Geant4 11.1.1
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
G4MollerBhabhaModel Class Reference

#include <G4MollerBhabhaModel.hh>

+ Inheritance diagram for G4MollerBhabhaModel:

Public Member Functions

 G4MollerBhabhaModel (const G4ParticleDefinition *p=nullptr, const G4String &nam="MollerBhabha")
 
 ~G4MollerBhabhaModel () override
 
void Initialise (const G4ParticleDefinition *, const G4DataVector &) override
 
virtual G4double ComputeCrossSectionPerElectron (const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy, G4double maxEnergy)
 
G4double ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kineticEnergy, G4double Z, G4double A, G4double cutEnergy, G4double maxEnergy) override
 
G4double CrossSectionPerVolume (const G4Material *, const G4ParticleDefinition *, G4double kineticEnergy, 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
 
G4MollerBhabhaModel & operator= (const G4MollerBhabhaModel &right)=delete
 
 G4MollerBhabhaModel (const G4MollerBhabhaModel &)=delete
 
- 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 void InitialiseLocal (const G4ParticleDefinition *, G4VEmModel *masterModel)
 
virtual void InitialiseForMaterial (const G4ParticleDefinition *, const G4Material *)
 
virtual void InitialiseForElement (const G4ParticleDefinition *, G4int Z)
 
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 GetPartialCrossSection (const G4Material *, G4int level, const G4ParticleDefinition *, G4double kineticEnergy)
 
virtual G4double ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kinEnergy, G4double Z, G4double A=0., G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)
 
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 MinPrimaryEnergy (const G4Material *, const G4ParticleDefinition *, G4double cut=0.0)
 
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 LPMFlag () 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 SetLPMFlag (G4bool val)
 
void SetDeexcitationFlag (G4bool val)
 
void SetForceBuildTable (G4bool val)
 
void SetFluctuationFlag (G4bool val)
 
void SetMasterThread (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)
 
G4VEmModel & operator= (const G4VEmModel &right)=delete
 
 G4VEmModel (const G4VEmModel &)=delete
 

Protected Member Functions

G4double MaxSecondaryEnergy (const G4ParticleDefinition *, G4double kinEnergy) final
 
void SetParticle (const G4ParticleDefinition *p)
 
- 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

const G4ParticleDefinition * particle
 
G4ParticleDefinition * theElectron
 
G4ParticleChangeForLoss * fParticleChange
 
G4bool isElectron
 
G4double twoln10
 
G4double lowLimit
 
- 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
 
size_t currentCoupleIndex = 0
 
size_t basedCoupleIndex = 0
 
G4bool lossFlucFlag = true
 

Detailed Description

Definition at line 62 of file G4MollerBhabhaModel.hh.

Constructor & Destructor Documentation

◆ G4MollerBhabhaModel() [1/2]

G4MollerBhabhaModel::G4MollerBhabhaModel ( const G4ParticleDefinition *  p = nullptr,
const G4String &  nam = "MollerBhabha" 
)
explicit

Definition at line 75 of file G4MollerBhabhaModel.cc.

77 : G4VEmModel(nam),
78 particle(nullptr),
79 isElectron(true),
80 twoln10(2.0*G4Log(10.0)),
81 lowLimit(0.02*keV),
82 isInitialised(false)
83{
84 theElectron = G4Electron::Electron();
85 if(nullptr != p) { SetParticle(p); }
86 fParticleChange = nullptr;
87}
G4Log
G4double G4Log(G4double x)
Definition: G4Log.hh:227
G4Electron::Electron
static G4Electron * Electron()
Definition: G4Electron.cc:93
G4MollerBhabhaModel::particle
const G4ParticleDefinition * particle
Definition: G4MollerBhabhaModel.hh:115
G4MollerBhabhaModel::SetParticle
void SetParticle(const G4ParticleDefinition *p)
Definition: G4MollerBhabhaModel.hh:131
G4MollerBhabhaModel::fParticleChange
G4ParticleChangeForLoss * fParticleChange
Definition: G4MollerBhabhaModel.hh:117
G4MollerBhabhaModel::theElectron
G4ParticleDefinition * theElectron
Definition: G4MollerBhabhaModel.hh:116

