Gabriele Cosmo
172 lines
6.0 KiB
C++
172 lines
6.0 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: G4eCoulombScatteringModel.hh,v 1.5 2006/10/19 09:44:27 vnivanch Exp $
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// GEANT4 tag $Name: geant4-08-02 $
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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: G4eCoulombScatteringModel
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//
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// Author: Vladimir Ivanchenko
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//
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// Creation date: 19.02.2006
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//
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// Modifications:
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// 01.08.06 V.Ivanchenko extend upper limit of table to TeV and review the
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// logic of building - only elements from G4ElementTable
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// 08.08.06 V.Ivanchenko build internal table in ekin scale, introduce faclim
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// 19.08.06 V.Ivanchenko add inline function ScreeningParameter and
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// make some members protected
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//
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// Class Description:
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//
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// Implementation of eCoulombScattering of pointlike charge particle
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// on Atomic Nucleus for interval of scattering anles in Lab system
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// thetaMin - ThetaMax, nucleus recoil is neglected.
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// The model based on analysis of J.M.Fernandez-Varea et al.
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// NIM B73(1993)447 originated from G.Wentzel Z.Phys. 40(1927)590 with
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// screening parameter from H.A.Bethe Phys. Rev. 89 (1953) 1256.
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//
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// -------------------------------------------------------------------
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//
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#ifndef G4eCoulombScatteringModel_h
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#define G4eCoulombScatteringModel_h 1
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#include "G4VEmModel.hh"
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#include "G4PhysicsTable.hh"
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#include "globals.hh"
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class G4ParticleChangeForGamma;
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class G4eCoulombScatteringModel : public G4VEmModel
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{
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public:
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G4eCoulombScatteringModel(G4double thetaMin = 0.0, G4double thetaMax = pi,
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G4bool build = true, G4double tlim = TeV*TeV,
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const G4String& nam = "eCoulombScattering");
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virtual ~G4eCoulombScatteringModel();
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virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&);
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virtual G4double ComputeCrossSectionPerAtom(
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const G4ParticleDefinition*,
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G4double kinEnergy,
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G4double Z,
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G4double A,
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G4double cut,
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G4double emax);
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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 ScreeningParameter(G4double Z, G4double q2,
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G4double mom2, G4double invbeta2);
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private:
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G4double CalculateCrossSectionPerAtom(const G4ParticleDefinition*,
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G4double kinEnergy,
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G4double Z);
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// hide assignment operator
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G4eCoulombScatteringModel & operator=(const G4eCoulombScatteringModel &right);
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G4eCoulombScatteringModel(const G4eCoulombScatteringModel&);
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protected:
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G4ParticleChangeForGamma* fParticleChange;
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G4double coeff;
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G4double cosThetaMin;
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G4double cosThetaMax;
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G4double q2Limit;
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private:
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G4PhysicsTable* theCrossSectionTable;
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G4double a0;
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G4double lowKEnergy;
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G4double highKEnergy;
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G4double alpha2;
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G4double faclim;
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G4int nbins;
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G4int nmax;
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G4int index[100];
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G4bool buildTable;
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G4bool isInitialised;
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};
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline G4double G4eCoulombScatteringModel::ComputeCrossSectionPerAtom(
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const G4ParticleDefinition* p,
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G4double kinEnergy,
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G4double Z, G4double,
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G4double, G4double)
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{
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G4double x;
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G4bool b;
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if(theCrossSectionTable) {
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x = std::exp((((*theCrossSectionTable)[index[G4int(Z)]]))
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->GetValue(kinEnergy, b));
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} else x = CalculateCrossSectionPerAtom(p, kinEnergy, Z);
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// G4cout << "G4eCoulombScatteringModel: e= " << kinEnergy
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// << " cs= " << x << G4endl;
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return x;
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}
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inline G4double G4eCoulombScatteringModel::ScreeningParameter(
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G4double Z,
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G4double q2,
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G4double mom2,
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G4double invbeta2)
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{
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G4double a = invbeta2*Z*Z*q2*alpha2;
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return std::pow(Z,0.6666667)*a0*(1.13 + 3.76*a)/mom2;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#endif
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