Geant4 9.6.0
Toolkit for the simulation of the passage of particles through matter
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Public Member Functions | Protected Attributes | List of all members
G4PenelopeAnnihilationModel Class Reference

#include <G4PenelopeAnnihilationModel.hh>

+ Inheritance diagram for G4PenelopeAnnihilationModel:

Public Member Functions

 G4PenelopeAnnihilationModel (const G4ParticleDefinition *p=0, const G4String &processName="PenAnnih")
 
virtual ~G4PenelopeAnnihilationModel ()
 
virtual void Initialise (const G4ParticleDefinition *, const G4DataVector &)
 
virtual G4double ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kinEnergy, G4double Z, G4double A=0, G4double cut=0, G4double emax=DBL_MAX)
 
virtual void SampleSecondaries (std::vector< G4DynamicParticle * > *, const G4MaterialCutsCouple *, const G4DynamicParticle *, G4double tmin, G4double maxEnergy)
 
void SetVerbosityLevel (G4int lev)
 
G4int GetVerbosityLevel ()
 
- Public Member Functions inherited from G4VEmModel
 G4VEmModel (const G4String &nam)
 
virtual ~G4VEmModel ()
 
virtual void Initialise (const G4ParticleDefinition *, const G4DataVector &)=0
 
virtual void SampleSecondaries (std::vector< G4DynamicParticle * > *, const G4MaterialCutsCouple *, const G4DynamicParticle *, G4double tmin=0.0, G4double tmax=DBL_MAX)=0
 
virtual G4double ComputeDEDXPerVolume (const G4Material *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=DBL_MAX)
 
virtual G4double CrossSectionPerVolume (const G4Material *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
 
virtual G4double ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kinEnergy, G4double Z, G4double A=0., G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
 
virtual G4double ChargeSquareRatio (const G4Track &)
 
virtual G4double GetChargeSquareRatio (const G4ParticleDefinition *, const G4Material *, G4double kineticEnergy)
 
virtual G4double GetParticleCharge (const G4ParticleDefinition *, const G4Material *, G4double kineticEnergy)
 
virtual void StartTracking (G4Track *)
 
virtual void CorrectionsAlongStep (const G4MaterialCutsCouple *, const G4DynamicParticle *, G4double &eloss, G4double &niel, G4double length)
 
virtual G4double Value (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy)
 
virtual G4double MinPrimaryEnergy (const G4Material *, const G4ParticleDefinition *)
 
virtual void SetupForMaterial (const G4ParticleDefinition *, const G4Material *, G4double kineticEnergy)
 
virtual void DefineForRegion (const G4Region *)
 
void InitialiseElementSelectors (const G4ParticleDefinition *, const G4DataVector &)
 
G4double ComputeDEDX (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=DBL_MAX)
 
G4double CrossSection (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
 
G4double ComputeMeanFreePath (const G4ParticleDefinition *, G4double kineticEnergy, const G4Material *, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
 
G4double ComputeCrossSectionPerAtom (const G4ParticleDefinition *, const G4Element *, G4double kinEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
 
G4int SelectIsotopeNumber (const G4Element *)
 
const G4Element * SelectRandomAtom (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
 
const G4Element * SelectRandomAtom (const G4Material *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
 
void SetParticleChange (G4VParticleChange *, G4VEmFluctuationModel *f=0)
 
void SetCrossSectionTable (G4PhysicsTable *)
 
G4PhysicsTable * GetCrossSectionTable ()
 
G4VEmFluctuationModel * GetModelOfFluctuations ()
 
G4VEmAngularDistribution * GetAngularDistribution ()
 
void SetAngularDistribution (G4VEmAngularDistribution *)
 
G4double HighEnergyLimit () const
 
G4double LowEnergyLimit () const
 
G4double HighEnergyActivationLimit () const
 
G4double LowEnergyActivationLimit () const
 
G4double PolarAngleLimit () const
 
G4double SecondaryThreshold () const
 
G4bool LPMFlag () const
 
G4bool DeexcitationFlag () const
 
G4bool ForceBuildTableFlag () const
 
void SetHighEnergyLimit (G4double)
 
void SetLowEnergyLimit (G4double)
 
void SetActivationHighEnergyLimit (G4double)
 
void SetActivationLowEnergyLimit (G4double)
 
G4bool IsActive (G4double kinEnergy)
 
void SetPolarAngleLimit (G4double)
 
void SetSecondaryThreshold (G4double)
 
void SetLPMFlag (G4bool val)
 
void SetDeexcitationFlag (G4bool val)
 
void ForceBuildTable (G4bool val)
 
