Gabriele Cosmo
181 lines
5.8 KiB
C++
181 lines
5.8 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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// G4ScreeningMottCrossSection.hh
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//-------------------------------------------------------------------
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//
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// GEANT4 Class header file
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//
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// File name: G4ScreeningMottCrossSection
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//
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// Author: Cristina Consolandi
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//
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// Creation date: 20.10.2011
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//
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// Modifications:
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//
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// Class Description:
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// Computation of electron Coulomb Scattering Cross Section.
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// Suitable for high energy electrons and light target materials.
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//
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// Reference:
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// M.J. Boschini et al.
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// "Non Ionizing Energy Loss induced by Electrons in the Space Environment"
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// Proc. of the 13th Int. Conf. on Particle Physics and Advanced Technology
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// (13th ICPPAT, Como 3-7/10/2011), World Scientific (Singapore).
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// Available at: http://arxiv.org/abs/1111.4042v4
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//
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// 1) Mott Differential Cross Section Approximation:
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// For Target material up to Z=92 (U):
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// As described in http://arxiv.org/abs/1111.4042v4
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// par. 2.1 , eq. (16)-(17)
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// Else (Z>92):
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// W. A. McKinley and H. Fashbach, Phys. Rev. 74, (1948) 1759.
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// 2) Screening coefficient:
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// vomn G. Moliere, Z. Naturforsh A2 (1947), 133-145; A3 (1948), 78.
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// 3) Nuclear Form Factor:
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// A.V. Butkevich et al. Nucl. Instr. Meth. A488 (2002), 282-294.
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//
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// -----------------------------------------------------------------------------
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//
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#ifndef G4ScreeningMottCrossSection_h
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#define G4ScreeningMottCrossSection_h 1
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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#include "globals.hh"
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#include "G4ParticleDefinition.hh"
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#include <vector>
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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static const G4int DIMMOTT = 750;
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class G4NistManager;
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class G4Pow;
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class G4ScreeningMottCrossSection
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{
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public:
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explicit G4ScreeningMottCrossSection();
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~G4ScreeningMottCrossSection();
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void Initialise(const G4ParticleDefinition*, G4double cosThetaLim);
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void SetupKinematic(G4double kinEnergy, G4int Z);
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G4double NuclearCrossSection(G4int form, G4int fast);
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G4double GetScatteringAngle(G4int form, G4int fast);
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G4double RatioMottRutherford(G4double tet);
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G4double RatioMottRutherfordCosT(G4double sin2t2);
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G4double McFcorrection(G4double sin2t2);
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inline void SetupParticle(const G4ParticleDefinition*);
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G4ScreeningMottCrossSection & operator=
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(const G4ScreeningMottCrossSection &right) = delete;
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G4ScreeningMottCrossSection(const G4ScreeningMottCrossSection&) = delete;
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private:
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G4double ComputeAngle(G4int idx, G4double& rand);
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G4double FormFactor2ExpHof(G4double sin2t2);
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G4double FormFactor2Gauss(G4double sin2t2);
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G4double FormFactor2UniformHelm(G4double sin2t2);
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G4double DifferentialXSection(G4int idx, G4int form);
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G4double GetTransitionRandom();
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G4NistManager* fNistManager;
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G4Pow* fG4pow;
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const G4ParticleDefinition* particle;
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G4double fTotalCross;
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//cost - min - max
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G4double cosThetaMin;// def 1.0
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G4double cosThetaMax;// def -1.0
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G4double cosTetMinNuc;
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G4double cosTetMaxNuc;
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//energy cut
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G4double ecut;
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G4double etag;
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G4double spin;
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G4double mass;
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//lab of incedent particle
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G4double tkinLab;
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G4double momLab2;
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G4double invbetaLab2;
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//relative system with nucleus
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G4double mu_rel;
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G4double tkin;
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G4double mom2;
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G4double invbeta2;
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G4double beta;
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G4double gamma;
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//constants
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G4double alpha;
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G4double htc2;
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G4double e2;
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// target nucleus
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G4double targetMass;
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G4double As;
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G4int targetZ;
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G4int targetA;
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// working array
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std::vector<G4double> cross;
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};
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline
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void G4ScreeningMottCrossSection::SetupParticle(const G4ParticleDefinition* p)
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{
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particle = p;
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mass = particle->GetPDGMass();
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spin = particle->GetPDGSpin();
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if(0.0 != spin) { spin = 0.5; }
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tkin = 0.0;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#endif
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