Geant4 11.3.0
Toolkit for the simulation of the passage of particles through matter
Loading...
Searching...
No Matches
Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
G4MuonToMuonPairProductionModel Class Reference

#include <G4MuonToMuonPairProductionModel.hh>

+ Inheritance diagram for G4MuonToMuonPairProductionModel:

Public Member Functions

 G4MuonToMuonPairProductionModel (const G4ParticleDefinition *p=nullptr, const G4String &nam="muToMuonPairProd")
 
 ~G4MuonToMuonPairProductionModel () override=default
 
G4MuonToMuonPairProductionModel & operator= (const G4MuonToMuonPairProductionModel &right)=delete
 
 G4MuonToMuonPairProductionModel (const G4MuonToMuonPairProductionModel &)=delete
 
G4double ComputeDMicroscopicCrossSection (G4double tkin, G4double Z, G4double pairEnergy) override
 
void SampleSecondaries (std::vector< G4DynamicParticle * > *, const G4MaterialCutsCouple *, const G4DynamicParticle *, G4double tmin, G4double maxEnergy) override
 
G4double U_func (G4double Z, G4double rho2, G4double xi, G4double Y, G4double pairEnergy, const G4double B=183)
 
- Public Member Functions inherited from G4MuPairProductionModel
 G4MuPairProductionModel (const G4ParticleDefinition *p=nullptr, const G4String &nam="muPairProd")
 
 ~G4MuPairProductionModel () override=default
 
void Initialise (const G4ParticleDefinition *, const G4DataVector &) override
 
void InitialiseLocal (const G4ParticleDefinition *, G4VEmModel *masterModel) override
 
G4double ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kineticEnergy, G4double Z, G4double A, G4double cutEnergy, G4double maxEnergy) override
 
G4double ComputeDEDXPerVolume (const G4Material *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy) override
 
void SampleSecondaries (std::vector< G4DynamicParticle * > *, const G4MaterialCutsCouple *, const G4DynamicParticle *, G4double tmin, G4double maxEnergy) override
 
G4double MinPrimaryEnergy (const G4Material *, const G4ParticleDefinition *, G4double) override
 
void SetLowestKineticEnergy (G4double e)
 
void SetParticle (const G4ParticleDefinition *)
 
G4MuPairProductionModel & operator= (const G4MuPairProductionModel &right)=delete
 
 G4MuPairProductionModel (const G4MuPairProductionModel &)=delete
 
- Public Member Functions inherited from G4VEmModel
 G4VEmModel (const G4String &nam)
 
virtual ~G4VEmModel ()
 
virtual void InitialiseForMaterial (const G4ParticleDefinition *, const G4Material *)
 
virtual void InitialiseForElement (const G4ParticleDefinition *, G4int Z)
 
virtual G4double CrossSectionPerVolume (const G4Material *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
 
virtual G4double GetPartialCrossSection (const G4Material *, G4int level, const G4ParticleDefinition *, G4double kineticEnergy)
 
virtual G4double ComputeCrossSectionPerShell (const G4ParticleDefinition *, G4int Z, G4int shellIdx, G4double kinEnergy, 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 *, const G4double &length, G4double &eloss)
 
virtual G4double Value (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy)
 
virtual G4double MinEnergyCut (const G4ParticleDefinition *, const G4MaterialCutsCouple *)
 
virtual void SetupForMaterial (const G4ParticleDefinition *, const G4Material *, G4double kineticEnergy)
 
virtual void DefineForRegion (const G4Region *)
 
virtual void FillNumberOfSecondaries (G4int &numberOfTriplets, G4int &numberOfRecoil)
 
virtual void ModelDescription (std::ostream &outFile) const
 
void InitialiseElementSelectors (const G4ParticleDefinition *, const G4DataVector &)
 
std::vector< G4EmElementSelector * > * GetElementSelectors ()
 
void SetElementSelectors (std::vector< G4EmElementSelector * > *)
 