◆ ~G4MollerBhabhaModel()

G4MollerBhabhaModel::~G4MollerBhabhaModel ( )
overridedefault

◆ G4MollerBhabhaModel() [2/2]

G4MollerBhabhaModel::G4MollerBhabhaModel ( const G4MollerBhabhaModel &  )
delete

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

G4double G4MollerBhabhaModel::ComputeCrossSectionPerAtom ( const G4ParticleDefinition *  p,
G4double  kineticEnergy,
G4double  Z,
G4double  A,
G4double  cutEnergy,
G4double  maxEnergy 
)
overridevirtual

Reimplemented from G4VEmModel.

Definition at line 174 of file G4MollerBhabhaModel.cc.

180{
181 return Z*ComputeCrossSectionPerElectron(p,kineticEnergy,cutEnergy,maxEnergy);
182}
Z
const G4int Z[17]
Definition: G4WaterStopping.cc:51
G4MollerBhabhaModel::ComputeCrossSectionPerElectron
virtual G4double ComputeCrossSectionPerElectron(const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy, G4double maxEnergy)
Definition: G4MollerBhabhaModel.cc:121

◆ ComputeCrossSectionPerElectron()

G4double G4MollerBhabhaModel::ComputeCrossSectionPerElectron ( const G4ParticleDefinition *  p,
G4double  kineticEnergy,
G4double  cutEnergy,
G4double  maxEnergy 
)
virtual

Reimplemented in G4PolarizedIonisationModel.

Definition at line 121 of file G4MollerBhabhaModel.cc.

124{
125 if(p != particle) { SetParticle(p); }
126
127 G4double cross = 0.0;
128 G4double tmax = MaxSecondaryEnergy(p, kineticEnergy);
129 tmax = std::min(maxEnergy, tmax);
130 //G4cout << "E= " << kineticEnergy << " cut= " << cutEnergy
131 // << " Emax= " << tmax << G4endl;
132 if(cutEnergy < tmax) {
133
134 G4double xmin = cutEnergy/kineticEnergy;
135 G4double xmax = tmax/kineticEnergy;
136 G4double tau = kineticEnergy/electron_mass_c2;
137 G4double gam = tau + 1.0;
138 G4double gamma2= gam*gam;
139 G4double beta2 = tau*(tau + 2)/gamma2;
140
141 //Moller (e-e-) scattering
142 if (isElectron) {
143
144 G4double gg = (2.0*gam - 1.0)/gamma2;
145 cross = ((xmax - xmin)*(1.0 - gg + 1.0/(xmin*xmax)
146 + 1.0/((1.0-xmin)*(1.0 - xmax)))
147 - gg*G4Log( xmax*(1.0 - xmin)/(xmin*(1.0 - xmax)) ) ) / beta2;
148
149 //Bhabha (e+e-) scattering
150 } else {
151
152 G4double y = 1.0/(1.0 + gam);
153 G4double y2 = y*y;
154 G4double y12 = 1.0 - 2.0*y;
155 G4double b1 = 2.0 - y2;
156 G4double b2 = y12*(3.0 + y2);
157 G4double y122= y12*y12;
158 G4double b4 = y122*y12;
159 G4double b3 = b4 + y122;
160
161 cross = (xmax - xmin)*(1.0/(beta2*xmin*xmax) + b2
162 - 0.5*b3*(xmin + xmax)
163 + b4*(xmin*xmin + xmin*xmax + xmax*xmax)/3.0)
164 - b1*G4Log(xmax/xmin);
165 }
166
167 cross *= twopi_mc2_rcl2/kineticEnergy;
168 }
169 return cross;
170}
G4double
double G4double
Definition: G4Types.hh:83
G4MollerBhabhaModel::MaxSecondaryEnergy
G4double MaxSecondaryEnergy(const G4ParticleDefinition *, G4double kinEnergy) final
Definition: G4MollerBhabhaModel.cc:95

Referenced by ComputeCrossSectionPerAtom(), G4PolarizedIonisationModel::ComputeCrossSectionPerElectron(), and CrossSectionPerVolume().

