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Geant4/processes/cuts/src/G4RToEConvForGamma.cc

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Differences between /processes/cuts/src/G4RToEConvForGamma.cc (Version 11.3.0) and /processes/cuts/src/G4RToEConvForGamma.cc (Version ReleaseNotes)


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  1 //                                                  1 
  2 // *******************************************    
  3 // * License and Disclaimer                       
  4 // *                                              
  5 // * The  Geant4 software  is  copyright of th    
  6 // * the Geant4 Collaboration.  It is provided    
  7 // * conditions of the Geant4 Software License    
  8 // * LICENSE and available at  http://cern.ch/    
  9 // * include a list of copyright holders.         
 10 // *                                              
 11 // * Neither the authors of this software syst    
 12 // * institutes,nor the agencies providing fin    
 13 // * work  make  any representation or  warran    
 14 // * regarding  this  software system or assum    
 15 // * use.  Please see the license in the file     
 16 // * for the full disclaimer and the limitatio    
 17 // *                                              
 18 // * This  code  implementation is the result     
 19 // * technical work of the GEANT4 collaboratio    
 20 // * By using,  copying,  modifying or  distri    
 21 // * any work based  on the software)  you  ag    
 22 // * use  in  resulting  scientific  publicati    
 23 // * acceptance of all terms of the Geant4 Sof    
 24 // *******************************************    
 25 //                                                
 26 // G4RToEConvForGamma class implementation        
 27 //                                                
 28 // Author: H.Kurashige, 05 October 2002 - Firs    
 29 // -------------------------------------------    
 30                                                   
 31 #include "G4RToEConvForGamma.hh"                  
 32 #include "G4ParticleDefinition.hh"                
 33 #include "G4ParticleTable.hh"                     
 34 #include "G4SystemOfUnits.hh"                     
 35 #include "G4Log.hh"                               
 36 #include "G4Exp.hh"                               
 37 #include "G4Pow.hh"                               
 38                                                   
 39 // -------------------------------------------    
 40 G4RToEConvForGamma::G4RToEConvForGamma()          
 41   : G4VRangeToEnergyConverter()                   
 42 {                                                 
 43   theParticle = G4ParticleTable::GetParticleTa    
 44   if (theParticle == nullptr)                     
 45   {                                               
 46 #ifdef G4VERBOSE                                  
 47     if (GetVerboseLevel()>0)                      
 48     {                                             
 49       G4cout << " G4RToEConvForGamma::G4RToECo    
 50       G4cout << "Gamma is not defined !!" << G    
 51     }                                             
 52 #endif                                            
 53   }                                               
 54   else                                            
 55   {                                               
 56     fPDG = theParticle->GetPDGEncoding();         
 57   }                                               
 58 }                                                 
 59                                                   
 60 // -------------------------------------------    
 61 G4RToEConvForGamma::~G4RToEConvForGamma()         
 62 {}                                                
 63                                                   
 64 // -------------------------------------------    
 65 G4double G4RToEConvForGamma::ComputeValue(cons    
 66                                           cons    
 67 {                                                 
 68   // Compute the "absorption" cross-section of    
 69   // Cross-section means here the sum of the c    
 70   // pair production, Compton scattering and p    
 71                                                   
 72   const G4double t1keV = 1.*CLHEP::keV;           
 73   const G4double t200keV = 200.*CLHEP::keV;       
 74   const G4double t100MeV = 100.*CLHEP::MeV;       
 75                                                   
 76   G4double Zsquare = Z*Z;                         
 77   G4double Zlog = G4Pow::GetInstance()->logZ(Z    
 78   G4double Zlogsquare = Zlog*Zlog;                
 79                                                   
 80   G4double tmin = (0.552+218.5/Z+557.17/Zsquar    
 81   G4double tlow = 0.2*G4Exp(-7.355/std::sqrt(Z    
 82                                                   
 83   G4double smin = (0.01239+0.005585*Zlog-0.000    
 84   G4double s200keV = (0.2651-0.1501*Zlog+0.022    
 85                                                   
 86   G4double cminlog = G4Log(tmin/t200keV);         
 87   G4double cmin = G4Log(s200keV/smin)/(cminlog    
 88                                                   
 89   G4double slowlog = G4Log(t200keV/tlow);         
 90   G4double slow = s200keV * G4Exp(0.042*Z*slow    
 91   G4double logtlow = G4Log(tlow/t1keV);           
 92   G4double clow = G4Log(300.*Zsquare/slow)/log    
 93   G4double chigh = (7.55e-5 - 0.0542e-5*Z)*Zsq    
 94                                                   
 95   // Calculate the cross-section (using an app    
 96   G4double xs;                                    
 97   if ( energy < tlow )                            
 98   {                                               
 99     xs = (energy < t1keV) ? slow*G4Exp(clow*lo    
100       slow*G4Exp(clow*G4Log(tlow/energy));        
101   }                                               
102   else if ( energy < t200keV )                    
103   {                                               
104     G4double x = G4Log(t200keV/energy);           
105     xs = s200keV * G4Exp(0.042*Z*x*x);            
106   }                                               
107   else if( energy<tmin )                          
108   {                                               
109     const G4double x = G4Log(tmin/energy);        
110     xs = smin * G4Exp(cmin*x*x);                  
111   }                                               
112   else                                            
113   {                                               
114     xs = smin + chigh*G4Log(energy/tmin);         
115   }                                               
116   return xs * CLHEP::barn;                        
117 }                                                 
118                                                   
119 // -------------------------------------------    
120