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)
 
const G4Element * SelectRandomAtom (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
 
const G4Element * SelectTargetAtom (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy, G4double logKineticEnergy, 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)
 
const G4Element * GetCurrentElement (const G4Material *mat=nullptr) const
 
G4int SelectRandomAtomNumber (const G4Material *) const
 
const G4Isotope * GetCurrentIsotope (const G4Element *elm=nullptr) const
 
G4int SelectIsotopeNumber (const G4Element *) const
 
void SetParticleChange (G4VParticleChange *, G4VEmFluctuationModel *f=nullptr)
 
void SetCrossSectionTable (G4PhysicsTable *, G4bool isLocal)
 
G4ElementData * GetElementData ()
 
G4PhysicsTable * GetCrossSectionTable ()
 
G4VEmFluctuationModel * GetModelOfFluctuations ()
 
G4VEmAngularDistribution * GetAngularDistribution ()
 
G4VEmModel * GetTripletModel ()
 
void SetTripletModel (G4VEmModel *)
 
void SetAngularDistribution (G4VEmAngularDistribution *)
 
G4double HighEnergyLimit () const
 
G4double LowEnergyLimit () const
 
G4double HighEnergyActivationLimit () const
 
G4double LowEnergyActivationLimit () const
 
G4double PolarAngleLimit () const
 
G4double SecondaryThreshold () const
 
G4bool DeexcitationFlag () const
 
G4bool ForceBuildTableFlag () const
 
G4bool UseAngularGeneratorFlag () const
 
void SetAngularGeneratorFlag (G4bool)
 
void SetHighEnergyLimit (G4double)
 
void SetLowEnergyLimit (G4double)
 
void SetActivationHighEnergyLimit (G4double)
 
void SetActivationLowEnergyLimit (G4double)
 
G4bool IsActive (G4double kinEnergy) const
 
void SetPolarAngleLimit (G4double)
 
void SetSecondaryThreshold (G4double)
 
void SetDeexcitationFlag (G4bool val)
 
void SetForceBuildTable (G4bool val)
 
void SetFluctuationFlag (G4bool val)
 
G4bool IsMaster () const
 
void SetUseBaseMaterials (G4bool val)
 
G4bool UseBaseMaterials () const
 
G4double MaxSecondaryKinEnergy (const G4DynamicParticle *dynParticle)
 
const G4String & GetName () const
 
void SetCurrentCouple (const G4MaterialCutsCouple *)
 
G4bool IsLocked () const
 
void SetLocked (G4bool)
 
void SetLPMFlag (G4bool)
 
void SetMasterThread (G4bool)
 
G4VEmModel & operator= (const G4VEmModel &right)=delete
 
 G4VEmModel (const G4VEmModel &)=delete
 

Protected Member Functions

void DataCorrupted (G4int Z, G4double logTkin) const override
 
- Protected Member Functions inherited from G4MuPairProductionModel
G4double ComputMuPairLoss (G4double Z, G4double tkin, G4double cut, G4double tmax)
 
G4double ComputeMicroscopicCrossSection (G4double tkin, G4double Z, G4double cut)
 
G4double FindScaledEnergy (G4int Z, G4double rand, G4double logTkin, G4double yymin, G4double yymax)
 
G4double MaxSecondaryEnergyForElement (G4double kineticEnergy, G4double Z)
 
void MakeSamplingTables ()
 
void StoreTables () const
 
G4bool RetrieveTables ()
 
- 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 *)
 

Protected Attributes

G4ParticleDefinition * theMuonMinus = nullptr
 
G4ParticleDefinition * theMuonPlus = nullptr
 
G4double factorForCross
 
G4double minPairEnergy
 
G4double muonMass
 
G4double mueRatio
 
- Protected Attributes inherited from G4MuPairProductionModel
G4ParticleChangeForLoss * fParticleChange = nullptr
 
const G4ParticleDefinition * particle = nullptr
 
G4NistManager * nist = nullptr
 
G4double factorForCross
 
G4double sqrte
 
G4double particleMass = 0.0
 
G4double z13 = 0.0
 
G4double z23 = 0.0
 
G4double lnZ = 0.0
 
G4double minPairEnergy
 
G4double lowestKinEnergy
 
G4double emin
 
G4double emax
 
G4double ymin = -5.0
 
G4double dy = 0.005
 
G4int currentZ = 0
 
G4int nYBinPerDecade = 4
 
std::size_t nbiny = 1000
 
std::size_t nbine = 0
 
G4bool fTableToFile = false
 
- Protected Attributes inherited from G4VEmModel
G4ElementData * fElementData = nullptr
 
