();
  
  // In case A <= 1 the fragment will not perform any nucleon emission
  if (A <= 1) {
    theResults.push_back( theInitialStatePtr );

    // check if a fragment is stable
  } else if(exEnergy < minExcitation && nist->GetIsotopeAbundance(Z, A) > 0.0) {
    theResults.push_back( theInitialStatePtr );

    // JMQ 150909: first step in de-excitation is treated separately 
    // Fragments after the first step are stored in theEvapList 
  } else {      
    if((A<maxAForFermiBreakUp && Z<maxZForFermiBreakUp) 
       || exEnergy <= minEForMultiFrag*A) { 
      theEvapList.push_back(theInitialStatePtr); 

    // Statistical Multifragmentation will take place only once
    } else {
      theTempResult = theMultiFragmentation->BreakItUp(theInitialState);
      if(!theTempResult) { 
        theEvapList.push_back(theInitialStatePtr); 
      } else {
        size_t nsec = theTempResult->size();

        // no fragmentation
        if(0 == nsec) { 
          theEvapList.push_back(theInitialStatePtr); 

          // secondary are produced - sort out secondary fragments
        } else {
          G4bool deletePrimary = true;
          G4FragmentVector::iterator j;
          for (j = theTempResult->begin(); j != theTempResult->end(); ++j) {  
            if((*j) == theInitialStatePtr) { deletePrimary = false; }
            A = (*j)->GetA_asInt();  

            // gamma, p, n
            if(A <= 1) { 
              theResults.push_back(*j); 

              // Analyse fragment A > 1
            } else {
              G4double exEnergy1 = (*j)->GetExcitationEnergy();

              // cold fragments
              if(exEnergy1 < minExcitation) {
                Z = (*j)->GetZ_asInt(); 
                if(nist->GetIsotopeAbundance(Z, A) > 0.0) { 
                  theResults.push_back(*j); // stable fragment 
                } else {
                  theEvapList.push_back(*j);
                }
                // hot fragments are unstable
              } else { 
                theEvapList.push_back(*j); 
              } 
            }
          }
          if( deletePrimary ) { delete theInitialStatePtr; }
        }
        delete theTempResult; // end multifragmentation
      }
    }
  }
  /*
  G4cout << "## After first step " << theEvapList.size() << " for evap;  "
  << thePhotoEvapList.size() << " for photo-evap; " 
  << theResults.size() << " results. " << G4endl; 
  */
  // -----------------------------------
  // FermiBreakUp and De-excitation loop
  // -----------------------------------
      
  std::vector<G4Fragment*>::iterator iList;
  for (iList = theEvapList.begin(); iList != theEvapList.end(); ++iList) {
    //G4cout << "Next evaporate: " << G4endl;  
    //G4cout << *iList << G4endl;  
    G4Fragment* frag = *iList;
    A = frag->GetA_asInt(); 
    Z = frag->GetZ_asInt();
    results.clear();
          
    // Fermi Break-Up 
    if(A < maxAForFermiBreakUp && Z < maxZForFermiBreakUp && Z > 0 && A > Z) {
      G4double etot = frag->GetExcitationEnergy() + frag->GetGroundStateMass();
      if(thePool->IsApplicable(Z, A, etot)) {
        theFermiModel->BreakFragment(&results, frag);
        size_t nsec = results.size();
        //G4cout << "FermiBreakUp Nsec= " << nsec << G4endl;

        // FBU takes care to delete input fragment or add it to the results
        // results may be excited - photo-evaporation should be applied
        // If no final products then the fragment should be de-excited 
        // by evaporation
        if(0 < nsec) {
          for(size_t j=0; j<nsec; ++j) {
            exEnergy = results[j]->GetExcitationEnergy();
            if(exEnergy < minExcitation) { theResults.push_back(results[j]); }
            else                         { thePhotoEvapList.push_back(results[j]); }
          }
          continue; 
        }
      }
    }
    // apply Evaporation, residual nucleus is always added to the results
    theEvaporation->BreakFragment(&results, frag); 
    size_t nsec = results.size();
    //G4cout << "Evaporation Nsec= " << nsec << G4endl;
                  
    // no evaporation
    if(1 >= nsec) {
      theResults.push_back(frag);
      continue;
    }