G4double MaxSecondaryKinEnergy (const G4DynamicParticle *dynParticle)
 
const G4String & GetName () const
 
void SetCurrentCouple (const G4MaterialCutsCouple *)
 
const G4Element * GetCurrentElement () const
 

Protected Attributes

G4ParticleChangeForGamma * fParticleChange
 
- Protected Attributes inherited from G4VEmModel
G4VParticleChange * pParticleChange
 
G4PhysicsTable * xSectionTable
 
const std::vector< G4double > * theDensityFactor
 
const std::vector< G4int > * theDensityIdx
 

Additional Inherited Members

- Protected Member Functions inherited from G4VEmModel
G4ParticleChangeForLoss * GetParticleChangeForLoss ()
 
G4ParticleChangeForGamma * GetParticleChangeForGamma ()
 
virtual G4double MaxSecondaryEnergy (const G4ParticleDefinition *, G4double kineticEnergy)
 
const G4MaterialCutsCouple * CurrentCouple () const
 
void SetCurrentElement (const G4Element *)
 

Detailed Description

Definition at line 55 of file G4PenelopeAnnihilationModel.hh.

Constructor & Destructor Documentation

◆ G4PenelopeAnnihilationModel()

G4PenelopeAnnihilationModel::G4PenelopeAnnihilationModel ( const G4ParticleDefinition *  p = 0,
const G4String &  processName = "PenAnnih" 
)

Definition at line 50 of file G4PenelopeAnnihilationModel.cc.

52 :G4VEmModel(nam),fParticleChange(0),isInitialised(false)
53{
54 fIntrinsicLowEnergyLimit = 0.0;
55 fIntrinsicHighEnergyLimit = 100.0*GeV;
56 // SetLowEnergyLimit(fIntrinsicLowEnergyLimit);
57 SetHighEnergyLimit(fIntrinsicHighEnergyLimit);
58
59 //Calculate variable that will be used later on
60 fPielr2 = pi*classic_electr_radius*classic_electr_radius;
61
62 verboseLevel= 0;
63 // Verbosity scale:
64 // 0 = nothing
65 // 1 = warning for energy non-conservation
66 // 2 = details of energy budget
67 // 3 = calculation of cross sections, file openings, sampling of atoms
68 // 4 = entering in methods
69
70}
G4PenelopeAnnihilationModel::fParticleChange
G4ParticleChangeForGamma * fParticleChange
Definition: G4PenelopeAnnihilationModel.hh:83
G4VEmModel::SetHighEnergyLimit
void SetHighEnergyLimit(G4double)
Definition: G4VEmModel.hh:585
G4INCL::Math::pi
const G4double pi
Definition: G4INCLGlobals.hh:70

◆ ~G4PenelopeAnnihilationModel()

G4PenelopeAnnihilationModel::~G4PenelopeAnnihilationModel ( )
virtual

Definition at line 74 of file G4PenelopeAnnihilationModel.cc.

75{;}

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

G4double G4PenelopeAnnihilationModel::ComputeCrossSectionPerAtom ( const G4ParticleDefinition *  ,
G4double  kinEnergy,
G4double  Z,
G4double  A = 0,
G4double  cut = 0,
G4double  emax = DBL_MAX 
)
virtual

Reimplemented from G4VEmModel.

Definition at line 100 of file G4PenelopeAnnihilationModel.cc.

105{
106 if (verboseLevel > 3)
107 G4cout << "Calling ComputeCrossSectionPerAtom() of G4PenelopeAnnihilationModel" <<
108 G4endl;
109
110 G4double cs = Z*ComputeCrossSectionPerElectron(energy);
111
112 if (verboseLevel > 2)
113 G4cout << "Annihilation cross Section at " << energy/keV << " keV for Z=" << Z <<
114 " = " << cs/barn << " barn" << G4endl;
115 return cs;
116}
G4double
double G4double
Definition: G4Types.hh:64
G4endl
#define G4endl
Definition: G4ios.hh:52
G4cout
G4DLLIMPORT std::ostream G4cout

◆ GetVerbosityLevel()

G4int G4PenelopeAnnihilationModel::GetVerbosityLevel ( )
inline

Definition at line 80 of file G4PenelopeAnnihilationModel.hh.

80{return verboseLevel;};

◆ Initialise()

void G4PenelopeAnnihilationModel::Initialise ( const G4ParticleDefinition *  ,
const G4DataVector &   
)
virtual

Implements G4VEmModel.

Definition at line 79 of file G4PenelopeAnnihilationModel.cc.