G4VParticleChange * pParticleChange = nullptr
 
G4PhysicsTable * xSectionTable = nullptr
 
const G4Material * pBaseMaterial = nullptr
 
const std::vector< G4double > * theDensityFactor = nullptr
 
const std::vector< G4int > * theDensityIdx = nullptr
 
G4double inveplus
 
G4double pFactor = 1.0
 
std::size_t currentCoupleIndex = 0
 
std::size_t basedCoupleIndex = 0
 
G4bool lossFlucFlag = true
 

Additional Inherited Members

- Static Protected Attributes inherited from G4MuPairProductionModel
static const G4int NZDATPAIR = 5
 
static const G4int NINTPAIR = 8
 
static const G4int ZDATPAIR [NZDATPAIR] = {1, 4, 13, 29, 92}
 
static const G4double xgi [NINTPAIR]
 
static const G4double wgi [NINTPAIR]
 

Detailed Description

Definition at line 61 of file G4MuonToMuonPairProductionModel.hh.

Constructor & Destructor Documentation

◆ G4MuonToMuonPairProductionModel() [1/2]

G4MuonToMuonPairProductionModel::G4MuonToMuonPairProductionModel ( const G4ParticleDefinition * p = nullptr,
const G4String & nam = "muToMuonPairProd" )
explicit

Definition at line 61 of file G4MuonToMuonPairProductionModel.cc.

64 : G4MuPairProductionModel(p, nam)
65{
66 theMuonMinus = G4MuonMinus::MuonMinus();
67 theMuonPlus = G4MuonPlus::MuonPlus();
68 muonMass = theMuonPlus->GetPDGMass();
69 minPairEnergy = 2.*muonMass;
70 mueRatio = muonMass/CLHEP::electron_mass_c2;
71 factorForCross = 2./(3*CLHEP::pi)*
72 std::pow(CLHEP::fine_structure_const*CLHEP::classic_electr_radius/mueRatio, 2);
73}
G4MuPairProductionModel::G4MuPairProductionModel
G4MuPairProductionModel(const G4ParticleDefinition *p=nullptr, const G4String &nam="muPairProd")
Definition G4MuPairProductionModel.cc:118
G4MuonMinus::MuonMinus
static G4MuonMinus * MuonMinus()
Definition G4MuonMinus.cc:99
G4MuonPlus::MuonPlus
static G4MuonPlus * MuonPlus()
Definition G4MuonPlus.cc:98

Referenced by G4MuonToMuonPairProductionModel(), and operator=().

◆ ~G4MuonToMuonPairProductionModel()

G4MuonToMuonPairProductionModel::~G4MuonToMuonPairProductionModel ( )
overridedefault

◆ G4MuonToMuonPairProductionModel() [2/2]

G4MuonToMuonPairProductionModel::G4MuonToMuonPairProductionModel ( const G4MuonToMuonPairProductionModel & )
delete

Member Function Documentation

◆ ComputeDMicroscopicCrossSection()

G4double G4MuonToMuonPairProductionModel::ComputeDMicroscopicCrossSection ( G4double tkin,
G4double Z,
G4double pairEnergy )
overridevirtual

Reimplemented from G4MuPairProductionModel.

Definition at line 77 of file G4MuonToMuonPairProductionModel.cc.

