Gabriele Cosmo
154 lines
5.0 KiB
C++
154 lines
5.0 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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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. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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// $Id: G4BetheBlochModel.hh,v 1.5 2005/05/12 11:06:42 vnivanch Exp $
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// GEANT4 tag $Name: geant4-08-00 $
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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: G4BetheBlochModel
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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: 03.01.2002
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//
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// Modifications:
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//
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// 23-12-02 V.Ivanchenko change interface in order to moveto cut per region
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// 24-01-03 Make models region aware (V.Ivanchenko)
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// 13-02-03 Add name (V.Ivanchenko)
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// 12-11-03 Fix for GenericIons (V.Ivanchenko)
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// 24-03-05 Add G4EmCorrections (V.Ivanchenko)
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// 11-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
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// 11-04-04 Move MaxSecondaryEnergy to models (V.Ivanchenko)
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//
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// Class Description:
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//
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// Implementation of Bethe-Bloch model of energy loss and
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// delta-electron production by heavy charged particles
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// -------------------------------------------------------------------
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//
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#ifndef G4BetheBlochModel_h
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#define G4BetheBlochModel_h 1
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#include "G4VEmModel.hh"
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class G4EmCorrections;
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class G4ParticleChangeForLoss;
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class G4BetheBlochModel : public G4VEmModel
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{
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public:
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G4BetheBlochModel(const G4ParticleDefinition* p = 0, const G4String& nam = "BetheBloch");
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virtual ~G4BetheBlochModel();
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virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&);
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G4double MinEnergyCut(const G4ParticleDefinition*,
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const G4MaterialCutsCouple*);
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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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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 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 kinEnergy);
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private:
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void SetParticle(const G4ParticleDefinition* p);
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// hide assignment operator
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G4BetheBlochModel & operator=(const G4BetheBlochModel &right);
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G4BetheBlochModel(const G4BetheBlochModel&);
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const G4ParticleDefinition* particle;
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G4ParticleDefinition* theElectron;
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G4EmCorrections* corr;
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G4ParticleChangeForLoss* fParticleChange;
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G4double mass;
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G4double tlimit;
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G4double spin;
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G4double chargeSquare;
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G4double ratio;
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G4double twoln10;
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G4double bg2lim;
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G4double taulim;
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G4bool isIon;
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};
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4double G4BetheBlochModel::MaxSecondaryEnergy(
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const G4ParticleDefinition* pd,
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G4double kinEnergy)
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{
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if(isIon) SetParticle(pd);
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G4double tau = kinEnergy/mass;
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G4double tmax = 2.0*electron_mass_c2*tau*(tau + 2.) /
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(1. + 2.0*(tau + 1.)*ratio + ratio*ratio);
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return std::min(tmax,tlimit);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline void G4BetheBlochModel::SetParticle(const G4ParticleDefinition* p)
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{
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if(particle != p) {
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particle = p;
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mass = particle->GetPDGMass();
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spin = particle->GetPDGSpin();
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G4double q = particle->GetPDGCharge()/eplus;
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chargeSquare = q*q;
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ratio = electron_mass_c2/mass;
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tlimit = 51.2*GeV*std::pow(proton_mass_c2/mass,0.66667);
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#endif
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