Geant4 11.4.0
Toolkit for the simulation of the passage of particles through matter
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G4BetheBlochModel Class Reference

#include <G4BetheBlochModel.hh>

Inheritance diagram for G4BetheBlochModel:

Public Member Functions

 G4BetheBlochModel (const G4ParticleDefinition *p=nullptr, const G4String &nam="BetheBloch")
 ~G4BetheBlochModel () override
void Initialise (const G4ParticleDefinition *, const G4DataVector &) override
G4double MinEnergyCut (const G4ParticleDefinition *, const G4MaterialCutsCouple *couple) 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
G4double GetChargeSquareRatio (const G4ParticleDefinition *p, const G4Material *mat, G4double kineticEnergy) override
G4double GetParticleCharge (const G4ParticleDefinition *p, const G4Material *mat, G4double kineticEnergy) override
void CorrectionsAlongStep (const G4Material *, const G4ParticleDefinition *, const G4double kinEnergy, const G4double cutEnergy, const G4double &length, G4double &eloss) override
void SampleSecondaries (std::vector< G4DynamicParticle * > *, const G4MaterialCutsCouple *, const G4DynamicParticle *, G4double tmin, G4double maxEnergy) override
void SetChargeSquareRatio (G4double val)
G4BetheBlochModel & operator= (const G4BetheBlochModel &right)=delete
 G4BetheBlochModel (const G4BetheBlochModel &)=delete
Public Member Functions inherited from G4VEmModel
 G4VEmModel (const G4String &nam)
virtual ~G4VEmModel ()
virtual void InitialiseLocal (const G4ParticleDefinition *, G4VEmModel *masterModel)
virtual void InitialiseForMaterial (const G4ParticleDefinition *, const G4Material *)
virtual void InitialiseForElement (const G4ParticleDefinition *, G4int Z)
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 void StartTracking (G4Track *)
virtual G4double Value (const G4MaterialCutsCouple *, const G4ParticleDefinition *, G4double kineticEnergy)
virtual G4double MinPrimaryEnergy (const G4Material *, const G4ParticleDefinition *, G4double cut=0.0)
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

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

Additional Inherited Members

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

Detailed Description

Definition at line 60 of file G4BetheBlochModel.hh.

Constructor & Destructor Documentation

◆ G4BetheBlochModel() [1/2]

G4BetheBlochModel::G4BetheBlochModel ( const G4ParticleDefinition * p = nullptr,
const G4String & nam = "BetheBloch" )
explicit

Definition at line 74 of file G4BetheBlochModel.cc.

76 : G4VEmModel(nam),
77 twoln10(2.0*G4Log(10.0)),
78 fAlphaTlimit(1*CLHEP::GeV),
79 fProtonTlimit(10*CLHEP::GeV)
80{
81 theElectron = G4Electron::Electron();
82 corr = G4LossTableManager::Instance()->EmCorrections();
83 nist = G4NistManager::Instance();
84 SetLowEnergyLimit(2.0*CLHEP::MeV);
85}
G4Log
G4double G4Log(G4double x)
Definition G4Log.hh:169
G4Electron::Electron
static G4Electron * Electron()
Definition G4Electron.cc:91
G4LossTableManager::Instance
static G4LossTableManager * Instance()
Definition G4LossTableManager.cc:90
G4LossTableManager::EmCorrections
G4EmCorrections * EmCorrections()
Definition G4LossTableManager.hh:389
G4NistManager::Instance
static G4NistManager * Instance()
Definition G4NistManager.cc:57
G4VEmModel::SetLowEnergyLimit
void SetLowEnergyLimit(G4double)
Definition G4VEmModel.hh:741
G4VEmModel::G4VEmModel
G4VEmModel(const G4String &nam)
Definition G4VEmModel.cc:67

Referenced by G4BetheBlochIonGasModel::G4BetheBlochIonGasModel(), G4BetheBlochModel(), G4BetheBlochNoDeltaModel::G4BetheBlochNoDeltaModel(), and operator=().

◆ ~G4BetheBlochModel()

G4BetheBlochModel::~G4BetheBlochModel ( )
overridedefault

◆ G4BetheBlochModel() [2/2]

G4BetheBlochModel::G4BetheBlochModel ( const G4BetheBlochModel & )
delete

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

G4double G4BetheBlochModel::ComputeCrossSectionPerAtom ( const G4ParticleDefinition * p,
G4double kineticEnergy,
G4double Z,
G4double A,
G4double cutEnergy,
G4double maxEnergy )
overridevirtual

Reimplemented from G4VEmModel.

