Gabriele Cosmo
219 lines
7.2 KiB
C++
219 lines
7.2 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,v 1.20 2006/06/29 19:49:28 gunter Exp $
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// GEANT4 tag $Name: geant4-08-01 $
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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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//
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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 <vector>
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class G4Element;
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class G4ParticleChangeForLoss;
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class G4MuPairProductionModel : public G4VEmModel
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{
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public:
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G4MuPairProductionModel(const G4ParticleDefinition* p = 0,
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const G4String& nam = "MuPairProd");
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virtual ~G4MuPairProductionModel();
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void SetParticle(const G4ParticleDefinition*);
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void Initialise(const G4ParticleDefinition*, const G4DataVector&);
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void SetLowestKineticEnergy(G4double e) {lowestKinEnergy = e;};
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G4double MinEnergyCut(const G4ParticleDefinition*,
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const G4MaterialCutsCouple*);
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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);
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virtual G4double CrossSectionPerVolume(const G4Material*,
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const G4ParticleDefinition*,
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G4double kineticEnergy,
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G4double cutEnergy,
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G4double maxEnergy);
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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);
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std::vector<G4DynamicParticle*>* SampleSecondaries(
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const G4MaterialCutsCouple*,
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const G4DynamicParticle*,
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G4double tmin,
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G4double maxEnergy);
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protected:
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G4double MaxSecondaryEnergy(const G4ParticleDefinition*,
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G4double kineticEnergy);
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public:
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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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G4double ComputeDMicroscopicCrossSection(G4double tkin,
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G4double Z,
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G4double pairEnergy);
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private:
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const G4Element* SelectRandomAtom(G4double kinEnergy, G4double dt, G4int it,
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const G4MaterialCutsCouple* couple);
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void MakeSamplingTables();
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void SetCurrentElement(G4double Z);
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G4double InterpolatedIntegralCrossSection(G4double dt, G4double dz, G4int iz,
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G4int it, G4int iy, G4double z);
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// hide assignment operator
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G4MuPairProductionModel & operator=(const G4MuPairProductionModel &right);
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G4MuPairProductionModel(const G4MuPairProductionModel&);
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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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G4double factorForCross;
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G4double sqrte;
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G4double particleMass;
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G4double currentZ;
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G4double z13;
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G4double z23;
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G4double lnZ;
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const G4ParticleDefinition* particle;
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// tables for sampling
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G4int nzdat;
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G4int ntdat;
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G4int nbiny;
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size_t nmaxElements;
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static G4double zdat[5],adat[5],tdat[8],xgi[8],wgi[8];
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G4double ya[1001],proba[5][8][1001];
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G4double ymin;
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G4double ymax;
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G4double dy;
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G4bool samplingTablesAreFilled;
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std::vector<G4double> partialSum;
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};
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline G4double G4MuPairProductionModel::MaxSecondaryEnergy(
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const G4ParticleDefinition*,
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G4double kineticEnergy)
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{
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G4double maxPairEnergy = kineticEnergy + particleMass*(1.0 - 0.75*sqrte*z13);
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return maxPairEnergy;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline void G4MuPairProductionModel::SetCurrentElement(G4double Z)
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{
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if(Z != currentZ) {
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currentZ = Z;
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z13 = std::pow(Z,0.333333333);
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z23 = z13*z13;
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lnZ = std::log(Z);
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline G4double G4MuPairProductionModel::InterpolatedIntegralCrossSection(
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G4double dt, G4double dz,
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G4int iz, G4int it, G4int iy, G4double z)
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{
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G4double fac = 1./(zdat[iz] *(zdat[iz] +1.));
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G4double fac1 = 1./(zdat[iz-1]*(zdat[iz-1]+1.));
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G4double f0 = fac1*proba[iz-1][it-1][iy] +
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(fac*proba[iz][it-1][iy]-fac1*proba[iz-1][it-1][iy])*dz;
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G4double f1 = fac1*proba[iz-1][it ][iy] +
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(fac*proba[iz][it ][iy]-fac1*proba[iz-1][it ][iy])*dz;
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return (f0 + (f1-f0)*dt)*z*(z+1.);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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#endif
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