G4Evaporation Class Reference

#include <G4Evaporation.hh>

Inheritance 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	SetGEMVIChannel ()
void	SetCombinedChannel ()
Public Member Functions inherited from G4VEvaporation
	G4VEvaporation ()
virtual	~G4VEvaporation ()
virtual void	BreakFragment (G4FragmentVector *, G4Fragment *theNucleus)
virtual void	InitialiseChannels ()
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::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 = fDummy;
  theChannelFactory = nullptr;
 
  fLevelData = G4NuclearLevelData::GetInstance();
  theTableOfIons = G4ParticleTable::GetParticleTable()->GetIonTable();
  nist = G4NistManager::Instance();
  unstableBreakUp = new G4UnstableFragmentBreakUp();
  /*
    G4cout << "G4Evaporation() " << this << " thePhotonEvaporation: "
       << photoEvaporation << "  UnstableFragmentBreakUp: " 
           << unstableBreakUp << G4endl;
  */
}

~G4Evaporation()

G4Evaporation::~G4Evaporation ( )

virtual

Definition at line 87 of file G4Evaporation.cc.

{
  delete unstableBreakUp;
}

Member Function Documentation

BreakFragment()

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

finalvirtual

Reimplemented from G4VEvaporation.

Definition at line 179 of file G4Evaporation.cc.

{
  if(!isInitialised) { InitialiseChannels(); }
 
  G4double totprob, prob, oldprob = 0.0;
  size_t maxchannel, i;
 
  G4int Amax = theResidualNucleus->GetA_asInt();
  if(fVerbose > 1) {
    G4cout << "### G4Evaporation::BreakItUp loop" << G4endl;
  }
 
  // 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();
    if(A <= 1) { break; }
    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); 
    // stop deecitation loop in the case of a cold stable fragment 
    if(Eex <= minExcitation && 
       (abun > 0.0 || (A == 3 && (Z == 1 || Z == 2)))) { break; }
 
    totprob = 0.0;
    maxchannel = nChannels;
    if(fVerbose > 1) {
      G4cout << "Evaporation# " << ia << " Z= " << Z << " A= " << A 
             << " Eex(MeV)= " << theResidualNucleus->GetExcitationEnergy()
         << " aban= " << abun << G4endl;
    }
    // loop over evaporation channels
    for(i=0; i<nChannels; ++i) {
      prob = (*theChannels)[i]->GetEmissionProbability(theResidualNucleus);
      if(fVerbose > 2 && 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 return back ground state fragment
    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) {
 
      // release fragment known to DB
      if(fLevelData->GetLevelManager(Z, A)) { break; }
 
      // if fragment is exotic, then it forced to decay 
      // if success, then decay product is added to results 
      if(fVerbose > 1) { 
    G4cout << "$$$ Decay exotic fragment" << G4endl; 
      }
      if(unstableBreakUp->BreakUpChain(theResult, theResidualNucleus)) {
        continue;
      }
      // release if it is not possible to decay
      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 > 2 && frag) { G4cout << "   " << *frag << G4endl; }
 
    // normaly a fragment should be created
    if(frag) { theResult->push_back(frag); }
    else     { break; }
  }
}

InitialiseChannels()

void G4Evaporation::InitialiseChannels ( )

finalvirtual

Reimplemented from G4VEvaporation.

Definition at line 92 of file G4Evaporation.cc.

{
  if(isInitialised) { return; }
 
  G4DeexPrecoParameters* param = fLevelData->GetParameters(); 
  minExcitation = param->GetMinExcitation();
  fVerbose = param->GetVerbose();
  unstableBreakUp->SetVerbose(fVerbose);
 
  G4DeexChannelType type = param->GetDeexChannelsType();
  if(type == fCombined) { SetCombinedChannel(); }
  else if(type == fGEM) { SetGEMChannel(); }
  else if(type == fEvaporation) { SetDefaultChannel(); }
  else if(type == fGEMVI) { SetGEMVIChannel(); }
 
  isInitialised = true;
}

Referenced by BreakFragment(), and G4ExcitationHandler::SetDeexChannelsType().

SetCombinedChannel()

void G4Evaporation::SetCombinedChannel

(

)

Definition at line 165 of file G4Evaporation.cc.

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

Referenced by InitialiseChannels(), and G4ExcitationHandler::SetDeexChannelsType().

SetDefaultChannel()

void G4Evaporation::SetDefaultChannel

(

)

Definition at line 126 of file G4Evaporation.cc.

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

Referenced by InitialiseChannels(), and G4ExcitationHandler::SetDeexChannelsType().

SetGEMChannel()

void G4Evaporation::SetGEMChannel

(

)

Definition at line 139 of file G4Evaporation.cc.

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

Referenced by InitialiseChannels(), and G4ExcitationHandler::SetDeexChannelsType().

SetGEMVIChannel()

void G4Evaporation::SetGEMVIChannel

(

)

Definition at line 152 of file G4Evaporation.cc.

{
  if(fGEMVI != channelType) {
    channelType = fGEMVI;
    if(theChannelFactory) {
      CleanChannels();
      delete theChannelFactory;
    }
    theChannelFactory = new G4EvaporationGEMFactoryVI(thePhotonEvaporation);
    InitialiseChannelFactory();
  }
}

Referenced by InitialiseChannels(), and G4ExcitationHandler::SetDeexChannelsType().

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

• G4Evaporation.hh
• G4Evaporation.cc