Definition at line 217 of file G4BetheBlochModel.cc.

223{
224 return Z*ComputeCrossSectionPerElectron(p,kinEnergy,cutEnergy,maxEnergy);
225}
G4BetheBlochModel::ComputeCrossSectionPerElectron
virtual G4double ComputeCrossSectionPerElectron(const G4ParticleDefinition *, G4double kineticEnergy, G4double cutEnergy, G4double maxEnergy)
Definition G4BetheBlochModel.cc:185

◆ ComputeCrossSectionPerElectron()

G4double G4BetheBlochModel::ComputeCrossSectionPerElectron ( const G4ParticleDefinition * p,
G4double kineticEnergy,
G4double cutEnergy,
G4double maxEnergy )
virtual

Definition at line 185 of file G4BetheBlochModel.cc.

189{
190 G4double cross = 0.0;
191 const G4double tmax = MaxSecondaryEnergy(p, kineticEnergy);
192 const G4double cutEnergy = std::min(std::min(cut,tmax), tlimit);
193 const G4double maxEnergy = std::min(tmax, maxKinEnergy);
194 if(cutEnergy < maxEnergy) {
195
196 G4double totEnergy = kineticEnergy + mass;
197 G4double energy2 = totEnergy*totEnergy;
198 G4double beta2 = kineticEnergy*(kineticEnergy + 2.0*mass)/energy2;
199
200 cross = (maxEnergy - cutEnergy)/(cutEnergy*maxEnergy)
201 - beta2*G4Log(maxEnergy/cutEnergy)/tmax;
202
203 // +term for spin=1/2 particle
204 if( 0.0 < spin ) { cross += 0.5*(maxEnergy - cutEnergy)/energy2; }
205
206 cross *= CLHEP::twopi_mc2_rcl2*chargeSquareRatio/beta2;
207 }
208
209 // G4cout << "BB: e= " << kineticEnergy << " tmin= " << cutEnergy
210 // << " tmax= " << tmax << " cross= " << cross << G4endl;
211
212 return cross;
213}
G4double
double G4double
Definition G4Types.hh:83
G4BetheBlochModel::MaxSecondaryEnergy
G4double MaxSecondaryEnergy(const G4ParticleDefinition *, G4double kinEnergy) override
Definition G4BetheBlochModel.cc:481

Referenced by ComputeCrossSectionPerAtom(), and CrossSectionPerVolume().

◆ ComputeDEDXPerVolume()

G4double G4BetheBlochModel::ComputeDEDXPerVolume ( const G4Material * material,
const G4ParticleDefinition * p,
G4double kineticEnergy,
G4double cutEnergy )
overridevirtual

Reimplemented from G4VEmModel.

Reimplemented in G4BetheBlochNoDeltaModel.

Definition at line 244 of file G4BetheBlochModel.cc.

