G4VGammaDeexcitation Class Reference

#include <G4VGammaDeexcitation.hh>

Inheritance diagram for G4VGammaDeexcitation:

Public Member Functions
	G4VGammaDeexcitation ()
virtual	~G4VGammaDeexcitation ()
virtual G4VGammaTransition *	CreateTransition ()=0
virtual G4bool	CanDoTransition ()=0
G4FragmentVector *	DoTransition ()
G4FragmentVector *	DoChain ()
G4Fragment *	GenerateGamma ()
G4Fragment *	GetNucleus ()
void	SetNucleus (G4Fragment *nucleus)
void	SetVerboseLevel (G4int verbose)
void	Initialize ()
void	SetEO (G4ElectronOccupancy eo)
void	SetVaccantSN (G4int val)
G4ElectronOccupancy	GetEO ()
G4int	GetVacantSN ()
void	SetTimeLimit (G4double value)
Protected Member Functions
void	Update ()
Protected Attributes
G4VGammaTransition *	_transition
G4int	_verbose

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Detailed Description

Definition at line 72 of file G4VGammaDeexcitation.hh.

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Constructor & Destructor Documentation

G4VGammaDeexcitation::G4VGammaDeexcitation

(

)

Definition at line 76 of file G4VGammaDeexcitation.cc.

References DBL_MAX.

                                          : _transition(0), _verbose(0),
                                              _electronO (0), _vSN(-1)
{ 
  _nucleus = 0;
  fTimeLimit = DBL_MAX;
}

G4VGammaDeexcitation::~G4VGammaDeexcitation

(

)

[virtual]

Definition at line 83 of file G4VGammaDeexcitation.cc.

References _transition.

{ 
  if (_transition != 0) { delete _transition; }
}

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Member Function Documentation

virtual G4bool G4VGammaDeexcitation::CanDoTransition

(

)

[pure virtual]

Implemented in G4ContinuumGammaDeexcitation, and G4DiscreteGammaDeexcitation.

Referenced by DoChain(), DoTransition(), and G4PhotonEvaporation::EmittedFragment().

virtual G4VGammaTransition* G4VGammaDeexcitation::CreateTransition

(

)

[pure virtual]

Implemented in G4ContinuumGammaDeexcitation, and G4DiscreteGammaDeexcitation.

Referenced by Initialize(), and Update().

G4FragmentVector * G4VGammaDeexcitation::DoChain

(

)

Definition at line 106 of file G4VGammaDeexcitation.cc.

References _transition, _verbose, CanDoTransition(), G4cout, G4endl, GenerateGamma(), G4Fragment::GetExcitationEnergy(), Initialize(), G4VGammaTransition::SetEnergyFrom(), and Update().

Referenced by G4PhotonEvaporation::BreakItUp(), and G4PhotonEvaporation::BreakUpFragment().

{
  if (_verbose > 1) { G4cout << "G4VGammaDeexcitation::DoChain" << G4endl; }
  const G4double tolerance = CLHEP::keV;

  Initialize();
  G4FragmentVector* products = new G4FragmentVector();
  
  while (CanDoTransition())
    {      
      _transition->SetEnergyFrom(_nucleus->GetExcitationEnergy());
      G4Fragment* gamma = GenerateGamma();
      if (gamma != 0) 
        {
          products->push_back(gamma);
          //G4cout << "Eex(keV)= " << _nucleus->GetExcitationEnergy()/keV << G4endl;
          if(_nucleus->GetExcitationEnergy() <= tolerance) { break; }
          Update();
        }
    } 
  
  if (_verbose > 1) {
    G4cout << "G4VGammaDeexcitation::DoChain - Transition deleted, end of chain " << G4endl;
  }
  
  return products;
}

G4FragmentVector * G4VGammaDeexcitation::DoTransition

(

)

Definition at line 88 of file G4VGammaDeexcitation.cc.

References _verbose, CanDoTransition(), G4cout, G4endl, GenerateGamma(), and Initialize().

Referenced by G4PhotonEvaporation::BreakUp().

{
  Initialize();
  G4FragmentVector* products = new G4FragmentVector();
 
  if (CanDoTransition())
    {
      G4Fragment* gamma = GenerateGamma();
      if (gamma != 0) { products->push_back(gamma); }
    }
 
  if (_verbose > 1) {
    G4cout << "G4VGammaDeexcitation::DoTransition - Transition deleted " << G4endl;
  }
 
  return products;
}

G4Fragment * G4VGammaDeexcitation::GenerateGamma

(

)

Definition at line 134 of file G4VGammaDeexcitation.cc.

References _transition, _verbose, G4Electron::Electron(), G4cout, G4endl, G4UniformRand, G4Gamma::Gamma(), G4DiscreteGammaTransition::GetBondEnergy(), G4Fragment::GetCreationTime(), G4Fragment::GetExcitationEnergy(), G4VGammaTransition::GetGammaCreationTime(), G4VGammaTransition::GetGammaEnergy(), G4Fragment::GetGroundStateMass(), G4DiscreteGammaTransition::GetICM(), G4Fragment::GetMomentum(), G4DiscreteGammaTransition::GetOrbitNumber(), G4ParticleDefinition::GetPDGMass(), G4DiscreteGammaTransition::IsAGamma(), G4ElectronOccupancy::RemoveElectron(), G4VGammaTransition::SelectGamma(), G4Fragment::SetCreationTime(), and G4Fragment::SetMomentum().