84{
85 if (pairEnergy <= minPairEnergy)
86 return 0.0;
87
88 G4double totalEnergy = tkin + particleMass;
89 G4double residEnergy = totalEnergy - pairEnergy;
90
91 if (residEnergy <= muonMass) { return 0.0; }
92
93 G4double a0 = 1.0 / (totalEnergy * residEnergy);
94 G4double rhomax = 1.0 - 2*muonMass/pairEnergy;
95 G4double tmnexp = 1. - rhomax;
96
97 if(tmnexp >= 1.0) { return 0.0; }
98
99 G4double tmn = G4Log(tmnexp);
100
101 G4double z2 = Z*Z;
102 G4double beta = 0.5*pairEnergy*pairEnergy*a0;
103 G4double xi0 = 0.5*beta;
104
105 // Gaussian integration in ln(1-ro) ( with NINTPAIR points)
106 G4double rho[NINTPAIR];
107 G4double rho2[NINTPAIR];
108 G4double xi[NINTPAIR];
109 G4double xi1[NINTPAIR];
110 G4double xii[NINTPAIR];
111
112 for (G4int i = 0; i < NINTPAIR; ++i)
113 {
114 rho[i] = G4Exp(tmn*xgi[i]) - 1.0; // rho = -asymmetry
115 rho2[i] = rho[i] * rho[i];
116 xi[i] = xi0*(1.0-rho2[i]);
117 xi1[i] = 1.0 + xi[i];
118 xii[i] = 1.0 / xi[i];
119 }
120
121 G4double ximax = xi0*(1. - rhomax*rhomax);
122
123 G4double Y = 10 * std::sqrt(particleMass/totalEnergy);
124 G4double U[8];
125
126 for (G4int i = 0; i < NINTPAIR; ++i)
127 {
128 U[i] = U_func(Z, rho2[i], xi[i], Y, pairEnergy);
129 }
130
131 G4double UMax = U_func(Z, rhomax*rhomax, ximax, Y, pairEnergy);
132
133 G4double sum = 0.0;
134 for (G4int i = 0; i < NINTPAIR; ++i)
135 {
136 G4double X = 1 + U[i] - UMax;
137 G4double lnX = G4Log(X);
138 G4double phi = ((2 + rho2[i])*(1 + beta) + xi[i]*(3 + rho2[i]))*
139 G4Log(1 + xii[i]) - 1 - 3*rho2[i] + beta*(1 - 2*rho2[i])
140 + ((1 + rho2[i])*(1 + 1.5*beta) - xii[i]*(1 + 2*beta)
141 *(1 - rho2[i]))*G4Log(xi1[i]);
142 sum += wgi[i]*(1.0 + rho[i])*phi*lnX;
143 }
144
145 return -tmn*sum*factorForCross*z2*residEnergy/(totalEnergy*pairEnergy);
146
147}
Y
G4double Y(G4double density)
Definition G4DNAElectronHoleRecombination.cc:57
G4Exp
G4double G4Exp(G4double initial_x)
Exponential Function double precision.
Definition G4Exp.hh:180
a0
const G4double a0
Definition G4IonCoulombCrossSection.cc:68
G4Log
G4double G4Log(G4double x)
Definition G4Log.hh:227
G4double
double G4double
Definition G4Types.hh:83
G4int
int G4int
Definition G4Types.hh:85
G4MuPairProductionModel::xgi
static const G4double xgi[NINTPAIR]
Definition G4MuPairProductionModel.hh:98
G4MuPairProductionModel::wgi
static const G4double wgi[NINTPAIR]
Definition G4MuPairProductionModel.hh:103
G4MuonToMuonPairProductionModel::U_func
G4double U_func(G4double Z, G4double rho2, G4double xi, G4double Y, G4double pairEnergy, const G4double B=183)
Definition G4MuonToMuonPairProductionModel.cc:149

◆ DataCorrupted()

void G4MuonToMuonPairProductionModel::DataCorrupted ( G4int Z,
G4double logTkin ) const
overrideprotectedvirtual

Reimplemented from G4MuPairProductionModel.

Definition at line 297 of file G4MuonToMuonPairProductionModel.cc.