248{
249 const G4double tmax = MaxSecondaryEnergy(p, kineticEnergy);
250 // projectile formfactor limit energy loss
251 const G4double cutEnergy = std::min(std::min(cut,tmax), tlimit);
252 chargeSquareRatio = GetChargeSquareRatio(p, material, kineticEnergy);
253
254 G4double tau = kineticEnergy/mass;
255 G4double gam = tau + 1.0;
256 G4double bg2 = tau * (tau+2.0);
257 G4double beta2 = bg2/(gam*gam);
258 G4double xc = cutEnergy/tmax;
259
260 G4double eexc = material->GetIonisation()->GetMeanExcitationEnergy();
261 G4double eexc2 = eexc*eexc;
262
263 G4double eDensity = material->GetElectronDensity();
264
265 // added ICRU90 stopping data for limited list of materials
266 /*
267 G4cout << "### DEDX ICRI90:" << (nullptr != fICRU90)
268 << " Ekin=" << kineticEnergy
269 << " " << p->GetParticleName()
270 << " q2=" << chargeSquare
271 << " inside " << material->GetName() << G4endl;
272 */
273 if(nullptr != fICRU90 && kineticEnergy < fProtonTlimit) {
274 if(material != currentMaterial) {
275 currentMaterial = material;
276 baseMaterial = material->GetBaseMaterial()
277 ? material->GetBaseMaterial() : material;
278 iICRU90 = fICRU90->GetIndex(baseMaterial);
279 }
280 if(iICRU90 >= 0) {
281 G4double dedx = 0.0;
282 // only for alpha
283 if(isAlpha) {
284 if(kineticEnergy <= fAlphaTlimit) {
285 dedx = fICRU90->GetElectronicDEDXforAlpha(iICRU90, kineticEnergy);
286 } else {
287 const G4double e = kineticEnergy*CLHEP::proton_mass_c2/mass;
288 dedx = fICRU90->GetElectronicDEDXforProton(iICRU90, e)*chargeSquareRatio;
289 }
290 } else {
291 const G4double e = kineticEnergy*CLHEP::proton_mass_c2/mass;
292 dedx = fICRU90->GetElectronicDEDXforProton(iICRU90, e)*chargeSquareRatio;
293 }
294 dedx *= material->GetDensity();
295 if(cutEnergy < tmax) {
296 dedx += (G4Log(xc) + (1.0 - xc)*beta2)*CLHEP::twopi_mc2_rcl2
297 *(eDensity*chargeSquareRatio/beta2);
298 }
299 //G4cout << " iICRU90=" << iICRU90 << " dedx=" << dedx << G4endl;
300 if(dedx > 0.0) { return dedx; }
301 }
302 }
303 // general Bethe-Bloch formula
304 G4double dedx = G4Log(2.0*CLHEP::electron_mass_c2*bg2*cutEnergy/eexc2)
305 - (1.0 + xc)*beta2;
306
307 if(0.0 < spin) {
308 G4double del = 0.5*cutEnergy/(kineticEnergy + mass);
309 dedx += del*del;
310 }
311
312 // density correction
313 G4double x = G4Log(bg2)/twoln10;
314 dedx -= material->GetIonisation()->DensityCorrection(x);
315
316 // shell correction
317 dedx -= 2.0*corr->ShellCorrection(p,material,kineticEnergy);
318
319 // now compute the total ionization loss
320 dedx *= CLHEP::twopi_mc2_rcl2*chargeSquareRatio*eDensity/beta2;
321
322 //High order correction different for hadrons and ions
323 dedx += corr->HighOrderCorrections(p,material,kineticEnergy,cutEnergy);
324 dedx = std::max(dedx, 0.0);
325
326 /*
327 G4cout << "E(MeV)= " << kineticEnergy/CLHEP::MeV << " dedx= " << dedx
328 << " " << material->GetName() << G4endl;
329 */
330 return dedx;
331}
G4BetheBlochModel::GetChargeSquareRatio
G4double GetChargeSquareRatio(const G4ParticleDefinition *p, const G4Material *mat, G4double kineticEnergy) override
Definition G4BetheBlochModel.cc:129
G4IonisParamMat::DensityCorrection
G4double DensityCorrection(G4double x) const
Definition G4IonisParamMat.hh:92
G4IonisParamMat::GetMeanExcitationEnergy
G4double GetMeanExcitationEnergy() const
Definition G4IonisParamMat.hh:57
G4Material::GetDensity
G4double GetDensity() const
Definition G4Material.hh:174
G4Material::GetBaseMaterial
const G4Material * GetBaseMaterial() const
Definition G4Material.hh:218
G4Material::GetIonisation
G4IonisParamMat * GetIonisation() const
Definition G4Material.hh:212
G4Material::GetElectronDensity
G4double GetElectronDensity() const
Definition G4Material.hh:203
G4Material::GetIndex
std::size_t GetIndex() const
Definition G4Material.hh:239

Referenced by G4BetheBlochNoDeltaModel::ComputeDEDXPerVolume().

◆ CorrectionsAlongStep()

void G4BetheBlochModel::CorrectionsAlongStep ( const G4Material * mat,
const G4ParticleDefinition * p,
const G4double kinEnergy,
const G4double cutEnergy,
const G4double & length,
G4double & eloss )
overridevirtual

Reimplemented from G4VEmModel.

Definition at line 335 of file G4BetheBlochModel.cc.

