G4VGammaDeexcitation Class Reference

#include <G4VGammaDeexcitation.hh>

Inheritance diagram for G4VGammaDeexcitation:

Collaboration diagram for G4VGammaDeexcitation:

Public Member Functions
	G4VGammaDeexcitation ()
virtual	~G4VGammaDeexcitation ()
virtual G4bool	CanDoTransition (G4Fragment *aNucleus)=0
void	DoChain (G4FragmentVector *, G4Fragment *nucleus)
G4Fragment *	GenerateGamma (G4Fragment *nucleus)
void	SetVerboseLevel (G4int verbose)
void	SetEO (G4ElectronOccupancy eo)
void	SetVaccantSN (G4int val)
G4ElectronOccupancy	GetEO ()
G4int	GetVacantSN ()
void	SetTimeLimit (G4double value)

Protected Attributes
G4VGammaTransition *	_transition
G4int	_verbose
G4double	_tolerance
G4double	_timeLimit

Private Member Functions
	G4VGammaDeexcitation (const G4VGammaDeexcitation &right)
const G4VGammaDeexcitation &	operator= (const G4VGammaDeexcitation &right)
G4bool	operator== (const G4VGammaDeexcitation &right) const
G4bool	operator!= (const G4VGammaDeexcitation &right) const

Private Attributes
G4ElectronOccupancy	_electronO
G4int	_vSN

Detailed Description

Definition at line 72 of file G4VGammaDeexcitation.hh.

Constructor & Destructor Documentation

G4VGammaDeexcitation() [1/2]

G4VGammaDeexcitation::G4VGammaDeexcitation

(

)

Definition at line 76 of file G4VGammaDeexcitation.cc.

                                          : _transition(0), _verbose(0),
                          _electronO (0), _vSN(-1)
{ 
  _tolerance = 0.1*CLHEP::keV;
  _timeLimit = DBL_MAX;
}

~G4VGammaDeexcitation()

G4VGammaDeexcitation::~G4VGammaDeexcitation ( )

virtual

Definition at line 83 of file G4VGammaDeexcitation.cc.

{ 
  delete _transition; 
}

G4VGammaDeexcitation() [2/2]

G4VGammaDeexcitation::G4VGammaDeexcitation ( const G4VGammaDeexcitation &  right )

private

Member Function Documentation

CanDoTransition()

virtual G4bool G4VGammaDeexcitation::CanDoTransition ( G4Fragment *  aNucleus )

pure virtual

Implemented in G4DiscreteGammaDeexcitation, and G4ContinuumGammaDeexcitation.

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DoChain()

void G4VGammaDeexcitation::DoChain	(	G4FragmentVector *	products,
		G4Fragment *	nucleus
	)

Definition at line 88 of file G4VGammaDeexcitation.cc.

{
  if (_verbose > 1) { G4cout << "G4VGammaDeexcitation::DoChain" << G4endl; }
  
  if(CanDoTransition(nucleus)) { 
    for(size_t i=0; i<100; ++i) {      
      _transition->SetEnergyFrom(nucleus->GetExcitationEnergy());
      G4Fragment* gamma = GenerateGamma(nucleus);
      if (gamma) { products->push_back(gamma); }
      else { break; } 
      //G4cout << i << ".  Egamma(MeV)= " << gamma->GetMomentum().e() 
      //         << "; new Eex(MeV)= " << nucleus->GetExcitationEnergy() 
      //       << G4endl;
      if(nucleus->GetExcitationEnergy() <= _tolerance) { break; }
    } 
  }
  if (_verbose > 1) {
    G4cout << "G4VGammaDeexcitation::DoChain - end" << G4endl;
  }
}

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GenerateGamma()

G4Fragment * G4VGammaDeexcitation::GenerateGamma

(

G4Fragment *

nucleus

)

Definition at line 110 of file G4VGammaDeexcitation.cc.

{
  G4Fragment * thePhoton = 0;
  _vSN = -1;

  _transition->SelectGamma();  // it can be conversion electron too

  G4double etrans = _transition->GetGammaEnergy();

  //L.Desorgher 05/01/2015 need to add the bond energy for correct 
  //                       computation of a transition in case of ICM
  G4DiscreteGammaTransition* dtransition =
     dynamic_cast <G4DiscreteGammaTransition*> (_transition);
  G4double bond_energy=0.;

  if (dtransition && !dtransition->IsAGamma()) { 
    bond_energy = dtransition->GetBondEnergy(); 
  }
  etrans += bond_energy;
  //G4cout << "G4VGammaDeexcitation::GenerateGamma - Etrans(MeV)= " 
  //     << etrans << G4endl; 
  if(etrans <= 0.0) { return thePhoton; }

  // final excitation
  G4double excitation = aNucleus->GetExcitationEnergy() - etrans;
  if(excitation <= _tolerance) { excitation = 0.0; } 

