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Geant4/processes/hadronic/models/lend/src/G4LENDGammaCrossSection.cc

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 25 //
 26 ////////////////////////////////////////////////////////////////////////////////
 27 //                                                                            //
 28 //  File:   G4LENDGammaCrossSection.cc                                        //
 29 //  Date:   30 March 2020                                                     //
 30 //  Author: Dennis H. Wright                                                  //
 31 //                                                                            //
 32 //  Description: cross sections for inelastic scattering of gammas from       //
 33 //               nuclei including gamma-induced fission.  This cross section  //
 34 //               is very similar to G4LENDCombinedCrossSection except that    //
 35 //               does not sample elastic or capture reactions since there are //
 36 //               no such data for gammas in GND.                              //
 37 //                                                                            //
 38 ////////////////////////////////////////////////////////////////////////////////
 39 
 40 #include "G4LENDGammaCrossSection.hh"
 41 #include "G4LENDInelasticCrossSection.hh"
 42 #include "G4LENDFissionCrossSection.hh"
 43 #include "Randomize.hh"
 44 
 45 
 46 G4LENDGammaCrossSection::G4LENDGammaCrossSection(G4ParticleDefinition* pd)
 47  :G4LENDCrossSection("LENDGammaCrossSection")
 48 {
 49   proj = pd;
 50   inelasticXS = new G4LENDInelasticCrossSection(pd);   
 51   fissionXS = new G4LENDFissionCrossSection(pd);   
 52 }
 53 
 54 void G4LENDGammaCrossSection::BuildPhysicsTable(const G4ParticleDefinition& pd)
 55 {
 56   inelasticXS->BuildPhysicsTable(pd);
 57   fissionXS->BuildPhysicsTable(pd);
 58   create_used_target_map();
 59 }
 60 
 61 G4double 
 62 G4LENDGammaCrossSection::GetIsoCrossSection(const G4DynamicParticle* dp, 
 63                                             G4int iZ, G4int iA,
 64                                             const G4Isotope* isotope,
 65                                             const G4Element*,
 66                                             const G4Material* material)
 67 {
 68   G4double XS = 0.0;
 69   XS += inelasticXS->GetIsoCrossSection(dp, iZ, iA, isotope, NULL, material);
 70   XS += fissionXS->GetIsoCrossSection(dp, iZ, iA, isotope, NULL, material);
 71   //G4cout << "G4LENDGammaCrossSection::GetIsoCrossSection " 
 72   //       << XS/CLHEP::barn << " [barn]" << G4endl;
 73   return XS;
 74 }
 75 
 76 G4int G4LENDGammaCrossSection::SelectChannel(const G4DynamicParticle* dp,
 77                                              G4int iZ, G4int iA,
 78                                              const G4Isotope* isotope,
 79                                              const G4Element*,
 80                                              const G4Material* material)
 81 {
 82   G4int ichannel = 1;
 83   G4double XSs[2];
 84   XSs[0] = inelasticXS->GetIsoCrossSection(dp, iZ, iA, isotope, nullptr, material);
 85   XSs[1] = XSs[0] + fissionXS->GetIsoCrossSection(dp, iZ, iA, isotope, nullptr, material);
 86 
 87   G4double total = XSs[1];
 88 
 89   G4double random = G4UniformRand();
 90   for (G4int i = 0; i < 2; i++) {
 91     if (random*total < XSs[i]) { 
 92       ichannel = i;
 93       break; 
 94     }
 95   }
 96    
 97   return ichannel;
 98 }
 99 
100