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1 // 2 // ******************************************************************** 3 // * License and Disclaimer * 4 // * * 5 // * The Geant4 software is copyright of the Copyright Holders of * 6 // * the Geant4 Collaboration. It is provided under the terms and * 7 // * conditions of the Geant4 Software License, included in the file * 8 // * LICENSE and available at http://cern.ch/geant4/license . These * 9 // * include a list of copyright holders. * 10 // * * 11 // * Neither the authors of this software system, nor their employing * 12 // * institutes,nor the agencies providing financial support for this * 13 // * work make any representation or warranty, express or implied, * 14 // * regarding this software system or assume any liability for its * 15 // * use. Please see the license in the file LICENSE and URL above * 16 // * for the full disclaimer and the limitation of liability. * 17 // * * 18 // * This code implementation is the result of the scientific and * 19 // * technical work of the GEANT4 collaboration. * 20 // * By using, copying, modifying or distributing the software (or * 21 // * any work based on the software) you agree to acknowledge its * 22 // * use in resulting scientific publications, and indicate your * 23 // * acceptance of all terms of the Geant4 Software license. * 24 // ******************************************************************** 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