◆ ComputeDEDXPerVolume()

G4double G4MollerBhabhaModel::ComputeDEDXPerVolume ( const G4Material *  material,
const G4ParticleDefinition *  p,
G4double  kineticEnergy,
G4double  cutEnergy 
)
overridevirtual

Reimplemented from G4VEmModel.

Definition at line 199 of file G4MollerBhabhaModel.cc.

204{
205 if(p != particle) { SetParticle(p); }
206 // calculate the dE/dx due to the ionization by Seltzer-Berger formula
207 // checl low-energy limit
208 G4double electronDensity = material->GetElectronDensity();
209
210 G4double Zeff = material->GetIonisation()->GetZeffective();
211 G4double th = 0.25*sqrt(Zeff)*keV;
212 G4double tkin = std::max(kineticEnergy, th);
213
214 G4double tau = tkin/electron_mass_c2;
215 G4double gam = tau + 1.0;
216 G4double gamma2= gam*gam;
217 G4double bg2 = tau*(tau + 2);
218 G4double beta2 = bg2/gamma2;
219
220 G4double eexc = material->GetIonisation()->GetMeanExcitationEnergy();
221 eexc /= electron_mass_c2;
222 G4double eexc2 = eexc*eexc;
223
224 G4double d = std::min(cut, MaxSecondaryEnergy(p, tkin))/electron_mass_c2;
225 G4double dedx;
226
227 // electron
228 if (isElectron) {
229
230 dedx = G4Log(2.0*(tau + 2.0)/eexc2) - 1.0 - beta2
231 + G4Log((tau-d)*d) + tau/(tau-d)
232 + (0.5*d*d + (2.0*tau + 1.)*G4Log(1. - d/tau))/gamma2;
233
234 //positron
235 } else {
236
237 G4double d2 = d*d*0.5;
238 G4double d3 = d2*d/1.5;
239 G4double d4 = d3*d*0.75;
240 G4double y = 1.0/(1.0 + gam);
241 dedx = G4Log(2.0*(tau + 2.0)/eexc2) + G4Log(tau*d)
242 - beta2*(tau + 2.0*d - y*(3.0*d2
243 + y*(d - d3 + y*(d2 - tau*d3 + d4))))/tau;
244 }
245
246 //density correction
247 G4double x = G4Log(bg2)/twoln10;
248 dedx -= material->GetIonisation()->DensityCorrection(x);
249
250 // now you can compute the total ionization loss
251 dedx *= twopi_mc2_rcl2*electronDensity/beta2;
252 if (dedx < 0.0) { dedx = 0.0; }
253
254 // lowenergy extrapolation
255
256 if (kineticEnergy < th) {
257 x = kineticEnergy/th;
258 if(x > 0.25) { dedx /= sqrt(x); }
259 else { dedx *= 1.4*sqrt(x)/(0.1 + x); }
260 }
261 return dedx;
262}
G4IonisParamMat::DensityCorrection
G4double DensityCorrection(G4double x) const
Definition: G4IonisParamMat.hh:110
G4IonisParamMat::GetMeanExcitationEnergy
G4double GetMeanExcitationEnergy() const
Definition: G4IonisParamMat.hh:66
G4IonisParamMat::GetZeffective
G4double GetZeffective() const
Definition: G4IonisParamMat.hh:139
G4Material::GetIonisation
G4IonisParamMat * GetIonisation() const
Definition: G4Material.hh:221
G4Material::GetElectronDensity
G4double GetElectronDensity() const
Definition: G4Material.hh:212

◆ CrossSectionPerVolume()

G4double G4MollerBhabhaModel::CrossSectionPerVolume ( const G4Material *  material,
const G4ParticleDefinition *  p,
G4double  kineticEnergy,
G4double  cutEnergy,
G4double  maxEnergy 
)
overridevirtual

Reimplemented from G4VEmModel.