298{
299 G4ExceptionDescription ed;
300 ed << "G4ElementData is not properly initialized Z= " << Z
301 << " Ekin(MeV)= " << G4Exp(logTkin)
302 << " IsMasterThread= " << IsMaster()
303 << " Model " << GetName();
304 G4Exception("G4MuonToMuonPairProductionModel","em0033",FatalException,ed,"");
305}
FatalException
@ FatalException
Definition G4ExceptionSeverity.hh:67
G4Exception
void G4Exception(const char *originOfException, const char *exceptionCode, G4ExceptionSeverity severity, const char *description)
Definition G4Exception.cc:59
G4ExceptionDescription
std::ostringstream G4ExceptionDescription
Definition G4Exception.hh:40
G4VEmModel::IsMaster
G4bool IsMaster() const
Definition G4VEmModel.hh:710
G4VEmModel::GetName
const G4String & GetName() const
Definition G4VEmModel.hh:794

◆ operator=()

G4MuonToMuonPairProductionModel & G4MuonToMuonPairProductionModel::operator= ( const G4MuonToMuonPairProductionModel & right)
delete

◆ SampleSecondaries()

void G4MuonToMuonPairProductionModel::SampleSecondaries ( std::vector< G4DynamicParticle * > * vdp,
const G4MaterialCutsCouple * couple,
const G4DynamicParticle * aDynamicParticle,
G4double tmin,
G4double maxEnergy )
overridevirtual

Implements G4VEmModel.

Definition at line 166 of file G4MuonToMuonPairProductionModel.cc.

