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 | // $Id: G4PreCompoundFragment.cc,v 1.8 2009/02/10 16:01:37 vnivanch Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
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28 | // |
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29 | // J. M. Quesada (August 2008). |
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30 | // Based on previous work by V. Lara |
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31 | // JMQ (06 September 2008) Also external choice has been added for: |
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32 | // - superimposed Coulomb barrier (if useSICB=true) |
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33 | // |
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34 | #include "G4PreCompoundFragment.hh" |
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35 | |
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36 | G4PreCompoundFragment:: |
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37 | G4PreCompoundFragment(const G4PreCompoundFragment &right) : |
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38 | G4VPreCompoundFragment(right) |
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39 | {} |
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40 | |
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41 | |
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42 | G4PreCompoundFragment:: |
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43 | G4PreCompoundFragment(const G4double anA, |
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44 | const G4double aZ, |
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45 | G4VCoulombBarrier* aCoulombBarrier, |
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46 | const G4String & aName): |
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47 | G4VPreCompoundFragment(anA,aZ,aCoulombBarrier,aName) |
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48 | { |
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49 | } |
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50 | |
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51 | |
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52 | |
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53 | G4PreCompoundFragment::~G4PreCompoundFragment() |
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54 | { |
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55 | } |
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56 | |
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57 | |
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58 | const G4PreCompoundFragment & G4PreCompoundFragment:: |
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59 | operator= (const G4PreCompoundFragment & right) |
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60 | { |
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61 | if (&right != this) this->G4VPreCompoundFragment::operator=(right); |
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62 | return *this; |
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63 | } |
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64 | |
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65 | G4int G4PreCompoundFragment::operator==(const G4PreCompoundFragment & right) const |
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66 | { |
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67 | return G4VPreCompoundFragment::operator==(right); |
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68 | } |
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69 | |
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70 | G4int G4PreCompoundFragment::operator!=(const G4PreCompoundFragment & right) const |
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71 | { |
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72 | return G4VPreCompoundFragment::operator!=(right); |
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73 | } |
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74 | |
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75 | |
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76 | G4double G4PreCompoundFragment:: |
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77 | CalcEmissionProbability(const G4Fragment & aFragment) |
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78 | { |
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79 | // If theCoulombBarrier effect is included in the emission probabilities |
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80 | //if (GetMaximalKineticEnergy() <= 0.0) |
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81 | G4double limit; |
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82 | if(OPTxs==0 || useSICB) limit= theCoulombBarrier; |
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83 | else limit=0.; |
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84 | if (GetMaximalKineticEnergy() <= limit) |
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85 | { |
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86 | theEmissionProbability = 0.0; |
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87 | return 0.0; |
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88 | } |
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89 | // If theCoulombBarrier effect is included in the emission probabilities |
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90 | // G4double LowerLimit = 0.; |
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91 | // Coulomb barrier is the lower limit |
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92 | // of integration over kinetic energy |
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93 | G4double LowerLimit = limit; |
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94 | |
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95 | // Excitation energy of nucleus after fragment emission is the upper limit of integration over kinetic energy |
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96 | G4double UpperLimit = GetMaximalKineticEnergy(); |
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97 | |
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98 | theEmissionProbability = |
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99 | IntegrateEmissionProbability(LowerLimit,UpperLimit,aFragment); |
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100 | return theEmissionProbability; |
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101 | } |
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102 | |
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103 | G4double G4PreCompoundFragment:: |
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104 | IntegrateEmissionProbability(const G4double & Low, const G4double & Up, |
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105 | const G4Fragment & aFragment) |
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106 | { |
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107 | static const G4int N = 10; |
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108 | // 10-Points Gauss-Legendre abcisas and weights |
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109 | static const G4double w[N] = { |
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110 | 0.0666713443086881, |
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111 | 0.149451349150581, |
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112 | 0.219086362515982, |
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113 | 0.269266719309996, |
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114 | 0.295524224714753, |
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115 | 0.295524224714753, |
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116 | 0.269266719309996, |
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117 | 0.219086362515982, |
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118 | 0.149451349150581, |
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119 | 0.0666713443086881 |
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120 | }; |
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121 | static const G4double x[N] = { |
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122 | -0.973906528517172, |
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123 | -0.865063366688985, |
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124 | -0.679409568299024, |
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125 | -0.433395394129247, |
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126 | -0.148874338981631, |
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127 | 0.148874338981631, |
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128 | 0.433395394129247, |
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129 | 0.679409568299024, |
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130 | 0.865063366688985, |
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131 | 0.973906528517172 |
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132 | }; |
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133 | |
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134 | G4double Total = 0.0; |
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135 | |
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136 | |
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137 | for (G4int i = 0; i < N; i++) |
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138 | { |
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139 | G4double KineticE = ((Up-Low)*x[i]+(Up+Low))/2.0; |
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140 | Total += w[i]*ProbabilityDistributionFunction(KineticE, aFragment); |
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141 | } |
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142 | Total *= (Up-Low)/2.0; |
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143 | return Total; |
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144 | } |
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145 | |
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146 | |
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147 | |
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148 | |
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149 | G4double G4PreCompoundFragment:: |
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150 | GetKineticEnergy(const G4Fragment & aFragment) |
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151 | { |
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152 | |
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153 | // G4double V = this->GetCoulombBarrier();// alternative way for accessing the Coulomb barrier |
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154 | // //should be equivalent (in fact it is) |
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155 | G4double V; |
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156 | if(OPTxs==0 || useSICB) V= theCoulombBarrier;//let's keep this way for consistency with CalcEmissionProbability method |
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157 | else V=0.; |
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158 | |
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159 | G4double Tmax = GetMaximalKineticEnergy() ; |
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160 | G4double T(0.0); |
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161 | G4double NormalizedProbability(1.0); |
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162 | do |
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163 | { |
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164 | T =V+ G4UniformRand()*(Tmax-V); |
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165 | NormalizedProbability = ProbabilityDistributionFunction(T,aFragment)/GetEmissionProbability(); |
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166 | } while (G4UniformRand() > NormalizedProbability); |
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167 | return T; |
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168 | } |
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