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 | // |
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27 | |
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28 | #include "globals.hh" |
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29 | #include "G4ios.hh" |
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30 | #include "G4XMesonBaryonElastic.hh" |
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31 | #include "G4KineticTrack.hh" |
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32 | #include "G4Gamma.hh" |
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33 | #include "G4PionPlus.hh" |
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34 | #include "G4Proton.hh" |
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35 | #include "G4XAqmElastic.hh" |
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36 | #include "G4XPDGElastic.hh" |
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37 | |
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38 | G4XMesonBaryonElastic::G4XMesonBaryonElastic() |
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39 | { |
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40 | // As a first approximation the model is assumed to be valid over |
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41 | // the entire energy range |
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42 | lowLimit = 0.; |
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43 | highLimit = DBL_MAX; |
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44 | } |
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45 | |
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46 | |
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47 | G4XMesonBaryonElastic::~G4XMesonBaryonElastic() |
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48 | { } |
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49 | |
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50 | |
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51 | G4bool G4XMesonBaryonElastic::operator==(const G4XMesonBaryonElastic &right) const |
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52 | { |
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53 | return (this == (G4XMesonBaryonElastic *) &right); |
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54 | } |
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55 | |
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56 | |
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57 | G4bool G4XMesonBaryonElastic::operator!=(const G4XMesonBaryonElastic &right) const |
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58 | { |
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59 | return (this != (G4XMesonBaryonElastic *) &right); |
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60 | } |
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61 | |
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62 | |
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63 | G4double G4XMesonBaryonElastic::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const |
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64 | { |
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65 | G4double sigma; |
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66 | |
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67 | // No gamma-baryon elastic scattering |
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68 | const G4ParticleDefinition* defLight = FindLightParticle(trk1,trk2); |
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69 | if (defLight == G4Gamma::GammaDefinition()) |
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70 | { |
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71 | sigma = 0; |
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72 | } |
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73 | else |
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74 | { |
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75 | |
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76 | G4LorentzVector p41 = trk1.Get4Momentum(); |
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77 | G4ThreeVector p3 = trk1.GetPosition(); |
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78 | G4ParticleDefinition* def = G4PionPlus::PionPlusDefinition(); |
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79 | |
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80 | G4KineticTrack piTrk(def, |
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81 | trk1.GetFormationTime(), |
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82 | p3, |
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83 | (G4LorentzVector&)p41); |
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84 | |
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85 | G4LorentzVector p42 = trk2.Get4Momentum(); |
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86 | G4KineticTrack pTrk(((G4ParticleDefinition*)G4Proton::ProtonDefinition()), |
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87 | trk2.GetFormationTime(), |
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88 | (G4ThreeVector)trk2.GetPosition(), |
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89 | (G4LorentzVector&)p42); |
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90 | |
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91 | G4XAqmElastic aqm; |
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92 | G4double xAqmDummy = aqm.CrossSection(piTrk,pTrk); |
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93 | G4double xAqm = aqm.CrossSection(trk1,trk2); |
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94 | G4double factor = 1.; |
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95 | if (xAqmDummy != 0.0) |
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96 | { |
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97 | factor = xAqm / xAqmDummy; |
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98 | } |
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99 | G4XPDGElastic pdg; |
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100 | |
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101 | sigma = pdg.CrossSection(piTrk,pTrk); |
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102 | sigma = sigma * factor; |
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103 | } |
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104 | |
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105 | return sigma; |
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106 | } |
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107 | |
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108 | |
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109 | G4String G4XMesonBaryonElastic::Name() const |
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110 | { |
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111 | G4String name("MesonBaryonElasticCrossSection"); |
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112 | return name; |
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113 | } |
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114 | |
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115 | |
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116 | |
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117 | G4bool G4XMesonBaryonElastic::IsValid(G4double e) const |
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118 | { |
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119 | G4bool answer = InLimits(e,lowLimit,highLimit); |
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120 | |
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121 | return answer; |
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122 | } |
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