Geant4 Cross Reference |
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 // 27 // ------------------------------------------- 28 // GEANT4 Class file 29 // 30 // For information related to this code c 31 // 32 // File name: G4CrossSectionPatch 33 // 34 // Author: 35 // 36 // Creation date: 15 April 1999 37 // 38 // Modifications: 39 // 40 // ------------------------------------------- 41 42 #include "globals.hh" 43 #include "G4CrossSectionPatch.hh" 44 #include "G4VCrossSectionSource.hh" 45 #include "G4KineticTrack.hh" 46 #include "G4CrossSectionVector.hh" 47 48 G4CrossSectionPatch::G4CrossSectionPatch() 49 { } 50 51 52 G4CrossSectionPatch::~G4CrossSectionPatch() 53 { } 54 55 56 G4bool G4CrossSectionPatch::operator==(const G 57 { 58 return (this == (G4CrossSectionPatch*) &righ 59 } 60 61 62 G4bool G4CrossSectionPatch::operator!=(const G 63 { 64 return (this != (G4CrossSectionPatch*) &righ 65 } 66 67 68 G4double G4CrossSectionPatch::CrossSection(con 69 const G4KineticTrack& trk2) const 70 { 71 // The cross section is provided by one of t 72 // validity range 73 74 G4double crossSection = 0.; 75 G4double ecm = (trk1.Get4Momentum() + trk2.G 76 77 const G4CrossSectionVector* components = Get 78 if (components != 0) 79 { 80 std::size_t nComponents = this->GetCompo 81 82 for (std::size_t i=0; i<nComponents; ++i 83 { 84 G4CrossSectionSourcePtr componentPtr 85 G4VCrossSectionSource* component = compone 86 if (component->IsValid(ecm)) 87 { 88 crossSection = component->CrossSection 89 } 90 else if (i < (nComponents - 1) ) 91 { 92 G4CrossSectionSourcePtr nextPtr = (*co 93 G4VCrossSectionSource* next = nextPtr( 94 if (ecm > component->HighLimit() && ec 95 { 96 // Merge cross-sections in transition re 97 crossSection = Transition(trk1,trk2,comp 98 } 99 } 100 } 101 } 102 103 return crossSection; 104 } 105 106 107 G4bool G4CrossSectionPatch::IsValid(G4double e 108 { 109 // The Patch is valid if any of its componen 110 G4bool answer = false; 111 const G4CrossSectionVector* components = Get 112 if (components != 0) 113 { 114 std::size_t n = components->size(); 115 for (std::size_t i=0; i<n; ++i) 116 { 117 G4CrossSectionSourcePtr componentPtr = (*c 118 G4VCrossSectionSource* component = c 119 if (component->IsValid(e)) 120 { 121 answer = true; 122 break; 123 } 124 } 125 } 126 return answer; 127 } 128 129 130 G4double G4CrossSectionPatch::Transition(const 131 const G4VCrossSectionSource* c 132 const G4VCrossSectionSource* c 133 { 134 //Merge two cross sections in the transition 135 136 G4double crossSection = 0.; 137 138 G4double ecm = (trk1.Get4Momentum() + trk2.G 139 G4double sigma1 = comp1->CrossSection(trk1,t 140 G4double sigma2 = comp2->CrossSection(trk1,t 141 G4double denom = comp2->LowLimit() - comp1-> 142 G4double diff = ecm - comp1->HighLimit(); 143 if (denom > 0. && diff > 0.) 144 { 145 G4double ratio = diff / denom; 146 crossSection = (1.- ratio) * sigma1 + ra 147 } 148 149 return crossSection; 150 } 151 152 153 G4double G4CrossSectionPatch::Transition(G4dou 154 G4double sigma1, G4double sigma2, 155 G4double e1, G4double e2) const 156 { 157 //Merge two cross sections in the transition 158 159 G4double crossSection = 0.; 160 161 G4double denom = e2 - e1; 162 G4double diff = ecm - e1; 163 if (denom > 0. && diff > 0.) 164 { 165 G4double ratio = diff / denom; 166 crossSection = (1.- ratio) * sigma1 + ra 167 } 168 169 return crossSection; 170 } 171 172