Gabriele Cosmo
236 lines
7.4 KiB
C++
236 lines
7.4 KiB
C++
//
|
|
// ********************************************************************
|
|
// * License and Disclaimer *
|
|
// * *
|
|
// * The Geant4 software is copyright of the Copyright Holders of *
|
|
// * the Geant4 Collaboration. It is provided under the terms and *
|
|
// * conditions of the Geant4 Software License, included in the file *
|
|
// * LICENSE and available at http://cern.ch/geant4/license . These *
|
|
// * include a list of copyright holders. *
|
|
// * *
|
|
// * Neither the authors of this software system, nor their employing *
|
|
// * institutes,nor the agencies providing financial support for this *
|
|
// * work make any representation or warranty, express or implied, *
|
|
// * regarding this software system or assume any liability for its *
|
|
// * use. Please see the license in the file LICENSE and URL above *
|
|
// * for the full disclaimer and the limitation of liability. *
|
|
// * *
|
|
// * This code implementation is the result of the scientific and *
|
|
// * technical work of the GEANT4 collaboration. *
|
|
// * By using, copying, modifying or distributing the software (or *
|
|
// * any work based on the software) you agree to acknowledge its *
|
|
// * use in resulting scientific publications, and indicate your *
|
|
// * acceptance of all terms of the Geant4 Software license. *
|
|
// ********************************************************************
|
|
//
|
|
//
|
|
// -------------------------------------------------------------------
|
|
//
|
|
// GEANT4 Class header file
|
|
//
|
|
//
|
|
// File name: G4MuPairProductionModel
|
|
//
|
|
// Author: Vladimir Ivanchenko on base of Laszlo Urban code
|
|
//
|
|
// Creation date: 18.05.2002
|
|
//
|
|
// Modifications:
|
|
//
|
|
// 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
|
|
// 27-01-03 Make models region aware (V.Ivanchenko)
|
|
// 13-02-03 Add name (V.Ivanchenko)
|
|
// 10-02-04 Update parameterisation using R.Kokoulin model (V.Ivanchenko)
|
|
// 10-02-04 Add lowestKinEnergy (V.Ivanchenko)
|
|
// 13-02-06 Add ComputeCrossSectionPerAtom (mma)
|
|
// 12-05-06 Add parameter to SelectRandomAtom (A.Bogdanov)
|
|
// 11-10-07 Add ignoreCut flag (V.Ivanchenko)
|
|
// 28-02-08 Reorganized protected methods and members (V.Ivanchenko)
|
|
//
|
|
// Class Description:
|
|
//
|
|
// Implementation of e+e- pair production by muons
|
|
// A.G. Bogdanov et al., IEEE Trans. Nuc. Sci., Vol.53, No.2, 2006
|
|
//
|
|
// -------------------------------------------------------------------
|
|
//
|
|
|
|
#ifndef G4MuPairProductionModel_h
|
|
#define G4MuPairProductionModel_h 1
|
|
|
|
#include "G4VEmModel.hh"
|
|
#include "G4NistManager.hh"
|
|
#include "G4ElementData.hh"
|
|
#include "G4Physics2DVector.hh"
|
|
#include <vector>
|
|
|
|
class G4Element;
|
|
class G4ParticleChangeForLoss;
|
|
class G4ParticleChangeForGamma;
|
|
|
|
class G4MuPairProductionModel : public G4VEmModel
|
|
{
|
|
public:
|
|
|
|
explicit G4MuPairProductionModel(const G4ParticleDefinition* p = nullptr,
|
|
const G4String& nam = "muPairProd");
|
|
|
|
virtual ~G4MuPairProductionModel();
|
|
|
|
virtual void Initialise(const G4ParticleDefinition*,
|
|
const G4DataVector&) override;
|
|
|
|
virtual void InitialiseLocal(const G4ParticleDefinition*,
|
|
G4VEmModel* masterModel) override;
|
|
|
|
virtual G4double ComputeCrossSectionPerAtom(
|
|
const G4ParticleDefinition*,
|
|
G4double kineticEnergy,
|
|
G4double Z, G4double A,
|
|
G4double cutEnergy,
|
|
G4double maxEnergy) override;
|
|
|
|
virtual G4double ComputeDEDXPerVolume(const G4Material*,