341{
342 // no correction for alpha
343 if(isAlpha) { return; }
344
345 // no correction at the last step or at small step
346 if(eloss >= preKinEnergy || eloss < preKinEnergy*0.05) { return; }
347
348 // corrections for all charged particles with Q > 1
349 if(p != particle) { SetupParameters(p); }
350 if(!isIon) { return; }
351
352 // effective energy and charge at a step
353 const G4double e = std::max(preKinEnergy - eloss*0.5, preKinEnergy*0.5);
354 const G4double q2 = GetChargeSquareRatio(p, mat, e);
355 const G4double qfactor = q2/chargeSquareRatio;
356
357 /*
358 G4cout << "G4BetheBlochModel::CorrectionsAlongStep: Epre(MeV)="
359 << preKinEnergy << " Eeff(MeV)=" << e
360 << " eloss=" << eloss << " elossnew=" << eloss*qfactor
361 << " qfactor=" << qfactor << " Qpre=" << q20
362 << p->GetParticleName() <<G4endl;
363 */
364 eloss *= qfactor;
365}

◆ CrossSectionPerVolume()

G4double G4BetheBlochModel::CrossSectionPerVolume ( const G4Material * mat,
const G4ParticleDefinition * p,
G4double kineticEnergy,
G4double cutEnergy,
G4double maxEnergy )
overridevirtual

Reimplemented from G4VEmModel.

Reimplemented in G4BetheBlochNoDeltaModel.

Definition at line 229 of file G4BetheBlochModel.cc.

235{
236 chargeSquareRatio = GetChargeSquareRatio(p, mat, kinEnergy);
237 G4double sigma = mat->GetElectronDensity()
238 *ComputeCrossSectionPerElectron(p,kinEnergy,cutEnergy,maxEnergy);
239 return sigma;
240}

◆ GetChargeSquareRatio()

G4double G4BetheBlochModel::GetChargeSquareRatio ( const G4ParticleDefinition * p,
const G4Material * mat,
G4double kineticEnergy )
overridevirtual

Reimplemented from G4VEmModel.

Definition at line 129 of file G4BetheBlochModel.cc.

132{
133 // this method is called only for ions, so no check if it is an ion
134 chargeSquareRatio = corr->EffectiveChargeSquareRatio(p, mat, kinEnergy);
135 return chargeSquareRatio;
136}

Referenced by ComputeDEDXPerVolume(), CorrectionsAlongStep(), and CrossSectionPerVolume().

◆ GetParticleCharge()

G4double G4BetheBlochModel::GetParticleCharge ( const G4ParticleDefinition * p,
const G4Material * mat,
G4double kineticEnergy )
overridevirtual

Reimplemented from G4VEmModel.

Definition at line 140 of file G4BetheBlochModel.cc.

143{
144 // this method is called only for ions, so no check if it is an ion
145 return corr->GetParticleCharge(p, mat, kineticEnergy);
146}

◆ Initialise()

void G4BetheBlochModel::Initialise ( const G4ParticleDefinition * p,
const G4DataVector &  )
overridevirtual

Implements G4VEmModel.

Definition at line 93 of file G4BetheBlochModel.cc.

95{
96 if(p != particle) { SetupParameters(p); }
97
98 // always false before the run
99 SetDeexcitationFlag(false);
100
101 // initialisation once
102 if(nullptr == fParticleChange) {
103 const G4String& pname = particle->GetParticleName();
104 if(G4EmParameters::Instance()->UseICRU90Data() &&
105 (pname == "proton" || pname == "GenericIon" || pname == "alpha")) {
106 fICRU90 = nist->GetICRU90StoppingData();
107 }
108 if (pname == "GenericIon") {
109 isIon = true;
110 } else if (pname == "alpha") {
111 isAlpha = true;
112 } else if (particle->GetPDGCharge() > 1.1*CLHEP::eplus) {
113 isIon = true;
114 }
115
116 fParticleChange = GetParticleChangeForLoss();
117 if(UseAngularGeneratorFlag() && nullptr == GetAngularDistribution()) {
118 SetAngularDistribution(new G4DeltaAngle());
119 }
120 }
121 // initialisation for each new run
122 if(IsMaster() && nullptr != fICRU90) {
123 fICRU90->Initialise();
124 }
125}
G4EmParameters::Instance
static G4EmParameters * Instance()
Definition G4EmParameters.cc:71
G4VEmModel::GetAngularDistribution
G4VEmAngularDistribution * GetAngularDistribution()
Definition G4VEmModel.hh:602
G4VEmModel::IsMaster
G4bool IsMaster() const
Definition G4VEmModel.hh:713
G4VEmModel::SetDeexcitationFlag
void SetDeexcitationFlag(G4bool val)
Definition G4VEmModel.hh:783
G4VEmModel::SetAngularDistribution
void SetAngularDistribution(G4VEmAngularDistribution *)
Definition G4VEmModel.hh:609
G4VEmModel::UseAngularGeneratorFlag
G4bool UseAngularGeneratorFlag() const
Definition G4VEmModel.hh:692
G4VEmModel::GetParticleChangeForLoss
G4ParticleChangeForLoss * GetParticleChangeForLoss()
Definition G4VEmModel.cc:107

