Gabriele Cosmo
235 lines
7.3 KiB
C++
235 lines
7.3 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// $Id: G4MuPairProductionModel.hh 103220 2017-03-22 11:35:04Z gcosmo $
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//
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// -------------------------------------------------------------------
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//
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// GEANT4 Class header file
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//
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//
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// File name: G4MuPairProductionModel
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//
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// Author: Vladimir Ivanchenko on base of Laszlo Urban code
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//
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// Creation date: 18.05.2002
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//
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// Modifications:
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//
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// 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
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// 27-01-03 Make models region aware (V.Ivanchenko)
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// 13-02-03 Add name (V.Ivanchenko)
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// 10-02-04 Update parameterisation using R.Kokoulin model (V.Ivanchenko)
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// 10-02-04 Add lowestKinEnergy (V.Ivanchenko)
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// 13-02-06 Add ComputeCrossSectionPerAtom (mma)
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// 12-05-06 Add parameter to SelectRandomAtom (A.Bogdanov)
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// 11-10-07 Add ignoreCut flag (V.Ivanchenko)
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// 28-02-08 Reorganized protected methods and members (V.Ivanchenko)
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//
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// Class Description:
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//
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// Implementation of e+e- pair production by muons
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//
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// -------------------------------------------------------------------
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//
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#ifndef G4MuPairProductionModel_h
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#define G4MuPairProductionModel_h 1
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#include "G4VEmModel.hh"
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#include "G4NistManager.hh"
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#include "G4ElementData.hh"
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#include "G4Physics2DVector.hh"
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#include <vector>
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class G4Element;
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class G4ParticleChangeForLoss;
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class G4ParticleChangeForGamma;
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class G4MuPairProductionModel : public G4VEmModel
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{
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public:
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explicit G4MuPairProductionModel(const G4ParticleDefinition* p = nullptr,
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const G4String& nam = "muPairProd");
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virtual ~G4MuPairProductionModel();
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virtual void Initialise(const G4ParticleDefinition*,
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const G4DataVector&) override;
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virtual void InitialiseLocal(const G4ParticleDefinition*,
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G4VEmModel* masterModel) override;
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virtual G4double ComputeCrossSectionPerAtom(
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const G4ParticleDefinition*,
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G4double kineticEnergy,
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G4double Z, G4double A,
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G4double cutEnergy,
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G4double maxEnergy) override;
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virtual G4double ComputeDEDXPerVolume(const G4Material*,
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const G4ParticleDefinition*,
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G4double kineticEnergy,
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G4double cutEnergy) override;
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virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*,
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const G4MaterialCutsCouple*,
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const G4DynamicParticle*,
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G4double tmin,
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G4double maxEnergy) override;
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virtual G4double MinPrimaryEnergy(const G4Material*,
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const G4ParticleDefinition*,
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G4double) override;
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inline void SetLowestKineticEnergy(G4double e);
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inline void SetParticle(const G4ParticleDefinition*);
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protected:
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G4double ComputMuPairLoss(G4double Z, G4double tkin, G4double cut,
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G4double tmax);
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G4double ComputeMicroscopicCrossSection(G4double tkin,
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G4double Z,
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G4double cut);
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virtual G4double
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ComputeDMicroscopicCrossSection(G4double tkin, G4double Z,
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G4double pairEnergy);
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inline G4double MaxSecondaryEnergyForElement(G4double kineticEnergy,
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G4double Z);
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private:
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void MakeSamplingTables();
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void DataCorrupted(G4int Z, G4double logTkin);
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inline G4double FindScaledEnergy(G4int Z, G4double rand, G4double logTkin,
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G4double yymin, G4double yymax);
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// hide assignment operator
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G4MuPairProductionModel & operator=(const G4MuPairProductionModel &right) = delete;
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G4MuPairProductionModel(const G4MuPairProductionModel&) = delete;
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protected:
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const G4ParticleDefinition* particle;
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G4NistManager* nist;
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G4double factorForCross;
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G4double sqrte;
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G4double particleMass;
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G4double z13;
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G4double z23;
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G4double lnZ;
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G4int currentZ;
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static const G4double xgi[8],wgi[8];
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G4ParticleDefinition* theElectron;
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G4ParticleDefinition* thePositron;
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G4ParticleChangeForLoss* fParticleChange;
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G4double minPairEnergy;
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G4double lowestKinEnergy;
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G4int nzdat;
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// gamma energy bins
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G4int nYBinPerDecade;
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size_t nbiny;
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size_t nbine;
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G4double ymin;
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G4double dy;
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G4double emin;
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G4double emax;
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};
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline void G4MuPairProductionModel::SetLowestKineticEnergy(G4double e)
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{
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lowestKinEnergy = e;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline
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void G4MuPairProductionModel::SetParticle(const G4ParticleDefinition* p)
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{
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if(!particle) {
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particle = p;
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particleMass = particle->GetPDGMass();
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline G4double
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G4MuPairProductionModel::MaxSecondaryEnergyForElement(G4double kineticEnergy,
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G4double ZZ)
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{
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G4int Z = G4lrint(ZZ);
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if(Z != currentZ) {
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currentZ = Z;
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z13 = nist->GetZ13(Z);
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z23 = z13*z13;
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lnZ = nist->GetLOGZ(Z);
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}
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return kineticEnergy + particleMass*(1.0 - 0.75*sqrte*z13);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline G4double
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G4MuPairProductionModel::FindScaledEnergy(G4int Z, G4double rand,
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G4double logTkin,
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G4double yymin, G4double yymax)
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{
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G4double res = yymin;
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G4Physics2DVector* pv = fElementData->GetElement2DData(Z);
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if(!pv) {
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DataCorrupted(Z, logTkin);
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} else {
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G4double pmin = pv->Value(yymin, logTkin);
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G4double pmax = pv->Value(yymax, logTkin);
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G4double p0 = pv->Value(0.0, logTkin);
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if(p0 <= 0.0) { DataCorrupted(Z, logTkin); }
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else { res = pv->FindLinearX((pmin + rand*(pmax - pmin))/p0, logTkin); }
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}
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return res;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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#endif
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