|
|
const G4ParticleDefinition*,
|
|
G4double kineticEnergy,
|
|
G4double cutEnergy) override;
|
|
|
|
virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*,
|
|
const G4MaterialCutsCouple*,
|
|
const G4DynamicParticle*,
|
|
G4double tmin,
|
|
G4double maxEnergy) override;
|
|
|
|
virtual G4double MinPrimaryEnergy(const G4Material*,
|
|
const G4ParticleDefinition*,
|
|
G4double) override;
|
|
|
|
inline void SetLowestKineticEnergy(G4double e);
|
|
|
|
inline void SetParticle(const G4ParticleDefinition*);
|
|
|
|
// hide assignment operator and copy constructor
|
|
G4MuPairProductionModel & operator=
|
|
(const G4MuPairProductionModel &right) = delete;
|
|
G4MuPairProductionModel(const G4MuPairProductionModel&) = delete;
|
|
|
|
protected:
|
|
|
|
G4double ComputMuPairLoss(G4double Z, G4double tkin, G4double cut,
|
|
G4double tmax);
|
|
|
|
G4double ComputeMicroscopicCrossSection(G4double tkin,
|
|
G4double Z,
|
|
G4double cut);
|
|
|
|
virtual G4double
|
|
ComputeDMicroscopicCrossSection(G4double tkin, G4double Z,
|
|
G4double pairEnergy);
|
|
|
|
inline G4double MaxSecondaryEnergyForElement(G4double kineticEnergy,
|
|
G4double Z);
|
|
|
|
private:
|
|
|
|
void MakeSamplingTables();
|
|
|
|
void StoreTables() const;
|
|
|
|
G4bool RetrieveTables();
|
|
|
|
void DataCorrupted(G4int Z, G4double logTkin) const;
|
|
|
|
inline G4double FindScaledEnergy(G4int Z, G4double rand, G4double logTkin,
|
|
G4double yymin, G4double yymax);
|
|
|
|
protected:
|
|
|
|
const G4ParticleDefinition* particle;
|
|
G4NistManager* nist;
|
|
|
|
G4double factorForCross;
|
|
G4double sqrte;
|
|
G4double particleMass;
|
|
G4double z13;
|
|
G4double z23;
|
|
G4double lnZ;
|
|
G4int currentZ;
|
|
|
|
G4ParticleDefinition* theElectron;
|
|
G4ParticleDefinition* thePositron;
|
|
G4ParticleChangeForLoss* fParticleChange;
|
|
|
|
G4double minPairEnergy;
|
|
G4double lowestKinEnergy;
|
|
|
|
// gamma energy bins
|
|
G4int nYBinPerDecade;
|
|
size_t nbiny;
|
|
size_t nbine;
|
|
G4double ymin;
|
|
G4double dy;
|
|
G4double emin;
|
|
G4double emax;
|
|
|
|
G4bool fTableToFile;
|
|
};
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
|
|
|
|
inline void G4MuPairProductionModel::SetLowestKineticEnergy(G4double e)
|
|
{
|
|
lowestKinEnergy = e;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
|
|
|
|
inline
|
|
void G4MuPairProductionModel::SetParticle(const G4ParticleDefinition* p)
|
|
{
|
|
if(!particle) {
|
|
particle = p;
|
|
particleMass = particle->GetPDGMass();
|
|
}
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
|
|
|
|
inline G4double
|
|
G4MuPairProductionModel::MaxSecondaryEnergyForElement(G4double kineticEnergy,
|
|
G4double ZZ)
|
|
{
|
|
G4int Z = G4lrint(ZZ);
|
|
if(Z != currentZ) {
|
|
currentZ = Z;
|
|
z13 = nist->GetZ13(Z);
|
|
z23 = z13*z13;
|
|
lnZ = nist->GetLOGZ(Z);
|
|
}
|
|
return kineticEnergy + particleMass*(1.0 - 0.75*sqrte*z13);
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
|
|
|
|
inline G4double
|
|
G4MuPairProductionModel::FindScaledEnergy(G4int Z, G4double rand,
|
|
G4double logTkin,
|
|
G4double yymin, G4double yymax)
|
|
{
|
|
G4double res = yymin;
|
|
G4Physics2DVector* pv = fElementData->GetElement2DData(Z);
|
|
if(!pv) {
|
|
DataCorrupted(Z, logTkin);
|
|
} else {
|
|
G4double pmin = pv->Value(yymin, logTkin);
|
|
G4double pmax = pv->Value(yymax, logTkin);
|
|
G4double p0 = pv->Value(0.0, logTkin);
|
|
if(p0 <= 0.0) { DataCorrupted(Z, logTkin); }
|
|
else { res = pv->FindLinearX((pmin + rand*(pmax - pmin))/p0, logTkin); }
|
|
}
|
|
return res;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
|
|
|
|
#endif
|