81{
82 if (verboseLevel > 3)
83 G4cout << "Calling G4PenelopeAnnihilationModel::Initialise()" << G4endl;
84
85 if(verboseLevel > 0) {
86 G4cout << "Penelope Annihilation model is initialized " << G4endl
87 << "Energy range: "
88 << LowEnergyLimit() / keV << " keV - "
89 << HighEnergyLimit() / GeV << " GeV"
90 << G4endl;
91 }
92
93 if(isInitialised) return;
94 fParticleChange = GetParticleChangeForGamma();
95 isInitialised = true;
96}
G4VEmModel::GetParticleChangeForGamma
G4ParticleChangeForGamma * GetParticleChangeForGamma()
Definition: G4VEmModel.cc:109
G4VEmModel::LowEnergyLimit
G4double LowEnergyLimit() const
Definition: G4VEmModel.hh:529
G4VEmModel::HighEnergyLimit
G4double HighEnergyLimit() const
Definition: G4VEmModel.hh:522

◆ SampleSecondaries()

void G4PenelopeAnnihilationModel::SampleSecondaries ( std::vector< G4DynamicParticle * > *  fvect,
const G4MaterialCutsCouple *  ,
const G4DynamicParticle *  aDynamicPositron,
G4double  tmin,
G4double  maxEnergy 
)
virtual

Implements G4VEmModel.

Definition at line 120 of file G4PenelopeAnnihilationModel.cc.

