Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/electromagnetic/standard/src/G4WentzelVIRelXSection.cc

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 25 //
 26 //
 27 // -------------------------------------------------------------------
 28 //
 29 // GEANT4 Class file
 30 //
 31 //
 32 // File name:   G4WentzelVIRelXSection
 33 //
 34 // Author:      V.Ivanchenko 
 35 //
 36 // Creation date: 08.06.2012 from G4WentzelOKandVIxSection
 37 //
 38 // Modifications:
 39 //
 40 //
 41 
 42 // -------------------------------------------------------------------
 43 //
 44 
 45 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 46 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 47 
 48 #include "G4WentzelVIRelXSection.hh"
 49 
 50 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 51 
 52 G4WentzelVIRelXSection::G4WentzelVIRelXSection() = default;
 53 
 54 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 55 
 56 G4WentzelVIRelXSection::~G4WentzelVIRelXSection() = default;
 57 
 58 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 59 
 60 G4double G4WentzelVIRelXSection::SetupKinematic(G4double kinEnergy,
 61                                           const G4Material* mat)
 62 {
 63   if(kinEnergy != tkin || mat != currentMaterial) { 
 64 
 65     currentMaterial = mat;
 66     tkin  = kinEnergy;
 67     G4double momLab2  = tkin*(tkin + 2.0*mass);
 68   
 69     G4double etot = tkin + mass;
 70     G4double ptot = std::sqrt(momLab2);
 71     G4double m12  = mass*mass;
 72 
 73     // relativistic reduced mass from publucation
 74     // A.P. Martynenko, R.N. Faustov, Teoret. mat. Fiz. 64 (1985) 179
 75         
 76     //incident particle & target nucleus
 77     G4double Ecm = std::sqrt(m12 + targetMass*targetMass + 2.0*etot*targetMass);
 78     G4double mu_rel = mass*targetMass/Ecm;
 79     G4double momCM  = ptot*targetMass/Ecm;
 80     // relative system
 81     mom2 = momCM*momCM;
 82     invbeta2 = 1.0 +  mu_rel*mu_rel/mom2;
 83 
 84     factB = spin/invbeta2;
 85     factD = std::sqrt(mom2)/targetMass;
 86     cosTetMaxNuc = isCombined ? 
 87       std::max(cosThetaMax, 1.-factorA2*mat->GetIonisation()->GetInvA23()/mom2)
 88       : cosThetaMax;
 89   } 
 90   return cosTetMaxNuc;
 91 }
 92 
 93 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 94 
 95