Definition at line 186 of file G4MollerBhabhaModel.cc.

192{
193 G4double eDensity = material->GetElectronDensity();
194 return eDensity*ComputeCrossSectionPerElectron(p,kinEnergy,cutEnergy,maxEnergy);
195}

◆ Initialise()

void G4MollerBhabhaModel::Initialise ( const G4ParticleDefinition *  p,
const G4DataVector &   
)
overridevirtual

Implements G4VEmModel.

Definition at line 105 of file G4MollerBhabhaModel.cc.

107{
108 if(p != particle) { SetParticle(p); }
109
110 if(isInitialised) { return; }
111
112 isInitialised = true;
113 fParticleChange = GetParticleChangeForLoss();
114 if(UseAngularGeneratorFlag() && !GetAngularDistribution()) {
115 SetAngularDistribution(new G4DeltaAngle());
116 }
117}
G4VEmModel::GetAngularDistribution
G4VEmAngularDistribution * GetAngularDistribution()
Definition: G4VEmModel.hh:600
G4VEmModel::SetAngularDistribution
void SetAngularDistribution(G4VEmAngularDistribution *)
Definition: G4VEmModel.hh:607
G4VEmModel::UseAngularGeneratorFlag
G4bool UseAngularGeneratorFlag() const
Definition: G4VEmModel.hh:697
G4VEmModel::GetParticleChangeForLoss
G4ParticleChangeForLoss * GetParticleChangeForLoss()
Definition: G4VEmModel.cc:109

◆ MaxSecondaryEnergy()

G4double G4MollerBhabhaModel::MaxSecondaryEnergy ( const G4ParticleDefinition *  ,
G4double  kinEnergy 
)
finalprotectedvirtual

Reimplemented from G4VEmModel.

Definition at line 95 of file G4MollerBhabhaModel.cc.

97{
98 G4double tmax = kinEnergy;
99 if(isElectron) { tmax *= 0.5; }
100 return tmax;
101}

Referenced by G4PolarizedIonisationModel::ComputeCrossSectionPerElectron(), ComputeCrossSectionPerElectron(), and ComputeDEDXPerVolume().

◆ operator=()

G4MollerBhabhaModel & G4MollerBhabhaModel::operator= ( const G4MollerBhabhaModel &  right)
delete

◆ SampleSecondaries()

void G4MollerBhabhaModel::SampleSecondaries ( std::vector< G4DynamicParticle * > *  vdp,
const G4MaterialCutsCouple *  couple,
const G4DynamicParticle *  dp,
G4double  tmin,
G4double  maxEnergy 
)
overridevirtual

Implements G4VEmModel.

Definition at line 267 of file G4MollerBhabhaModel.cc.

