include/Geant4/G4IonCoulombCrossSection.hh

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0025 //
0026 //  G4IonCoulombCrossSection.hh
0027 //-------------------------------------------------------------------
0028 //
0029 // GEANT4 Class header file
0030 //
0031 // File name:    G4IonCoulombCrossSection
0032 //
0033 // Author:      Cristina Consolandi
0034 //
0035 // Creation date: 05.10.2010 from G4eCoulombScatteringModel
0036 //
0037 // Class Description:
0038 //      Computation of Screen-Coulomb Cross Section
0039 //      for protons, alpha and heavy Ions
0040 //
0041 //
0042 // Reference:
0043 //      M.J. Boschini et al. "Nuclear and Non-Ionizing Energy-Loss
0044 //      for Coulomb Scattered Particles from Low Energy up to Relativistic
0045 //      Regime in Space Radiation Environment"
0046 //      Accepted for publication in the Proceedings of  the  ICATPP Conference
0047 //      on Cosmic Rays for Particle and Astroparticle Physics, Villa  Olmo, 7-8
0048 //      October,  2010, to be published by World Scientific (Singapore).
0049 //
0050 //      Available for downloading at:
0051 //      http://arxiv.org/abs/1011.4822
0052 //
0053 // -------------------------------------------------------------------
0054
0055 //
0056 #ifndef G4IonCoulombCrossSection_h
0057 #define G4IonCoulombCrossSection_h 1
0058
0059 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0060
0061 #include <CLHEP/Units/SystemOfUnits.h>
0062
0063 #include "globals.hh"
0064 #include "G4NistManager.hh"
0065 #include "G4ParticleDefinition.hh"
0066
0067 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0068
0069 class G4IonCoulombCrossSection
0070 {
0071 public:
0072
0073   explicit G4IonCoulombCrossSection();
0074
0075   ~G4IonCoulombCrossSection() = default;
0076
0077   void Initialise(const G4ParticleDefinition*, G4double cosThetaLim);
0078
0079   G4double NuclearCrossSection();
0080
0081   G4double SampleCosineTheta();
0082
0083   void SetupKinematic(G4double kinEnergy, G4double tmass);
0084
0085   void SetupTarget(G4double Z, G4double kinEnergy, G4int heavycorr);
0086
0087   inline void SetupParticle(const G4ParticleDefinition*);
0088
0089   inline G4double GetMomentum2();
0090
0091   G4IonCoulombCrossSection & operator=
0092   (const  G4IonCoulombCrossSection &right) = delete;
0093   G4IonCoulombCrossSection(const  G4IonCoulombCrossSection&) = delete;
0094
0095 private:
0096
0097   void   SetScreenRSquare(G4int iz);
0098
0099   const G4ParticleDefinition* theProton;
0100
0101   G4NistManager*  fNistManager;
0102   G4Pow*          fG4pow;
0103
0104   G4double                coeff;
0105
0106   //cost - min - max
0107   G4double                cosThetaMin;// def 1.0
0108   G4double                cosThetaMax;// def -1.0
0109   //SetupTarget
0110   G4double                cosTetMinNuc;// -->cosThetaMin
0111   G4double                cosTetMaxNuc;// -->cosThetaMax
0112
0113   //cross section
0114   G4double                nucXSection;
0115
0116   //energy
0117   G4double                etag;
0118
0119   // projectile........................
0120   const G4ParticleDefinition* particle;
0121
0122   G4double                chargeSquare;
0123   G4double                spin;
0124   G4double                mass;
0125
0126   //lab of incedent particle
0127   G4double                tkinLab;
0128   G4double                momLab2;
0129   G4double                invbetaLab2;
0130
0131   //relative system with nucleus
0132   G4double                tkin;
0133   G4double                mom2;
0134   G4double                invbeta2;
0135
0136   // target nucleus
0137   G4double                targetZ;
0138   G4double                targetMass;
0139   G4double                screenZ;
0140   G4double                alpha2;
0141   G4double        ScreenRSquare;
0142 };
0143
0144 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0145
0146 inline
0147 void G4IonCoulombCrossSection::SetupParticle(const G4ParticleDefinition* p)
0148 {
0149   particle = p;
0150   mass = particle->GetPDGMass();
0151   spin = particle->GetPDGSpin();
0152   if(0.0 != spin) { spin = 0.5; }
0153   G4double q = particle->GetPDGCharge()/CLHEP::eplus;
0154   chargeSquare = q*q;
0155   tkin = 0.0;
0156 }
0157 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0158
0159 inline G4double G4IonCoulombCrossSection::GetMomentum2()
0160 {
0161   return mom2;
0162 }
0163 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0164
0165 #endif
0166
0167