00001 // 00002 // ******************************************************************** 00003 // * License and Disclaimer * 00004 // * * 00005 // * The Geant4 software is copyright of the Copyright Holders of * 00006 // * the Geant4 Collaboration. It is provided under the terms and * 00007 // * conditions of the Geant4 Software License, included in the file * 00008 // * LICENSE and available at http://cern.ch/geant4/license . These * 00009 // * include a list of copyright holders. * 00010 // * * 00011 // * Neither the authors of this software system, nor their employing * 00012 // * institutes,nor the agencies providing financial support for this * 00013 // * work make any representation or warranty, express or implied, * 00014 // * regarding this software system or assume any liability for its * 00015 // * use. Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // $Id: G4hBremsstrahlungModel.cc 66996 2013-01-29 14:50:52Z gcosmo $ 00027 // 00028 // ------------------------------------------------------------------- 00029 // 00030 // GEANT4 Class file 00031 // 00032 // 00033 // File name: G4hBremsstrahlungModel 00034 // 00035 // Author: Vladimir Ivanchenko on base of G4MuBremsstrahlungModel 00036 // 00037 // Creation date: 28.02.2008 00038 // 00039 // Modifications: 00040 // 00041 00042 // 00043 // Class Description: 00044 // 00045 // 00046 // ------------------------------------------------------------------- 00047 // 00048 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 00049 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 00050 00051 #include "G4hBremsstrahlungModel.hh" 00052 #include "G4PhysicalConstants.hh" 00053 #include "G4SystemOfUnits.hh" 00054 00055 using namespace std; 00056 00057 G4hBremsstrahlungModel::G4hBremsstrahlungModel(const G4ParticleDefinition* p, 00058 const G4String& nam) 00059 : G4MuBremsstrahlungModel(p, nam) 00060 {} 00061 00062 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 00063 00064 G4hBremsstrahlungModel::~G4hBremsstrahlungModel() 00065 {} 00066 00067 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 00068 00069 G4double G4hBremsstrahlungModel::ComputeDMicroscopicCrossSection( 00070 G4double tkin, 00071 G4double Z, 00072 G4double gammaEnergy) 00073 // differential cross section 00074 { 00075 G4double dxsection = 0.; 00076 00077 if( gammaEnergy > tkin) return dxsection ; 00078 // G4cout << "G4hBremsstrahlungModel m= " << mass 00079 // << " " << particle->GetParticleName() << G4endl; 00080 G4double E = tkin + mass ; 00081 G4double v = gammaEnergy/E ; 00082 G4double delta = 0.5*mass*mass*v/(E-gammaEnergy) ; 00083 G4double rab0=delta*sqrte ; 00084 00085 G4int iz = G4int(Z); 00086 if(iz < 1) iz = 1; 00087 00088 G4double z13 = 1.0/nist->GetZ13(iz); 00089 G4double dn = mass*nist->GetA27(iz)/(70.*MeV); 00090 00091 G4double b = btf; 00092 if(1 == iz) b = bh; 00093 00094 // nucleus contribution logarithm 00095 G4double rab1=b*z13; 00096 G4double fn=log(rab1/(dn*(electron_mass_c2+rab0*rab1))* 00097 (mass+delta*(dn*sqrte-2.))) ; 00098 if(fn <0.) fn = 0. ; 00099 00100 G4double x = 1.0 - v; 00101 if(particle->GetPDGSpin() != 0) x += 0.75*v*v; 00102 00103 dxsection = coeff*x*Z*Z*fn/gammaEnergy; 00104 00105 return dxsection; 00106 } 00107 00108 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
1.4.7