272{
273 G4double kineticEnergy = dp->GetKineticEnergy();
274 //G4cout << "G4MollerBhabhaModel::SampleSecondaries: E= " << kineticEnergy
275 // << " in " << couple->GetMaterial()->GetName() << G4endl;
276 G4double tmax;
277 G4double tmin = cutEnergy;
278 if(isElectron) {
279 tmax = 0.5*kineticEnergy;
280 } else {
281 tmax = kineticEnergy;
282 }
283 if(maxEnergy < tmax) { tmax = maxEnergy; }
284 if(tmin >= tmax) { return; }
285
286 G4double energy = kineticEnergy + electron_mass_c2;
287 G4double xmin = tmin/kineticEnergy;
288 G4double xmax = tmax/kineticEnergy;
289 G4double gam = energy/electron_mass_c2;
290 G4double gamma2 = gam*gam;
291 G4double beta2 = 1.0 - 1.0/gamma2;
292 G4double x, z, grej;
293 CLHEP::HepRandomEngine* rndmEngine = G4Random::getTheEngine();
294 G4double rndm[2];
295
296 //Moller (e-e-) scattering
297 if (isElectron) {
298
299 G4double gg = (2.0*gam - 1.0)/gamma2;
300 G4double y = 1.0 - xmax;
301 grej = 1.0 - gg*xmax + xmax*xmax*(1.0 - gg + (1.0 - gg*y)/(y*y));
302
303 do {
304 rndmEngine->flatArray(2, rndm);
305 x = xmin*xmax/(xmin*(1.0 - rndm[0]) + xmax*rndm[0]);
306 y = 1.0 - x;
307 z = 1.0 - gg*x + x*x*(1.0 - gg + (1.0 - gg*y)/(y*y));
308 /*
309 if(z > grej) {
310 G4cout << "G4MollerBhabhaModel::SampleSecondary Warning! "
311 << "Majorant " << grej << " < "
312 << z << " for x= " << x
313 << " e-e- scattering"
314 << G4endl;
315 }
316 */
317 // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
318 } while(grej * rndm[1] > z);
319
320 //Bhabha (e+e-) scattering
321 } else {
322
323 G4double y = 1.0/(1.0 + gam);
324 G4double y2 = y*y;
325 G4double y12 = 1.0 - 2.0*y;
326 G4double b1 = 2.0 - y2;
327 G4double b2 = y12*(3.0 + y2);
328 G4double y122= y12*y12;
329 G4double b4 = y122*y12;
330 G4double b3 = b4 + y122;
331
332 y = xmax*xmax;
333 grej = 1.0 + (y*y*b4 - xmin*xmin*xmin*b3 + y*b2 - xmin*b1)*beta2;
334 do {
335 rndmEngine->flatArray(2, rndm);
336 x = xmin*xmax/(xmin*(1.0 - rndm[0]) + xmax*rndm[0]);
337 y = x*x;
338 z = 1.0 + (y*y*b4 - x*y*b3 + y*b2 - x*b1)*beta2;
339 /*
340 if(z > grej) {
341 G4cout << "G4MollerBhabhaModel::SampleSecondary Warning! "
342 << "Majorant " << grej << " < "
343 << z << " for x= " << x
344 << " e+e- scattering"
345 << G4endl;
346 }
347 */
348 // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
349 } while(grej * rndm[1] > z);
350 }
351
352 G4double deltaKinEnergy = x * kineticEnergy;
353
354 G4ThreeVector deltaDirection;
355
356 if(UseAngularGeneratorFlag()) {
357 const G4Material* mat = couple->GetMaterial();
358 G4int Z = SelectRandomAtomNumber(mat);
359
360 deltaDirection =
361 GetAngularDistribution()->SampleDirection(dp, deltaKinEnergy, Z, mat);
362
363 } else {
364
365 G4double deltaMomentum =
366 sqrt(deltaKinEnergy * (deltaKinEnergy + 2.0*electron_mass_c2));
367 G4double cost = deltaKinEnergy * (energy + electron_mass_c2) /
368 (deltaMomentum * dp->GetTotalMomentum());
369 if(cost > 1.0) { cost = 1.0; }
370 G4double sint = sqrt((1.0 - cost)*(1.0 + cost));
371
372 G4double phi = twopi * rndmEngine->flat() ;
373
374 deltaDirection.set(sint*cos(phi),sint*sin(phi), cost) ;
375 deltaDirection.rotateUz(dp->GetMomentumDirection());
376 }
377
378 // create G4DynamicParticle object for delta ray
379 auto delta = new G4DynamicParticle(theElectron,deltaDirection,deltaKinEnergy);
380 vdp->push_back(delta);
381
382 // primary change
383 kineticEnergy -= deltaKinEnergy;
384 G4ThreeVector finalP = dp->GetMomentum() - delta->GetMomentum();
385 finalP = finalP.unit();
386
387 fParticleChange->SetProposedKineticEnergy(kineticEnergy);
388 fParticleChange->SetProposedMomentumDirection(finalP);
389}
G4int
int G4int
Definition: G4Types.hh:85
CLHEP::Hep3Vector::unit
Hep3Vector unit() const
CLHEP::Hep3Vector::set
void set(double x, double y, double z)
CLHEP::Hep3Vector::rotateUz
Hep3Vector & rotateUz(const Hep3Vector &)
Definition: ThreeVector.cc:33
CLHEP::HepRandomEngine::flat
virtual double flat()=0
CLHEP::HepRandomEngine::flatArray
virtual void flatArray(const int size, double *vect)=0
G4DynamicParticle::GetMomentumDirection
const G4ThreeVector & GetMomentumDirection() const
G4DynamicParticle::GetKineticEnergy
G4double GetKineticEnergy() const
G4DynamicParticle::GetMomentum
G4ThreeVector GetMomentum() const
G4DynamicParticle::GetTotalMomentum
G4double GetTotalMomentum() const
G4MaterialCutsCouple::GetMaterial
const G4Material * GetMaterial() const
Definition: G4MaterialCutsCouple.hh:166
G4ParticleChangeForLoss::SetProposedKineticEnergy
void SetProposedKineticEnergy(G4double proposedKinEnergy)
Definition: G4ParticleChangeForLoss.hh:108
G4ParticleChangeForLoss::SetProposedMomentumDirection
void SetProposedMomentumDirection(const G4ThreeVector &dir)
Definition: G4ParticleChangeForLoss.hh:139
G4VEmAngularDistribution::SampleDirection
virtual G4ThreeVector & SampleDirection(const G4DynamicParticle *dp, G4double finalTotalEnergy, G4int Z, const G4Material *)=0
G4VEmModel::SelectRandomAtomNumber
G4int SelectRandomAtomNumber(const G4Material *) const
Definition: G4VEmModel.cc:253
G4INCL::KinematicsUtils::energy
G4double energy(const ThreeVector &p, const G4double m)
Definition: G4INCLKinematicsUtils.cc:158