172{
173 G4double kinEnergy = aDynamicParticle->GetKineticEnergy();
174 //G4cout << "--- G4MuonToMuonPairProductionModel::SampleSecondaries E(MeV)= "
175 // << kinEnergy << " "
176 // << aDynamicParticle->GetDefinition()->GetParticleName() << G4endl;
177 G4double totalMomentum = std::sqrt(kinEnergy*(kinEnergy + 2.0*muonMass));
178
179 G4ThreeVector partDirection = aDynamicParticle->GetMomentumDirection();
180
181 // select randomly one element constituing the material
182 const G4Element* anElement = SelectRandomAtom(couple,particle,kinEnergy);
183
184 // define interval of energy transfer
185 G4double maxPairEnergy = MaxSecondaryEnergyForElement(kinEnergy,
186 anElement->GetZ());
187 G4double maxEnergy = std::min(tmax, maxPairEnergy);
188 G4double minEnergy = std::max(tmin, minPairEnergy);
189
190 if(minEnergy >= maxEnergy) { return; }
191 //G4cout << "emin= " << minEnergy << " emax= " << maxEnergy
192 // << " minPair= " << minPairEnergy << " maxpair= " << maxPairEnergy
193 // << " ymin= " << ymin << " dy= " << dy << G4endl;
194
195 G4double coeff = G4Log(minPairEnergy/kinEnergy)/ymin;
196
197 // compute limits
198 G4double yymin = G4Log(minEnergy/kinEnergy)/coeff;
199 G4double yymax = G4Log(maxEnergy/kinEnergy)/coeff;
200
201 //G4cout << "yymin= " << yymin << " yymax= " << yymax << G4endl;
202
203 // units should not be used, bacause table was built without
204 G4double logTkin = G4Log(kinEnergy/CLHEP::MeV);
205
206 // sample mu-mu+ pair energy first
207
208 // select sample table via Z
209 G4int iz1(0), iz2(0);
210 for(G4int iz=0; iz<NZDATPAIR; ++iz) {
211 if(currentZ == ZDATPAIR[iz]) {
212 iz1 = iz2 = iz;
213 break;
214 } else if(currentZ < ZDATPAIR[iz]) {
215 iz2 = iz;
216 if(iz > 0) { iz1 = iz-1; }
217 else { iz1 = iz2; }
218 break;
219 }
220 }
221 if(0 == iz1) { iz1 = iz2 = NZDATPAIR-1; }
222
223 G4double pairEnergy = 0.0;
224 G4int count = 0;
225 //G4cout << "start loop Z1= " << iz1 << " Z2= " << iz2 << G4endl;
226 do {
227 ++count;
228 // sampling using only one random number
229 G4double rand = G4UniformRand();
230
231 G4double x = FindScaledEnergy(iz1, rand, logTkin, yymin, yymax);
232 if(iz1 != iz2) {
233 G4double x2 = FindScaledEnergy(iz2, rand, logTkin, yymin, yymax);
234 G4double lz1= nist->GetLOGZ(ZDATPAIR[iz1]);
235 G4double lz2= nist->GetLOGZ(ZDATPAIR[iz2]);
236 //G4cout << count << ". x= " << x << " x2= " << x2
237 // << " Z1= " << iz1 << " Z2= " << iz2 << G4endl;
238 x += (x2 - x)*(lnZ - lz1)/(lz2 - lz1);
239 }
240 //G4cout << "x= " << x << " coeff= " << coeff << G4endl;
241 pairEnergy = kinEnergy*G4Exp(x*coeff);
242
243 // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
244 } while((pairEnergy < minEnergy || pairEnergy > maxEnergy) && 10 > count);
245
246 //G4cout << "## pairEnergy(GeV)= " << pairEnergy/GeV
247 // << " Etot(GeV)= " << totalEnergy/GeV << G4endl;
248
249 // sample r=(mu+mu-)/pairEnergy ( uniformly .....)
250 G4double rmax = 1 - 2*muonMass/(pairEnergy);
251 G4double r = rmax * (-1.+2.*G4UniformRand()) ;
252
253 // compute energies from pairEnergy,r
254 G4double muMinusEnergy = (1.-r)*pairEnergy*0.5;
255 G4double muPlusEnergy = pairEnergy - muMinusEnergy;
256
257 // Sample angles
258 G4ThreeVector muMinusDirection, muPlusDirection;
259 //
260 GetAngularDistribution()->SamplePairDirections(aDynamicParticle,
261 muMinusEnergy, muPlusEnergy,
262 muMinusDirection, muPlusDirection);
263 // create G4DynamicParticle object for mu+mu-
264 muMinusEnergy = std::max(muMinusEnergy - muonMass, 0.0);
265 muPlusEnergy = std::max(muPlusEnergy - muonMass, 0.0);
266 G4DynamicParticle* aParticle1 =
267 new G4DynamicParticle(theMuonMinus,muMinusDirection,muMinusEnergy);
268 G4DynamicParticle* aParticle2 =
269 new G4DynamicParticle(theMuonPlus,muPlusDirection,muPlusEnergy);
270 // Fill output vector
271 vdp->push_back(aParticle1);
272 vdp->push_back(aParticle2);
273
274 // primary change
275 kinEnergy -= pairEnergy;
276 partDirection *= totalMomentum;
277 partDirection -= (aParticle1->GetMomentum() + aParticle2->GetMomentum());
278 partDirection = partDirection.unit();
279
280 // if energy transfer is higher than threshold (very high by default)
281 // then stop tracking the primary particle and create a new secondary
282 if (pairEnergy > SecondaryThreshold()) {
283 fParticleChange->ProposeTrackStatus(fStopAndKill);
284 fParticleChange->SetProposedKineticEnergy(0.0);
285 G4DynamicParticle* newdp =
286 new G4DynamicParticle(particle, partDirection, kinEnergy);
287 vdp->push_back(newdp);
288 } else { // continue tracking the primary e-/e+ otherwise
289 fParticleChange->SetProposedMomentumDirection(partDirection);
290 fParticleChange->SetProposedKineticEnergy(kinEnergy);
291 }
292 //G4cout << "--- G4MuonToMuonPairProductionModel::SampleSecondaries done" << G4endl;
293}
G4ThreeVector
CLHEP::Hep3Vector G4ThreeVector
Definition G4ThreeVector.hh:36
fStopAndKill
@ fStopAndKill
Definition G4TrackStatus.hh:46
G4UniformRand
#define G4UniformRand()
Definition Randomize.hh:52
CLHEP::Hep3Vector::unit
Hep3Vector unit() const
G4DynamicParticle::GetMomentumDirection
const G4ThreeVector & GetMomentumDirection() const
G4DynamicParticle::GetKineticEnergy
G4double GetKineticEnergy() const
G4DynamicParticle::GetMomentum
G4ThreeVector GetMomentum() const
G4Element::GetZ
G4double GetZ() const
Definition G4Element.hh:119
G4MuPairProductionModel::FindScaledEnergy
G4double FindScaledEnergy(G4int Z, G4double rand, G4double logTkin, G4double yymin, G4double yymax)
Definition G4MuPairProductionModel.cc:683
G4MuPairProductionModel::particle
const G4ParticleDefinition * particle
Definition G4MuPairProductionModel.hh:144
G4MuPairProductionModel::fParticleChange
G4ParticleChangeForLoss * fParticleChange
Definition G4MuPairProductionModel.hh:143
G4MuPairProductionModel::ZDATPAIR
static const G4int ZDATPAIR[NZDATPAIR]
Definition G4MuPairProductionModel.hh:96
G4MuPairProductionModel::MaxSecondaryEnergyForElement
G4double MaxSecondaryEnergyForElement(G4double kineticEnergy, G4double Z)
Definition G4MuPairProductionModel.hh:204
G4VEmAngularDistribution::SamplePairDirections
virtual void SamplePairDirections(const G4DynamicParticle *dp, G4double elecKinEnergy, G4double posiKinEnergy, G4ThreeVector &dirElectron, G4ThreeVector &dirPositron, G4int Z=0, const G4Material *mat=nullptr)
Definition G4VEmAngularDistribution.cc:79
G4VEmModel::GetAngularDistribution
G4VEmAngularDistribution * GetAngularDistribution()
Definition G4VEmModel.hh:599
G4VEmModel::SelectRandomAtom
const G4Element * SelectRandomAtom(const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
Definition G4VEmModel.hh:560
G4VEmModel::SecondaryThreshold
G4double SecondaryThreshold() const
Definition G4VEmModel.hh:668