Referenced by DoChain(), DoTransition(), and G4PhotonEvaporation::EmittedFragment().

{
  // 23/04/10 V.Ivanchenko rewrite complitely
  G4double eGamma = 0.;
  
  if (_transition) {
    _transition->SelectGamma();  // it can be conversion electron too
    eGamma = _transition->GetGammaEnergy(); 
    //G4cout << "G4VGammaDeexcitation::GenerateGamma - Egam(MeV)= " 
    //     << eGamma << G4endl; 
    if(eGamma <= 0.0) { return 0; }
  } else { return 0; }

  G4double excitation = _nucleus->GetExcitationEnergy() - eGamma;
  if(excitation < 0.0) { excitation = 0.0; } 
  if (_verbose > 1) 
    {
      G4cout << "G4VGammaDeexcitation::GenerateGamma - Edeexc(MeV)= " << eGamma 
             << " ** left Eexc(MeV)= " << excitation
             << G4endl;
    }

  G4double gammaTime = _transition->GetGammaCreationTime();
  
  // Do complete Lorentz computation 
  G4LorentzVector lv = _nucleus->GetMomentum();
  G4double Mass = _nucleus->GetGroundStateMass() + excitation;

  // select secondary
  G4ParticleDefinition* gamma = G4Gamma::Gamma();

  G4DiscreteGammaTransition* dtransition = 
    dynamic_cast <G4DiscreteGammaTransition*> (_transition);

  G4bool eTransition = false;
  if (dtransition && !( dtransition->IsAGamma()) ) {
    eTransition = true; 
    gamma = G4Electron::Electron(); 
    _vSN = dtransition->GetOrbitNumber();   
    _electronO.RemoveElectron(_vSN);
    lv += G4LorentzVector(0.0,0.0,0.0,CLHEP::electron_mass_c2 - dtransition->GetBondEnergy());
  }

  G4double cosTheta = 1. - 2. * G4UniformRand(); 
  G4double sinTheta = std::sqrt(1. - cosTheta * cosTheta);
  G4double phi = twopi * G4UniformRand();

  G4double eMass = gamma->GetPDGMass();
  G4LorentzVector Gamma4P;

  //G4cout << "Egamma= " << eGamma << " Mass= " << eMass << " t= " << gammaTime
  //     << " tlim= " << fTimeLimit << G4endl;

  if(gammaTime > fTimeLimit) {
    // shortcut for long lived levels
    // not correct position of stopping ion gamma emission
    // 4-momentum balance is breaked
    G4double e = eGamma + eMass;
    G4double mom = std::sqrt(eGamma*(eGamma + 2*eMass));
    Gamma4P.set(mom * sinTheta * std::cos(phi),
                mom * sinTheta * std::sin(phi),
                mom * cosTheta, e); 
    lv -= Gamma4P;
    e = lv.e();
    if(e < Mass) { e = Mass; }
    mom = std::sqrt((e - Mass)*(e + Mass));
    G4ThreeVector v = lv.vect().unit();
    lv.set(mom*v.x(), mom*v.y(), mom*v.z(), e); 

  } else {
    // 2-body decay in rest frame
    G4double Ecm       = lv.mag();
    G4ThreeVector bst  = lv.boostVector();

    G4double GammaEnergy = 0.5*((Ecm - Mass)*(Ecm + Mass) + eMass*eMass)/Ecm;
    if(GammaEnergy <= eMass) { return 0; }

    G4double mom = std::sqrt((GammaEnergy - eMass)*(GammaEnergy + eMass));
    Gamma4P.set(mom * sinTheta * std::cos(phi),
                mom * sinTheta * std::sin(phi),
                mom * cosTheta,
                GammaEnergy);

    Gamma4P.boost(bst);  
    lv -= Gamma4P;
  }

  // modified primary fragment 
  gammaTime += _nucleus->GetCreationTime();

  _nucleus->SetMomentum(lv);
  _nucleus->SetCreationTime(gammaTime);

  // e- is not produced
  if(eTransition && !dtransition->GetICM()) { return 0; }

  // gamma or e- are produced
  G4Fragment * thePhoton = new G4Fragment(Gamma4P,gamma);
  thePhoton->SetCreationTime(gammaTime);

  //G4cout << "G4VGammaDeexcitation::GenerateGamma : " << thePhoton << G4endl;
  //G4cout << "       Left nucleus: " << _nucleus << G4endl;
  return thePhoton;
}

G4ElectronOccupancy G4VGammaDeexcitation::GetEO

(

)

[inline]

Definition at line 102 of file G4VGammaDeexcitation.hh.

Referenced by G4PhotonEvaporation::BreakItUp(), G4PhotonEvaporation::BreakUp(), and G4PhotonEvaporation::BreakUpFragment().

{ return _electronO; };    

G4Fragment * G4VGammaDeexcitation::GetNucleus

(

)

[inline]

Definition at line 128 of file G4VGammaDeexcitation.hh.