◆ SetParticle()

void G4MollerBhabhaModel::SetParticle ( const G4ParticleDefinition *  p)
inlineprotected

Definition at line 131 of file G4MollerBhabhaModel.hh.

132{
133 particle = p;
134 isElectron = (p == theElectron);
135}

Referenced by ComputeCrossSectionPerElectron(), ComputeDEDXPerVolume(), G4MollerBhabhaModel(), and Initialise().

Member Data Documentation

◆ fParticleChange

G4ParticleChangeForLoss* G4MollerBhabhaModel::fParticleChange
protected

Definition at line 117 of file G4MollerBhabhaModel.hh.

Referenced by G4MollerBhabhaModel(), Initialise(), G4PolarizedIonisationModel::SampleSecondaries(), and SampleSecondaries().

◆ isElectron

G4bool G4MollerBhabhaModel::isElectron
protected

Definition at line 119 of file G4MollerBhabhaModel.hh.

Referenced by ComputeCrossSectionPerElectron(), ComputeDEDXPerVolume(), G4PolarizedIonisationModel::G4PolarizedIonisationModel(), MaxSecondaryEnergy(), G4PolarizedIonisationModel::SampleSecondaries(), SampleSecondaries(), and SetParticle().

◆ lowLimit

G4double G4MollerBhabhaModel::lowLimit
protected

Definition at line 121 of file G4MollerBhabhaModel.hh.

◆ particle

const G4ParticleDefinition* G4MollerBhabhaModel::particle
protected

Definition at line 115 of file G4MollerBhabhaModel.hh.

Referenced by ComputeCrossSectionPerElectron(), ComputeDEDXPerVolume(), Initialise(), and SetParticle().

◆ theElectron

G4ParticleDefinition* G4MollerBhabhaModel::theElectron
protected

Definition at line 116 of file G4MollerBhabhaModel.hh.

Referenced by G4MollerBhabhaModel(), G4PolarizedIonisationModel::G4PolarizedIonisationModel(), G4PolarizedIonisationModel::SampleSecondaries(), SampleSecondaries(), and SetParticle().

◆ twoln10

G4double G4MollerBhabhaModel::twoln10
protected

Definition at line 120 of file G4MollerBhabhaModel.hh.

Referenced by ComputeDEDXPerVolume().

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