| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | #ifndef G4CrossSectionBuffer_h
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| 27 | #define G4CrossSectionBuffer_h
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| 28 |
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| 29 | #include "G4ParticleDefinition.hh"
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| 30 | #include "globals.hh"
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| 31 | #include <utility>
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| 32 | #include <vector>
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| 33 |
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| 34 | class G4CrossSectionBuffer
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| 35 | {
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| 36 | public:
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| 37 |
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| 38 | G4CrossSectionBuffer(const G4ParticleDefinition * aA, const G4ParticleDefinition * aB)
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| 39 | : theA(aA), theB(aB) {}
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| 40 |
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| 41 | G4bool InCharge(const G4ParticleDefinition * aA, const G4ParticleDefinition * aB) const
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| 42 | {
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| 43 | G4bool result = false;
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| 44 | if(aA == theA)
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| 45 | {
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| 46 | if(aB == theB) result = true;
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| 47 | }
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| 48 | else if(aA == theB)
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| 49 | {
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| 50 | if(aB == theA) result = true;
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| 51 | }
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| 52 | return result;
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| 53 | }
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| 54 |
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| 55 | void push_back(G4double s, G4double x)
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| 56 | {
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| 57 | std::pair<G4double, G4double> aNew;
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| 58 | aNew.first = s;
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| 59 | aNew.second = x;
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| 60 | theData.push_back(aNew);
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| 61 | }
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| 62 | G4double CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const
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| 63 | {
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| 64 | G4double sqrts = (trk1.Get4Momentum()+trk2.Get4Momentum()).mag();
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| 65 | G4double x1(1), y1(0);
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| 66 | G4double x2(2), y2(0);
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| 67 |
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| 68 | if(theData.size()==1) return theData[theData.size()-1].second;
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| 69 |
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| 70 | for(size_t i=0; i<theData.size(); i++)
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| 71 | {
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| 72 | if(theData[i].first>sqrts)
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| 73 | {
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| 74 | if(0==i)
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| 75 | {
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| 76 | x1 = theData[i].first;
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| 77 | y1 = theData[i].second;
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| 78 | x2 = theData[i+1].first;
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| 79 | y2 = theData[i+1].second;
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| 80 | }
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| 81 | else if(theData.size()-1==i)
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| 82 | {
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| 83 | x1 = theData[theData.size()-2].first;
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| 84 | y1 = theData[theData.size()-2].second;
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| 85 | x2 = theData[theData.size()-1].first;
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| 86 | y2 = theData[theData.size()-1].second;
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| 87 | }
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| 88 | else
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| 89 | {
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| 90 | x1 = theData[i-1].first;
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| 91 | y1 = theData[i-1].second;
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| 92 | x2 = theData[i].first;
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| 93 | y2 = theData[i].second;
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| 94 | }
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| 95 | break;
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| 96 | }
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| 97 | }
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| 98 | // LINLIN interpolation
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| 99 | // G4cerr << "!!!!!! "<<sqrts<<" "<<x1<<" "<<x2<<" "<<y1<<" "<<y2<<" "<<i<<G4endl;
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| 100 | G4double result = y1 + (sqrts-x1) * (y2-y1)/(x2-x1);
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| 101 | if(result<0) result = 0;
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| 102 | if(y1<0.01*millibarn) result = 0;
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| 103 | return result;
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| 104 | }
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| 105 |
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| 106 | void Print()
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| 107 | {
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| 108 | for(size_t i=0;i<theData.size(); i++)
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| 109 | {
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| 110 | G4cerr << "sqrts = "<<theData[i].first<<", X = "<<theData[i].second/millibarn<<G4endl;
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| 111 | }
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| 112 | }
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| 113 |
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| 114 | private:
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| 115 | std::vector<std::pair<G4double, G4double> > theData;
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| 116 |
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| 117 | const G4ParticleDefinition * theA;
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| 118 | const G4ParticleDefinition * theB;
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| 119 | };
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| 120 |
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| 121 | #endif
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