125{
126 //
127 // Penelope model to sample final state for positron annihilation.
128 // Target eletrons are assumed to be free and at rest. Binding effects enabling
129 // one-photon annihilation are neglected.
130 // For annihilation at rest, two back-to-back photons are emitted, having energy of 511 keV
131 // and isotropic angular distribution.
132 // For annihilation in flight, it is used the theory from
133 // W. Heitler, The quantum theory of radiation, Oxford University Press (1954)
134 // The two photons can have different energy. The efficiency of the sampling algorithm
135 // of the photon energy from the dSigma/dE distribution is practically 100% for
136 // positrons of kinetic energy < 10 keV. It reaches a minimum (about 80%) at energy
137 // of about 10 MeV.
138 // The angle theta is kinematically linked to the photon energy, to ensure momentum
139 // conservation. The angle phi is sampled isotropically for the first gamma.
140 //
141 if (verboseLevel > 3)
142 G4cout << "Calling SamplingSecondaries() of G4PenelopeAnnihilationModel" << G4endl;
143
144 G4double kineticEnergy = aDynamicPositron->GetKineticEnergy();
145
146 // kill primary
147 fParticleChange->SetProposedKineticEnergy(0.);
148 fParticleChange->ProposeTrackStatus(fStopAndKill);
149
150 if (kineticEnergy == 0.0)
151 {
152 //Old AtRestDoIt
153 G4double cosTheta = -1.0+2.0*G4UniformRand();
154 G4double sinTheta = std::sqrt(1.0-cosTheta*cosTheta);
155 G4double phi = twopi*G4UniformRand();
156 G4ThreeVector direction (sinTheta*std::cos(phi),sinTheta*std::sin(phi),cosTheta);
157 G4DynamicParticle* firstGamma = new G4DynamicParticle (G4Gamma::Gamma(),
158 direction, electron_mass_c2);
159 G4DynamicParticle* secondGamma = new G4DynamicParticle (G4Gamma::Gamma(),
160 -direction, electron_mass_c2);
161
162 fvect->push_back(firstGamma);
163 fvect->push_back(secondGamma);
164 return;
165 }
166
167 //This is the "PostStep" case (annihilation in flight)
168 G4ParticleMomentum positronDirection =
169 aDynamicPositron->GetMomentumDirection();
170 G4double gamma = 1.0 + std::max(kineticEnergy,1.0*eV)/electron_mass_c2;
171 G4double gamma21 = std::sqrt(gamma*gamma-1);
172 G4double ani = 1.0+gamma;
173 G4double chimin = 1.0/(ani+gamma21);
174 G4double rchi = (1.0-chimin)/chimin;
175 G4double gt0 = ani*ani-2.0;
176 G4double test=0.0;
177 G4double epsilon = 0;
178 do{
179 epsilon = chimin*std::pow(rchi,G4UniformRand());
180 G4double reject = ani*ani*(1.0-epsilon)+2.0*gamma-(1.0/epsilon);
181 test = G4UniformRand()*gt0-reject;
182 }while(test>0);
183
184 G4double totalAvailableEnergy = kineticEnergy + 2.0*electron_mass_c2;
185 G4double photon1Energy = epsilon*totalAvailableEnergy;
186 G4double photon2Energy = (1.0-epsilon)*totalAvailableEnergy;
187 G4double cosTheta1 = (ani-1.0/epsilon)/gamma21;
188 G4double cosTheta2 = (ani-1.0/(1.0-epsilon))/gamma21;
189
190 //G4double localEnergyDeposit = 0.;
191
192 G4double sinTheta1 = std::sqrt(1.-cosTheta1*cosTheta1);
193 G4double phi1 = twopi * G4UniformRand();
194 G4double dirx1 = sinTheta1 * std::cos(phi1);
195 G4double diry1 = sinTheta1 * std::sin(phi1);
196 G4double dirz1 = cosTheta1;
197
198 G4double sinTheta2 = std::sqrt(1.-cosTheta2*cosTheta2);
199 G4double phi2 = phi1+pi;
200 G4double dirx2 = sinTheta2 * std::cos(phi2);
201 G4double diry2 = sinTheta2 * std::sin(phi2);
202 G4double dirz2 = cosTheta2;
203
204 G4ThreeVector photon1Direction (dirx1,diry1,dirz1);
205 photon1Direction.rotateUz(positronDirection);
206 // create G4DynamicParticle object for the particle1
207 G4DynamicParticle* aParticle1= new G4DynamicParticle (G4Gamma::Gamma(),
208 photon1Direction,
209 photon1Energy);
210 fvect->push_back(aParticle1);
211
212 G4ThreeVector photon2Direction(dirx2,diry2,dirz2);
213 photon2Direction.rotateUz(positronDirection);
214 // create G4DynamicParticle object for the particle2
215 G4DynamicParticle* aParticle2= new G4DynamicParticle (G4Gamma::Gamma(),
216 photon2Direction,
217 photon2Energy);
218 fvect->push_back(aParticle2);
219
220 if (verboseLevel > 1)
221 {
222 G4cout << "-----------------------------------------------------------" << G4endl;
223 G4cout << "Energy balance from G4PenelopeAnnihilation" << G4endl;
224 G4cout << "Kinetic positron energy: " << kineticEnergy/keV << " keV" << G4endl;
225 G4cout << "Total available energy: " << totalAvailableEnergy/keV << " keV " << G4endl;
226 G4cout << "-----------------------------------------------------------" << G4endl;
227 G4cout << "Photon energy 1: " << photon1Energy/keV << " keV" << G4endl;
228 G4cout << "Photon energy 2: " << photon2Energy/keV << " keV" << G4endl;
229 G4cout << "Total final state: " << (photon1Energy+photon2Energy)/keV <<
230 " keV" << G4endl;
231 G4cout << "-----------------------------------------------------------" << G4endl;
232 }
233 if (verboseLevel > 0)
234 {
235 G4double energyDiff = std::fabs(totalAvailableEnergy-photon1Energy-photon2Energy);
236 if (energyDiff > 0.05*keV)
237 G4cout << "Warning from G4PenelopeAnnihilation: problem with energy conservation: " <<
238 (photon1Energy+photon2Energy)/keV <<
239 " keV (final) vs. " <<
240 totalAvailableEnergy/keV << " keV (initial)" << G4endl;
241 }
242 return;
243}
fStopAndKill
@ fStopAndKill
Definition: G4TrackStatus.hh:56
G4UniformRand
#define G4UniformRand()
Definition: Randomize.hh:53
G4DynamicParticle::GetMomentumDirection
const G4ThreeVector & GetMomentumDirection() const
G4DynamicParticle::GetKineticEnergy
G4double GetKineticEnergy() const
G4Gamma::Gamma
static G4Gamma * Gamma()
Definition: G4Gamma.cc:86
G4ParticleChangeForGamma::SetProposedKineticEnergy
void SetProposedKineticEnergy(G4double proposedKinEnergy)
Definition: G4ParticleChangeForGamma.hh:129
G4VParticleChange::ProposeTrackStatus
void ProposeTrackStatus(G4TrackStatus status)

◆ SetVerbosityLevel()

void G4PenelopeAnnihilationModel::SetVerbosityLevel ( G4int  lev)
inline

Definition at line 79 of file G4PenelopeAnnihilationModel.hh.

79{verboseLevel = lev;};

Member Data Documentation

◆ fParticleChange

G4ParticleChangeForGamma* G4PenelopeAnnihilationModel::fParticleChange
protected

Definition at line 83 of file G4PenelopeAnnihilationModel.hh.

Referenced by Initialise(), and SampleSecondaries().

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