◆ MaxSecondaryEnergy()

G4double G4BetheBlochModel::MaxSecondaryEnergy ( const G4ParticleDefinition * pd,
G4double kinEnergy )
overrideprotectedvirtual

Reimplemented from G4VEmModel.

Definition at line 481 of file G4BetheBlochModel.cc.

483{
484 // here particle type is checked for the case,
485 // when this model is shared between particles
486 if(pd != particle) { SetupParameters(pd); }
487 G4double tau = kinEnergy/mass;
488 return 2.0*CLHEP::electron_mass_c2*tau*(tau + 2.) /
489 (1. + 2.0*(tau + 1.)*ratio + ratio*ratio);
490}

Referenced by ComputeCrossSectionPerElectron(), ComputeDEDXPerVolume(), and SampleSecondaries().

◆ MinEnergyCut()

G4double G4BetheBlochModel::MinEnergyCut ( const G4ParticleDefinition * ,
const G4MaterialCutsCouple * couple )
overridevirtual

Reimplemented from G4VEmModel.

Definition at line 176 of file G4BetheBlochModel.cc.

178{
179 return couple->GetMaterial()->GetIonisation()->GetMeanExcitationEnergy();
180}
G4MaterialCutsCouple::GetMaterial
const G4Material * GetMaterial() const
Definition G4MaterialCutsCouple.hh:166

◆ operator=()

G4BetheBlochModel & G4BetheBlochModel::operator= ( const G4BetheBlochModel & right)
delete

◆ SampleSecondaries()

void G4BetheBlochModel::SampleSecondaries ( std::vector< G4DynamicParticle * > * vdp,
const G4MaterialCutsCouple * couple,
const G4DynamicParticle * dp,
G4double tmin,
G4double maxEnergy )
overridevirtual

Implements G4VEmModel.

Definition at line 369 of file G4BetheBlochModel.cc.