◆ U_func()

G4double G4MuonToMuonPairProductionModel::U_func ( G4double Z,
G4double rho2,
G4double xi,
G4double Y,
G4double pairEnergy,
const G4double B = 183 )

Definition at line 149 of file G4MuonToMuonPairProductionModel.cc.

153{
154 G4int Z = G4lrint(ZZ);
155 G4double A27 = nist->GetA27(Z);
156 G4double Z13 = nist->GetZ13(Z);
157 static const G4double sqe = std::sqrt(G4Exp(1.0));
158 G4double res = (0.65 * B / (A27*Z13) * mueRatio)/
159 (1 + (2*sqe*muonMass*muonMass*(B/Z13)*(1 + xi)*(1 + Y))
160 /(CLHEP::electron_mass_c2*pairEnergy*(1 - rho2)));
161 return res;
162}
B
G4double B(G4double temperature)
Definition G4DNAElectronHoleRecombination.cc:71
G4lrint
int G4lrint(double ad)
Definition templates.hh:134

Referenced by ComputeDMicroscopicCrossSection().

Member Data Documentation

◆ factorForCross

G4double G4MuonToMuonPairProductionModel::factorForCross
protected

Definition at line 95 of file G4MuonToMuonPairProductionModel.hh.

Referenced by ComputeDMicroscopicCrossSection(), and G4MuonToMuonPairProductionModel().

◆ minPairEnergy

G4double G4MuonToMuonPairProductionModel::minPairEnergy
protected

Definition at line 96 of file G4MuonToMuonPairProductionModel.hh.

Referenced by ComputeDMicroscopicCrossSection(), G4MuonToMuonPairProductionModel(), and SampleSecondaries().

◆ mueRatio

G4double G4MuonToMuonPairProductionModel::mueRatio
protected

Definition at line 98 of file G4MuonToMuonPairProductionModel.hh.

Referenced by G4MuonToMuonPairProductionModel(), and U_func().

◆ muonMass

G4double G4MuonToMuonPairProductionModel::muonMass
protected

Definition at line 97 of file G4MuonToMuonPairProductionModel.hh.

Referenced by ComputeDMicroscopicCrossSection(), G4MuonToMuonPairProductionModel(), SampleSecondaries(), and U_func().

◆ theMuonMinus

G4ParticleDefinition* G4MuonToMuonPairProductionModel::theMuonMinus = nullptr
protected

Definition at line 92 of file G4MuonToMuonPairProductionModel.hh.

Referenced by G4MuonToMuonPairProductionModel(), and SampleSecondaries().

◆ theMuonPlus

G4ParticleDefinition* G4MuonToMuonPairProductionModel::theMuonPlus = nullptr
protected

Definition at line 93 of file G4MuonToMuonPairProductionModel.hh.

Referenced by G4MuonToMuonPairProductionModel(), and SampleSecondaries().

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