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 | // GEANT4 Class file |
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29 | // |
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30 | // For information related to this code contact: |
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31 | // |
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32 | // File name: G4XAqmTotal |
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33 | // |
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34 | // Author: |
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35 | // |
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36 | // Creation date: 15 April 1999 |
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37 | // |
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38 | // Modifications: |
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39 | // |
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40 | // Additive Quark Model total cross section |
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41 | // (H.J. Lipkin and F. Scheck, Phys.Rev. 16 (1966) 71 |
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42 | // |
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43 | // ------------------------------------------------------------------- |
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44 | |
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45 | #include "globals.hh" |
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46 | #include "G4ios.hh" |
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47 | #include "G4XAqmTotal.hh" |
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48 | #include "G4KineticTrack.hh" |
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49 | #include "G4ParticleDefinition.hh" |
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50 | |
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51 | |
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52 | // Validity range of this cross-section |
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53 | const G4double G4XAqmTotal::_lowLimit = 0.; |
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54 | const G4double G4XAqmTotal::_highLimit = DBL_MAX; |
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55 | |
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56 | G4XAqmTotal::G4XAqmTotal() |
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57 | { |
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58 | // As a first approximation the model is assumed to be valid over |
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59 | // the entire energy range |
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60 | } |
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61 | |
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62 | |
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63 | G4XAqmTotal::~G4XAqmTotal() |
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64 | { } |
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65 | |
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66 | |
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67 | G4bool G4XAqmTotal::operator==(const G4XAqmTotal &right) const |
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68 | { |
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69 | return (this == (G4XAqmTotal *) &right); |
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70 | } |
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71 | |
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72 | |
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73 | G4bool G4XAqmTotal::operator!=(const G4XAqmTotal &right) const |
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74 | { |
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75 | return (this != (G4XAqmTotal *) &right); |
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76 | } |
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77 | |
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78 | |
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79 | G4double G4XAqmTotal::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const |
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80 | { |
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81 | G4double sigma = 0.; |
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82 | |
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83 | // Get strangeness content |
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84 | G4ParticleDefinition* def1 = trk1.GetDefinition(); |
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85 | G4int sTrk1 = def1->GetQuarkContent(3) + def1->GetAntiQuarkContent(3); |
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86 | G4ParticleDefinition* def2 = trk2.GetDefinition(); |
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87 | G4int sTrk2 = def2->GetQuarkContent(3) + def2->GetAntiQuarkContent(3); |
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88 | |
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89 | // Get non-strange quark content |
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90 | G4int qTrk1 = def1->GetQuarkContent(1) + def1->GetAntiQuarkContent(1) + |
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91 | def1->GetQuarkContent(2) + def1->GetAntiQuarkContent(2) + |
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92 | def1->GetQuarkContent(4) + def1->GetAntiQuarkContent(4) + |
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93 | def1->GetQuarkContent(5) + def1->GetAntiQuarkContent(5) + |
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94 | def1->GetQuarkContent(6) + def1->GetAntiQuarkContent(6); |
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95 | |
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96 | G4int qTrk2 = def2->GetQuarkContent(1) + def2->GetAntiQuarkContent(1) + |
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97 | def2->GetQuarkContent(2) + def2->GetAntiQuarkContent(2) + |
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98 | def2->GetQuarkContent(4) + def2->GetAntiQuarkContent(4) + |
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99 | def2->GetQuarkContent(5) + def2->GetAntiQuarkContent(5) + |
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100 | def2->GetQuarkContent(6) + def2->GetAntiQuarkContent(6); |
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101 | |
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102 | G4double sRatio1 = 0.; |
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103 | if (qTrk1 != 0) sRatio1 = sTrk1 / qTrk1; |
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104 | |
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105 | G4double sRatio2 = 0.; |
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106 | if (qTrk2 != 0) sRatio2 = sTrk2 / qTrk2; |
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107 | |
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108 | // Calculate the number of colliding mesons |
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109 | G4int nMesons = 0; |
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110 | G4int nQ1 = sTrk1 + qTrk1; |
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111 | |
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112 | if (nQ1 == 2) nMesons++; |
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113 | G4int nQ2 = sTrk2 + qTrk2; |
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114 | if (nQ2 == 2) nMesons++; |
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115 | |
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116 | // Cross-section (units to be checked!) |
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117 | sigma = 40. * std::pow((2.0/3.0),nMesons) * (1. - 0.4 * sRatio1) * (1. - 0.4 * sRatio2) * millibarn; |
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118 | |
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119 | return sigma; |
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120 | } |
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121 | |
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122 | |
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123 | G4String G4XAqmTotal::Name() const |
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124 | { |
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125 | G4String name("AqmTotalCrossSection"); |
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126 | return name; |
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127 | } |
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128 | |
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129 | |
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130 | |
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131 | G4bool G4XAqmTotal::IsValid(G4double e) const |
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132 | { |
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133 | G4bool answer = InLimits(e,_lowLimit,_highLimit); |
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134 | |
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135 | return answer; |
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136 | } |
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