G4Evaporation Class Reference

#include <G4Evaporation.hh>

Inheritance diagram for G4Evaporation:

Collaboration diagram for G4Evaporation:

Public Member Functions
	G4Evaporation (G4VEvaporationChannel *photoEvaporation=nullptr)
virtual	~G4Evaporation ()
virtual void	InitialiseChannels () final
virtual void	BreakFragment (G4FragmentVector *, G4Fragment *theNucleus) final
void	SetDefaultChannel ()
void	SetGEMChannel ()
void	SetCombinedChannel ()
Public Member Functions inherited from G4VEvaporation
	G4VEvaporation ()
virtual	~G4VEvaporation ()
virtual void	SetPhotonEvaporation (G4VEvaporationChannel *ptr)
void	SetFermiBreakUp (G4VFermiBreakUp *ptr)
G4VFermiBreakUp *	GetFermiBreakUp () const
G4VEvaporationChannel *	GetPhotonEvaporation ()
G4VEvaporationChannel *	GetFissionChannel ()
void	SetOPTxs (G4int opt)
void	UseSICB (G4bool use)
size_t	GetNumberOfChannels () const

Additional Inherited Members
Protected Member Functions inherited from G4VEvaporation
void	CleanChannels ()
Protected Attributes inherited from G4VEvaporation
G4VEvaporationChannel *	thePhotonEvaporation
G4VFermiBreakUp *	theFBU
G4int	OPTxs
G4bool	useSICB
std::vector < G4VEvaporationChannel * > *	theChannels
G4VEvaporationFactory *	theChannelFactory

Detailed Description

Definition at line 61 of file G4Evaporation.hh.

Constructor & Destructor Documentation

G4Evaporation::G4Evaporation ( G4VEvaporationChannel *  photoEvaporation = nullptr )

explicit

Definition at line 66 of file G4Evaporation.cc.

  : G4VEvaporation(),fVerbose(0),nChannels(0),minExcitation(0.1*keV),
    isInitialised(false)
{
  if(photoEvaporation) { SetPhotonEvaporation(photoEvaporation); }
  else                 { SetPhotonEvaporation(new G4PhotonEvaporation()); }

  channelType = fEvaporation;
  theChannelFactory = new G4EvaporationFactory(thePhotonEvaporation);
  InitialiseChannelFactory();

  theTableOfIons = G4ParticleTable::GetParticleTable()->GetIonTable();
  nist = G4NistManager::Instance();
  unstableBreakUp = new G4UnstableFragmentBreakUp();
}

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G4Evaporation::~G4Evaporation ( )

virtual

Definition at line 82 of file G4Evaporation.cc.

{
  delete unstableBreakUp;
}

Member Function Documentation

void G4Evaporation::BreakFragment ( G4FragmentVector *  theResult, G4Fragment *  theNucleus  )

finalvirtual

Reimplemented from G4VEvaporation.

Definition at line 151 of file G4Evaporation.cc.

{
  if(!isInitialised) { InitialiseChannels(); }

  G4double totprob, prob, oldprob = 0.0;
  size_t maxchannel, i;

  G4int Amax = theResidualNucleus->GetA_asInt();

  // Starts loop over evaporated particles, loop is limited by number
  // of nucleons
  for(G4int ia=0; ia<Amax; ++ia) {
 
    // g,n,p and light fragments - evaporation is finished
    G4int Z = theResidualNucleus->GetZ_asInt();
    G4int A = theResidualNucleus->GetA_asInt();
    G4double Eex = theResidualNucleus->GetExcitationEnergy();

    // stop deecitation loop if residual can be deexcited by FBU    
    if(theFBU->IsApplicable(Z, A, Eex)) { break; }

    // check if it is stable, then finish evaporation
    G4double abun = nist->GetIsotopeAbundance(Z, A); 
    if(fVerbose > 0) {
      G4cout << "### G4Evaporation::BreakItUp step " << ia << " Z= " << Z
         << " A= " << A << " Eex(MeV)= " 
         << theResidualNucleus->GetExcitationEnergy()
         << " aban= " << abun << G4endl;
    }
    // stop deecitation loop in the case of a cold stable fragment 
    if(Eex <= minExcitation && abun > 0.0) { break; }
 
    totprob = 0.0;
    maxchannel = nChannels;
    if(fVerbose > 1) {
      G4cout << "### Evaporation loop #" << ia 
         << "  Fragment: " << theResidualNucleus << G4endl;
    }
    // loop over evaporation channels
    for(i=0; i<nChannels; ++i) {
      prob = (*theChannels)[i]->GetEmissionProbability(theResidualNucleus);
      if(fVerbose > 0 && prob > 0.0) {
    G4cout << "  Channel# " << i << "  prob= " << prob << G4endl; 
      }
      totprob += prob;
      probabilities[i] = totprob;