Referenced by G4DiscreteGammaDeexcitation::CanDoTransition(), G4ContinuumGammaDeexcitation::CanDoTransition(), G4DiscreteGammaDeexcitation::CreateTransition(), and G4ContinuumGammaDeexcitation::CreateTransition().

{
  return _nucleus; 
}

G4int G4VGammaDeexcitation::GetVacantSN

(

)

[inline]

Definition at line 103 of file G4VGammaDeexcitation.hh.

Referenced by G4PhotonEvaporation::BreakItUp(), G4PhotonEvaporation::BreakUp(), and G4PhotonEvaporation::BreakUpFragment().

{return _vSN;};

void G4VGammaDeexcitation::Initialize

(

)

[inline]

Definition at line 143 of file G4VGammaDeexcitation.hh.

References _transition, CreateTransition(), G4Fragment::GetExcitationEnergy(), and G4VGammaTransition::SetEnergyFrom().

Referenced by DoChain(), DoTransition(), and G4PhotonEvaporation::EmittedFragment().

{
  if (_transition != 0) { delete _transition; }
  _transition = CreateTransition();
  if (_transition != 0) {
    _transition->SetEnergyFrom(_nucleus->GetExcitationEnergy());
  }
}

void G4VGammaDeexcitation::SetEO

(

G4ElectronOccupancy

eo

)

[inline]

Definition at line 99 of file G4VGammaDeexcitation.hh.

Referenced by G4PhotonEvaporation::SetEOccupancy().

{ _electronO = eo; };

void G4VGammaDeexcitation::SetNucleus

(

G4Fragment *

nucleus

)

[inline]

Definition at line 133 of file G4VGammaDeexcitation.hh.

Referenced by G4PhotonEvaporation::BreakItUp(), G4PhotonEvaporation::BreakUp(), G4PhotonEvaporation::BreakUpFragment(), and G4PhotonEvaporation::EmittedFragment().

{
  _nucleus = nucleus;
}

void G4VGammaDeexcitation::SetTimeLimit

(

G4double

value

)

[inline]

Definition at line 105 of file G4VGammaDeexcitation.hh.

Referenced by G4PhotonEvaporation::G4PhotonEvaporation(), and G4PhotonEvaporation::SetTimeLimit().

{ fTimeLimit = value; }

void G4VGammaDeexcitation::SetVaccantSN

(

G4int

val

)

[inline]

Definition at line 100 of file G4VGammaDeexcitation.hh.

Referenced by G4PhotonEvaporation::BreakItUp(), G4PhotonEvaporation::BreakUp(), and G4PhotonEvaporation::BreakUpFragment().

{ _vSN = val;};

void G4VGammaDeexcitation::SetVerboseLevel

(

G4int

verbose

)

[inline]

Definition at line 138 of file G4VGammaDeexcitation.hh.

References _verbose.

Referenced by G4PhotonEvaporation::SetVerboseLevel().

{
  _verbose = verbose;
}

void G4VGammaDeexcitation::Update

(

)

[protected]

Definition at line 239 of file G4VGammaDeexcitation.cc.

References _transition, _verbose, CreateTransition(), G4cout, G4endl, G4Fragment::GetExcitationEnergy(), and G4VGammaTransition::SetEnergyFrom().

Referenced by DoChain().

{
  if (_transition !=  0) 
    { 
      delete _transition;
      _transition = 0;
      if (_verbose > 1) {
        G4cout << "G4VGammaDeexcitation::Update - Transition deleted " << G4endl;
      }
    }
  
  _transition = CreateTransition();
  if (_transition != 0) 
    {
      _transition->SetEnergyFrom(_nucleus->GetExcitationEnergy());
      // if ( _vSN != -1) (dynamic_cast <G4DiscreteGammaTransition*> (_transition))->SetICM(false);
      // the above line is commented out for bug fix #952. It was intruduced for reason that
      // the k-shell electron is most likely one to be kicked out and there is no time for 
      // the atom to deexcite before the next IC. But this limitation is causing other problems as 
      // reported in #952
    }
  
  return;
}

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Field Documentation

G4VGammaTransition* G4VGammaDeexcitation::_transition [protected]

Definition at line 111 of file G4VGammaDeexcitation.hh.

Referenced by G4DiscreteGammaDeexcitation::CanDoTransition(), G4ContinuumGammaDeexcitation::CanDoTransition(), DoChain(), GenerateGamma(), Initialize(), Update(), and ~G4VGammaDeexcitation().

G4int G4VGammaDeexcitation::_verbose [protected]

Definition at line 112 of file G4VGammaDeexcitation.hh.

Referenced by G4DiscreteGammaDeexcitation::CanDoTransition(), G4ContinuumGammaDeexcitation::CanDoTransition(), G4DiscreteGammaDeexcitation::CreateTransition(), G4ContinuumGammaDeexcitation::CreateTransition(), DoChain(), DoTransition(), GenerateGamma(), SetVerboseLevel(), and Update().

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

• G4VGammaDeexcitation.hh
• G4VGammaDeexcitation.cc

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