Gabriele Cosmo
229 lines
7.5 KiB
C++
229 lines
7.5 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 1.20 2007/10/24 10:42:05 vnivanch Exp $
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// GEANT4 tag $Name: geant4-09-01 $
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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: 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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// 09.10.07 V.Ivanchenko reorganized methods, add cut dependence in scattering off e-
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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 "G4NistManager.hh"
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#include "globals.hh"
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class G4ParticleChangeForGamma;
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class G4ParticleDefinition;
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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 = false, 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 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);
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protected:
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G4double ComputeElectronXSectionPerAtom(
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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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virtual G4double CalculateCrossSectionPerAtom(
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const G4ParticleDefinition*,
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G4double kinEnergy,
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G4double Z, G4double A);
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inline void SetupParticle(const G4ParticleDefinition*);
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inline void SetupKinematic(G4double kinEnergy);
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inline void SetupTarget(G4double Z, G4double A, G4double kinEnergy);
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private:
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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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const G4ParticleDefinition* theProton;
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const G4ParticleDefinition* theElectron;
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const G4ParticleDefinition* thePositron;
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G4ParticleChangeForGamma* fParticleChange;
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G4NistManager* fNistManager;
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G4double coeff;
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G4double constn;
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G4double cosThetaMin;
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G4double cosThetaMax;
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G4double cosTetMaxNuc;
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G4double cosTetMaxElec;
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G4double q2Limit;
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G4double elecXSection;
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G4double nucXSection;
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G4double ecut;
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// projectile
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const G4ParticleDefinition* particle;
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G4double chargeSquare;
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G4double spin;
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G4double mass;
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G4double tkin;
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G4double mom2;
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G4double invbeta2;
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// target
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G4double targetZ;
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G4double targetA;
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G4double screenZ;
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G4double formfactA;
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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
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void G4eCoulombScatteringModel::SetupParticle(const G4ParticleDefinition* p)
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{
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// Initialise mass and charge
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if(p != particle) {
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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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tkin = 0.0;
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline void G4eCoulombScatteringModel::SetupKinematic(G4double ekin)
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{
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if(ekin != tkin) {
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tkin = ekin;
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mom2 = tkin*(tkin + 2.0*mass);
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invbeta2 = 1.0 + mass*mass/mom2;
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline void G4eCoulombScatteringModel::SetupTarget(G4double Z, G4double A,
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G4double e)
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{
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if(e != tkin || Z != targetZ || A != targetA) {
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targetZ = Z;
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targetA = A;
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SetupKinematic(e);
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cosTetMaxNuc = std::max(cosThetaMax, 1.0 - 0.5*q2Limit/mom2);
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G4double x = fNistManager->GetZ13(Z);
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screenZ = a0*x*x*(1.13 + 3.76*invbeta2*Z*Z*chargeSquare*alpha2)/mom2;
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if(particle == theProton && A < 1.5 && cosTetMaxNuc < 0.0)
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cosTetMaxNuc = 0.0;
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// A.V. Butkevich et al., NIM A 488 (2002) 282
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x = fNistManager->GetLOGA(A);
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formfactA = mom2*constn*std::exp(0.54*x);
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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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