      // if two recent probabilities are near zero stop computations
      if(i>=8 && prob > 0.0) {
    if(prob <= totprob*1.e-8 && oldprob <= totprob*1.e-8) {
      maxchannel = i+1; 
      break;
    }
      }
      oldprob = prob;
    }

    // photon evaporation in the case of no other channels available
    // do evaporation chain and reset total probability
    if(0.0 < totprob && probabilities[0] == totprob) {
      if(fVerbose > 1) {
    G4cout << "Start chain of gamma evaporation" << G4endl;
      }
      (*theChannels)[0]->BreakUpChain(theResult, theResidualNucleus);
      totprob = 0.0;
    }

    // stable fragment - evaporation is finished
    if(0.0 == totprob) {

      // if fragment is exotic, then force its decay 
      if(0.0 == abun) {
    if(!unstableBreakUp->BreakUpChain(theResult, theResidualNucleus))
      { break; }
    if(fVerbose > 1) { G4cout << "$$$ Decay exotic fragment" << G4endl; }
      } else {
    break;
      }
    }

    // select channel
    totprob *= G4UniformRand();
    // loop over evaporation channels
    for(i=0; i<maxchannel; ++i) { if(probabilities[i] >= totprob) { break; } }

    if(fVerbose > 1) { G4cout << "Channel # " << i << G4endl; }
    G4Fragment* frag = (*theChannels)[i]->EmittedFragment(theResidualNucleus);
    if(fVerbose > 1 && frag) { G4cout << "   " << *frag << G4endl; }

    // normaly a fragment should be created
    if(frag) { theResult->push_back(frag); }
    else     { break; }
  }
  // loop is stopped, residual fragment is added to the results
  theResult->push_back(theResidualNucleus);
}

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void G4Evaporation::InitialiseChannels ( )

finalvirtual

Reimplemented from G4VEvaporation.

Definition at line 87 of file G4Evaporation.cc.

{
  if(isInitialised) { return; }

  G4DeexPrecoParameters* param = 
    G4NuclearLevelData::GetInstance()->GetParameters(); 
  minExcitation = param->GetMinExcitation();

  G4DeexChannelType type = param->GetDeexChannelsType();
  if(type == fCombined) { SetCombinedChannel(); }
  else if(type == fGEM) { SetGEMChannel(); }

  isInitialised = true;
}

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void G4Evaporation::SetCombinedChannel

(

)

Definition at line 140 of file G4Evaporation.cc.

{
  if(fCombined != channelType) {
    channelType = fCombined;
    CleanChannels();
    delete theChannelFactory;
    theChannelFactory = new G4EvaporationDefaultGEMFactory(thePhotonEvaporation);
    InitialiseChannelFactory();
  }
}

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void G4Evaporation::SetDefaultChannel

(

)

Definition at line 118 of file G4Evaporation.cc.

{
  if(fEvaporation != channelType) {
    channelType = fEvaporation;
    CleanChannels();
    delete theChannelFactory;
    theChannelFactory = new G4EvaporationFactory(thePhotonEvaporation);
    InitialiseChannelFactory();
  }
}

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void G4Evaporation::SetGEMChannel

(

)

Definition at line 129 of file G4Evaporation.cc.

{
  if(fGEM != channelType) {
    channelType = fCombined;
    CleanChannels();
    delete theChannelFactory;
    theChannelFactory = new G4EvaporationGEMFactory(thePhotonEvaporation);
    InitialiseChannelFactory();
  }
}

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---

The documentation for this class was generated from the following files:

• source/geant4.10.03.p03/source/processes/hadronic/models/de_excitation/evaporation/include/G4Evaporation.hh
• source/geant4.10.03.p03/source/processes/hadronic/models/de_excitation/evaporation/src/G4Evaporation.cc