374{
375 G4double kinEnergy = dp->GetKineticEnergy();
376 const G4double tmax = MaxSecondaryEnergy(dp->GetDefinition(), kinEnergy);
377 const G4double minKinEnergy = std::min(cut, tmax);
378 const G4double maxKinEnergy = std::min(maxEnergy, tmax);
379 if(minKinEnergy >= maxKinEnergy) { return; }
380
381 //G4cout << "G4BetheBlochModel::SampleSecondaries Emin= " << minKinEnergy
382 // << " Emax= " << maxKinEnergy << G4endl;
383
384 const G4double totEnergy = kinEnergy + mass;
385 const G4double etot2 = totEnergy*totEnergy;
386 const G4double beta2 = kinEnergy*(kinEnergy + 2.0*mass)/etot2;
387
388 G4double deltaKinEnergy, f;
389 G4double f1 = 0.0;
390 G4double fmax = 1.0;
391 if( 0.0 < spin ) { fmax += 0.5*maxKinEnergy*maxKinEnergy/etot2; }
392
393 CLHEP::HepRandomEngine* rndmEngineMod = G4Random::getTheEngine();
394 G4double rndm[2];
395
396 // sampling without nuclear size effect
397 do {
398 rndmEngineMod->flatArray(2, rndm);
399 deltaKinEnergy = minKinEnergy*maxKinEnergy
400 /(minKinEnergy*(1.0 - rndm[0]) + maxKinEnergy*rndm[0]);
401
402 f = 1.0 - beta2*deltaKinEnergy/tmax;
403 if( 0.0 < spin ) {
404 f1 = 0.5*deltaKinEnergy*deltaKinEnergy/etot2;
405 f += f1;
406 }
407
408 // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
409 } while( fmax*rndm[1] > f);
410
411 // projectile formfactor - suppresion of high energy
412 // delta-electron production at high energy
413
414 G4double x = formfact*deltaKinEnergy;
415 if(x > 1.e-6) {
416
417 G4double x1 = 1.0 + x;
418 G4double grej = 1.0/(x1*x1);
419 if( 0.0 < spin ) {
420 G4double x2 = 0.5*electron_mass_c2*deltaKinEnergy/(mass*mass);
421 grej *= (1.0 + magMoment2*(x2 - f1/f)/(1.0 + x2));
422 }
423 if(grej > 1.1) {
424 G4cout << "### G4BetheBlochModel WARNING: grej= " << grej
425 << " " << dp->GetDefinition()->GetParticleName()
426 << " Ekin(MeV)= " << kinEnergy
427 << " delEkin(MeV)= " << deltaKinEnergy
428 << G4endl;
429 }
430 if(rndmEngineMod->flat() > grej) { return; }
431 }
432
433 G4ThreeVector deltaDirection;
434
435 if(UseAngularGeneratorFlag()) {
436 const G4Material* mat = couple->GetMaterial();
437 deltaDirection =
438 GetAngularDistribution()->SampleDirection(dp, deltaKinEnergy,
439 SelectRandomAtomNumber(mat),
440 mat);
441 } else {
442
443 G4double deltaMomentum =
444 std::sqrt(deltaKinEnergy * (deltaKinEnergy + 2.0*electron_mass_c2));
445 G4double cost = deltaKinEnergy * (totEnergy + electron_mass_c2) /
446 (deltaMomentum * dp->GetTotalMomentum());
447 cost = std::min(cost, 1.0);
448 const G4double sint = std::sqrt((1.0 - cost)*(1.0 + cost));
449 const G4double phi = twopi*rndmEngineMod->flat();
450
451 deltaDirection.set(sint*std::cos(phi),sint*std::sin(phi), cost) ;
452 deltaDirection.rotateUz(dp->GetMomentumDirection());
453 }
454 /*
455 G4cout << "### G4BetheBlochModel "
456 << dp->GetDefinition()->GetParticleName()
457 << " Ekin(MeV)= " << kinEnergy
458 << " delEkin(MeV)= " << deltaKinEnergy
459 << " tmin(MeV)= " << minKinEnergy
460 << " tmax(MeV)= " << maxKinEnergy
461 << " dir= " << dp->GetMomentumDirection()
462 << " dirDelta= " << deltaDirection
463 << G4endl;
464 */
465 // create G4DynamicParticle object for delta ray
466 auto delta = new G4DynamicParticle(theElectron,deltaDirection,deltaKinEnergy);
467
468 vdp->push_back(delta);
469
470 // Change kinematics of primary particle
471 kinEnergy -= deltaKinEnergy;
472 G4ThreeVector finalP = dp->GetMomentum() - delta->GetMomentum();
473 finalP = finalP.unit();
474
475 fParticleChange->SetProposedKineticEnergy(kinEnergy);
476 fParticleChange->SetProposedMomentumDirection(finalP);
477}
G4ThreeVector
CLHEP::Hep3Vector G4ThreeVector
Definition G4ThreeVector.hh:36
G4endl
#define G4endl
Definition G4ios.hh:67
G4cout
G4GLOB_DLL std::ostream G4cout
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::GetDefinition
G4ParticleDefinition * GetDefinition() const
G4DynamicParticle::GetKineticEnergy
G4double GetKineticEnergy() const
G4DynamicParticle::GetMomentum
G4ThreeVector GetMomentum() const
G4DynamicParticle::GetTotalMomentum
G4double GetTotalMomentum() const
G4ParticleDefinition::GetParticleName
const G4String & GetParticleName() const
Definition G4ParticleDefinition.hh:96
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:250

◆ SetChargeSquareRatio()

void G4BetheBlochModel::SetChargeSquareRatio ( G4double val)
inline

Definition at line 162 of file G4BetheBlochModel.hh.

163{
164 chargeSquareRatio = val;
165}

Referenced by G4BetheBlochIonGasModel::ChargeSquareRatio().

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