  G4double gammaTime = _transition->GetGammaCreationTime();
  if (_verbose > 1) {
    G4cout << "G4VGammaDeexcitation::GenerateGamma - Edeexc(MeV)= " 
           << etrans << "; Time(ns)= " << gammaTime/CLHEP::ns 
       << "; left Eexc(MeV)= " << excitation << G4endl;
  }
  
  // Do complete Lorentz computation 
  G4LorentzVector lv = aNucleus->GetMomentum();
  G4double Mass = aNucleus->GetGroundStateMass() + excitation;

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

  if (dtransition && !dtransition->IsAGamma() ) {
    gamma = G4Electron::Electron(); 
    _vSN = dtransition->GetOrbitNumber();   
    _electronO.RemoveElectron(_vSN);
    //L. Desorgher 05/01/2015 need to remove atomic bond energy 
    //                        of the IC electron
    lv += G4LorentzVector(0.0,0.0,0.0,
                          CLHEP::electron_mass_c2 - bond_energy);
  }

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

  G4double eMass = gamma->GetPDGMass();
  G4LorentzVector Gamma4P;
  /*
  G4cout << " Mass= " << eMass << " t= " << gammaTime
     << " tlim= " << _timeLimit << G4endl;
  */
  // 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) { GammaEnergy = eMass; }

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

  // Lab system in normal case (_timeLimit = DBL_MAX)
  if(gammaTime <= _timeLimit) { 
    Gamma4P.boost(bst); 
    lv -= Gamma4P;
  } else {  
    // In exceptional case sample decay at rest at not correct position 
    // of stopping ion, 4-momentum balance is breaked but gamma energy
    // is correct
    lv -= Gamma4P;
    G4double E = lv.e();
    G4double P2= (E - Mass)*(E + Mass);
    G4ThreeVector v = lv.vect().unit();
    G4double p = 0.0;
    if(P2 > 0.0) { p = std::sqrt(P2); } 
    else { E = Mass; }
    lv.set(v.x()*p, v.y()*p, v.z()*p, E);  
  }

  // modified primary fragment 
  gammaTime += aNucleus->GetCreationTime();
  aNucleus->SetMomentum(lv);
  aNucleus->SetCreationTime(gammaTime);

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

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

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GetEO()

G4ElectronOccupancy G4VGammaDeexcitation::GetEO ( )

inline

Definition at line 94 of file G4VGammaDeexcitation.hh.

{ return _electronO; };    

GetVacantSN()

G4int G4VGammaDeexcitation::GetVacantSN ( )

inline

Definition at line 95 of file G4VGammaDeexcitation.hh.

{ return _vSN;};

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operator!=()

G4bool G4VGammaDeexcitation::operator!= ( const G4VGammaDeexcitation &  right ) const

private

operator=()

const G4VGammaDeexcitation& G4VGammaDeexcitation::operator= ( const G4VGammaDeexcitation &  right )

private

operator==()

G4bool G4VGammaDeexcitation::operator== ( const G4VGammaDeexcitation &  right ) const

private

SetEO()

void G4VGammaDeexcitation::SetEO ( G4ElectronOccupancy  eo )

inline

Definition at line 91 of file G4VGammaDeexcitation.hh.

{ _electronO = eo; };

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SetTimeLimit()

void G4VGammaDeexcitation::SetTimeLimit ( G4double  value )

inline

Definition at line 97 of file G4VGammaDeexcitation.hh.

{ _timeLimit = value; }

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SetVaccantSN()

void G4VGammaDeexcitation::SetVaccantSN ( G4int  val )

inline

Definition at line 92 of file G4VGammaDeexcitation.hh.

{ _vSN = val;};

SetVerboseLevel()

void G4VGammaDeexcitation::SetVerboseLevel ( G4int  verbose )

inline

Definition at line 87 of file G4VGammaDeexcitation.hh.

{ _verbose = verbose; };

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Member Data Documentation

_electronO

G4ElectronOccupancy G4VGammaDeexcitation::_electronO

private

Definition at line 113 of file G4VGammaDeexcitation.hh.

_timeLimit

G4double G4VGammaDeexcitation::_timeLimit

protected

Definition at line 104 of file G4VGammaDeexcitation.hh.

_tolerance

G4double G4VGammaDeexcitation::_tolerance

protected

Definition at line 103 of file G4VGammaDeexcitation.hh.

_transition

G4VGammaTransition* G4VGammaDeexcitation::_transition

protected

Definition at line 101 of file G4VGammaDeexcitation.hh.

_verbose

G4int G4VGammaDeexcitation::_verbose

protected

Definition at line 102 of file G4VGammaDeexcitation.hh.

_vSN

G4int G4VGammaDeexcitation::_vSN

private

Definition at line 114 of file G4VGammaDeexcitation.hh.

---

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

• G4VGammaDeexcitation.hh
• G4VGammaDeexcitation.cc