    // Sort out secondary fragments
    for (size_t j = 0; j<nsec; ++j) {
      //G4cout << "Evaporated product #" << j << G4endl;
      //G4cout << results[j] << G4endl;  
      A = results[j]->GetA_asInt();
      //G4cout << "A= " << A << G4endl;
      if(A <= 1) { 
        theResults.push_back(results[j]);   // gamma, p, n
        continue;
      } 
      exEnergy = results[j]->GetExcitationEnergy();

      // hot fragment
      if(exEnergy >= minExcitation) {
        theEvapList.push_back(results[j]);        
            
        // cold fragment
      } else {  
        Z = results[j]->GetZ_asInt();

        // natural isotope
        if(nist->GetIsotopeAbundance(Z, A) > 0.0) { 
          theResults.push_back(results[j]); // stable fragment 

        } else {
          theEvapList.push_back(results[j]);      
        }
      }
    } // end of loop on secondary
  } // end of the loop over theEvapList
  /* 
  G4cout << "## After 2nd step " << theEvapList.size() << " was evap;  "
         << thePhotoEvapList.size() << " for photo-evap; " 
         << theResults.size() << " results. " << G4endl; 
  */
  // -----------------------
  // Photon-Evaporation loop
  // -----------------------
  
  // at this point only photon evaporation is possible
  for(iList = thePhotoEvapList.begin(); iList != thePhotoEvapList.end(); ++iList) {
    //G4cout << "Next photon evaporate: " << thePhotonEvaporation << G4endl;  
    //G4cout << *iList << G4endl;
    exEnergy = (*iList)->GetExcitationEnergy();

    // photon de-excitation only for hot fragments
    if(exEnergy > minExcitation) {  
      thePhotonEvaporation->BreakUpChain(&theResults, *iList);
    }

    // priamry fragment is kept
    theResults.push_back(*iList); 

  } // end of photon-evaporation loop
  /*
  G4cout << "## After 3d step " << theEvapList.size() << " was evap;  "
         << thePhotoEvapList.size() << " was photo-evap; " 
         << theResults.size() << " results. " << G4endl; 
  */
  G4ReactionProductVector * theReactionProductVector = 
    new G4ReactionProductVector();

  // MAC (24/07/08)
  // To optimise the storing speed, we reserve space in memory for the vector
  theReactionProductVector->reserve( theResults.size() );

  G4int theFragmentA, theFragmentZ;

  //G4cout << "### ExcitationHandler provides " << theResults.size() 
  //     << " evaporated products:" << G4endl;
  for (iList = theResults.begin(); iList != theResults.end(); ++iList) {
    //G4cout << (*iList) << G4endl;  

    theFragmentA = (*iList)->GetA_asInt();
    theFragmentZ = (*iList)->GetZ_asInt();
    G4double etot= (*iList)->GetMomentum().e();
    G4double eexc = 0.0;
    const G4ParticleDefinition* theKindOfFragment = 0;
    if (theFragmentA == 0) {       // photon or e-
      theKindOfFragment = (*iList)->GetParticleDefinition();   
    } else if (theFragmentA == 1 && theFragmentZ == 0) { // neutron
      theKindOfFragment = G4Neutron::NeutronDefinition();
    } else if (theFragmentA == 1 && theFragmentZ == 1) { // proton
      theKindOfFragment = G4Proton::ProtonDefinition();
    } else if (theFragmentA == 2 && theFragmentZ == 1) { // deuteron
      theKindOfFragment = G4Deuteron::DeuteronDefinition();
    } else if (theFragmentA == 3 && theFragmentZ == 1) { // triton
      theKindOfFragment = G4Triton::TritonDefinition();
    } else if (theFragmentA == 3 && theFragmentZ == 2) { // helium3
      theKindOfFragment = G4He3::He3Definition();
    } else if (theFragmentA == 4 && theFragmentZ == 2) { // alpha
      theKindOfFragment = G4Alpha::AlphaDefinition();;
    } else {

      // fragment
      eexc = (*iList)->GetExcitationEnergy();
      if(eexc < minExcitation) { eexc = 0.0; }
      theKindOfFragment = theTableOfIons->GetIon(theFragmentZ,theFragmentA,eexc);
      /*        
        G4cout << "### Find ion Z= " << theFragmentZ << " A= " << theFragmentA
               << " Eexc(MeV)= " << eexc/MeV << "  " << theKindOfFragment << G4endl;
      */
    }
    // fragment identified
    if(theKindOfFragment) {
      G4ReactionProduct * theNew = new G4ReactionProduct(theKindOfFragment);
      theNew->SetMomentum((*iList)->GetMomentum().vect());
      theNew->SetTotalEnergy(etot);
      theNew->SetFormationTime((*iList)->GetCreationTime());
      theReactionProductVector->push_back(theNew);

