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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