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2 | // ******************************************************************** |
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11 | // * Neither the authors of this software system, nor their employing * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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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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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 | // $Id: G4UnstableFragmentBreakUp.cc,v 1.8 2010/06/25 09:46:09 gunter Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-04-ref-00 $ |
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28 | // |
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29 | // ------------------------------------------------------------------- |
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30 | // GEANT 4 class file |
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31 | // |
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32 | // CERN, Geneva, Switzerland |
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33 | // |
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34 | // File name: G4UnstableFragmentBreakUp |
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35 | // |
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36 | // Author: V.Ivanchenko |
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37 | // |
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38 | // Creation date: 11 May 2010 |
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39 | // |
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40 | //Modifications: |
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41 | // |
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42 | // ------------------------------------------------------------------- |
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43 | // |
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44 | |
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45 | #include "G4UnstableFragmentBreakUp.hh" |
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46 | #include "Randomize.hh" |
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47 | #include "G4LorentzVector.hh" |
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48 | #include "G4Fragment.hh" |
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49 | #include "G4FragmentVector.hh" |
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50 | #include "G4NucleiProperties.hh" |
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51 | #include "G4NistManager.hh" |
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52 | |
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53 | G4int G4UnstableFragmentBreakUp::Zfr[6] = {0}; |
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54 | G4int G4UnstableFragmentBreakUp::Afr[6] = {0}; |
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55 | G4double G4UnstableFragmentBreakUp::masses[6] = {0.0}; |
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56 | |
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57 | G4UnstableFragmentBreakUp::G4UnstableFragmentBreakUp() |
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58 | :verbose(0) |
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59 | { |
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60 | fNistManager = G4NistManager::Instance(); |
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61 | if(0 == Afr[0]) { |
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62 | G4int z[6] = {0, 1, 1, 1, 2, 2}; |
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63 | G4int a[6] = {1, 1, 2, 3, 3, 4}; |
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64 | for(G4int i=0; i<6; ++i) { |
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65 | Zfr[i] = z[i]; |
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66 | Afr[i] = a[i]; |
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67 | masses[i] = G4NucleiProperties::GetNuclearMass(a[i], z[i]); |
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68 | } |
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69 | } |
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70 | } |
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71 | |
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72 | G4UnstableFragmentBreakUp::~G4UnstableFragmentBreakUp() |
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73 | {} |
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74 | |
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75 | void G4UnstableFragmentBreakUp::Initialize(const G4Fragment&) |
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76 | {} |
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77 | |
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78 | G4Fragment* G4UnstableFragmentBreakUp::EmittedFragment(G4Fragment*) |
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79 | { |
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80 | return 0; |
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81 | } |
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82 | |
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83 | G4FragmentVector* G4UnstableFragmentBreakUp::BreakUpFragment(G4Fragment* nucleus) |
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84 | { |
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85 | //G4cout << "G4UnstableFragmentBreakUp::BreakUpFragment" << G4endl; |
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86 | G4FragmentVector * theResult = new G4FragmentVector(); |
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87 | |
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88 | G4int Z = nucleus->GetZ_asInt(); |
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89 | G4int A = nucleus->GetA_asInt(); |
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90 | G4int Amax = A; |
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91 | G4LorentzVector lv = nucleus->GetMomentum(); |
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92 | G4double time = nucleus->GetCreationTime(); |
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93 | |
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94 | G4double deltaE, mass, mass1(0.0), mass2(0.0); |
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95 | G4int i, index; |
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96 | |
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97 | // Starts loop over evaporated particles, loop is limited by number |
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98 | // of nucleons |
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99 | for(G4int ia=0; ia<Amax; ++ia) { |
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100 | |
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101 | mass = lv.mag(); |
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102 | deltaE = 0.0; |
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103 | index = -1; |
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104 | for(i=0; i<6; ++i) { |
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105 | G4int Zres = Z - Zfr[i]; |
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106 | G4int Ares = A - Afr[i]; |
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107 | if(Zres >= 0 && Ares >= Zres && Ares > 0) { |
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108 | G4double m1 = G4NucleiProperties::GetNuclearMass(Ares, Zres); |
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109 | G4double de = mass - m1 - masses[i]; |
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110 | if(de > deltaE) { |
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111 | mass1 = m1; |
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112 | mass2 = masses[i]; |
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113 | deltaE= de; |
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114 | index = i; |
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115 | } |
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116 | } |
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117 | } |
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118 | |
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119 | // no decay channels |
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120 | if(index < 0) { break; } |
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121 | |
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122 | // compute energy of light fragment |
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123 | G4double e2 = 0.5*((mass - mass1)*(mass + mass1) + mass2*mass2)/mass; |
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124 | if(e2 < mass2) { break; } |
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125 | |
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126 | // sample decay |
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127 | G4ThreeVector bst = lv.boostVector(); |
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128 | |
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129 | G4double cosTheta = 1. - 2. * G4UniformRand(); |
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130 | G4double sinTheta = std::sqrt(1. - cosTheta * cosTheta); |
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131 | G4double phi = twopi * G4UniformRand(); |
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132 | G4double mom = std::sqrt((e2 - mass2)*(e2 + mass2)); |
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133 | G4LorentzVector mom2(mom * sinTheta * std::cos(phi), |
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134 | mom * sinTheta * std::sin(phi), |
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135 | mom * cosTheta, |
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136 | e2); |
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137 | mom2.boost(bst); |
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138 | G4Fragment* fr = new G4Fragment(Afr[index], Zfr[index], mom2); |
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139 | fr->SetCreationTime(time); |
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140 | theResult->push_back(fr); |
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141 | |
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142 | // residual |
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143 | lv -= mom2; |
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144 | Z -= Zfr[index]; |
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145 | A -= Afr[index]; |
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146 | } |
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147 | |
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148 | // updated fragment |
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149 | if( theResult->size() > 0) { |
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150 | nucleus->SetZandA_asInt(Z, A); |
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151 | nucleus->SetMomentum(lv); |
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152 | } |
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153 | |
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154 | return theResult; |
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155 | } |
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156 | |
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157 | G4FragmentVector* G4UnstableFragmentBreakUp::BreakUp(const G4Fragment&) |
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158 | { |
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159 | return 0; |
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160 | } |
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161 | |
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162 | G4double G4UnstableFragmentBreakUp::GetEmissionProbability() const |
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163 | { |
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164 | return 0.0; |
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165 | } |
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