      // fragment not found out ground state is created
    } else { 
      theKindOfFragment = theTableOfIons->GetIon(theFragmentZ,theFragmentA,0.0);
      if(theKindOfFragment) {
        G4ThreeVector mom(0.0,0.0,0.0); 
        G4double ionmass = theKindOfFragment->GetPDGMass();
        if(etot <= ionmass) {
          etot = ionmass;
        } else {
          G4double ptot = std::sqrt((etot - ionmass)*(etot + ionmass));
          mom = ((*iList)->GetMomentum().vect().unit())*ptot;
        }
        G4ReactionProduct * theNew = new G4ReactionProduct(theKindOfFragment);
        theNew->SetMomentum(mom);
        theNew->SetTotalEnergy(etot);
        theNew->SetFormationTime((*iList)->GetCreationTime());
        theReactionProductVector->push_back(theNew);
        /*  
          G4cout << "### Find ion Z= " << theFragmentZ << " A= " << theFragmentA
          << " ground state, energy corrected  " << theKindOfFragment << G4endl;
        } else {
                G4cout << "### Find ion Z= " << theFragmentZ 
                << " A= " << theFragmentA << " failed  " << G4endl;
          */
      }
    }
    delete (*iList);
  }
  return theReactionProductVector;
}

void G4ExcitationHandler::SetParameters()
{
  //for inverse cross section choice
  theEvaporation->SetOPTxs(OPTxs);
  //for the choice of superimposed Coulomb Barrier for inverse cross sections
  theEvaporation->UseSICB(useSICB);
  theEvaporation->InitialiseChannels();
}

void G4ExcitationHandler::SetEvaporation(G4VEvaporation* ptr)
{
  if(ptr && ptr != theEvaporation) {
    delete theEvaporation; 
    theEvaporation = ptr;
    thePhotonEvaporation = ptr->GetPhotonEvaporation();
    SetParameters();
    isEvapLocal = false;
  }
}

void 
G4ExcitationHandler::SetMultiFragmentation(G4VMultiFragmentation* ptr)
{
  if(ptr && ptr != theMultiFragmentation) {
    delete theMultiFragmentation;
    theMultiFragmentation = ptr;
  }
}

void G4ExcitationHandler::SetFermiModel(G4VFermiBreakUp* ptr)
{
  if(ptr && ptr != theFermiModel) {
    delete theFermiModel;
    theFermiModel = ptr;
  }
}

void 
G4ExcitationHandler::SetPhotonEvaporation(G4VEvaporationChannel* ptr)
{
  if(ptr && ptr != thePhotonEvaporation) {
    thePhotonEvaporation = ptr;
    theEvaporation->SetPhotonEvaporation(ptr);
    ptr->Initialise();
  }
}

void G4ExcitationHandler::SetMaxZForFermiBreakUp(G4int aZ)
{
  maxZForFermiBreakUp = aZ;
}

void G4ExcitationHandler::SetMaxAForFermiBreakUp(G4int anA)
{
  maxAForFermiBreakUp = anA;
}

void G4ExcitationHandler::SetMaxAandZForFermiBreakUp(G4int anA, G4int aZ)
{
  SetMaxAForFermiBreakUp(anA);
  SetMaxZForFermiBreakUp(aZ);
}

void G4ExcitationHandler::SetMinEForMultiFrag(G4double anE)
{
  minEForMultiFrag = anE;
}
void G4ExcitationHandler::ModelDescription(std::ostream& outFile) const
{
    outFile << "G4ExcitationHandler description\n"
            << "This class samples de-excitation of excited nucleus using\n"
            << "Fermi Break-up model for light fragments (Z < 9, A < 17), "
            << "evaporation, fission, and photo-evaporation models. Evaporated\n"
            << "particle may be proton, neutron, and other light fragment \n"
            << "(Z < 13, A < 29). During photon evaporation produced gamma \n"
            << "or electrons due to internal conversion \n";
}