1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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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 1.9 2010/08/28 15:16:55 vnivanch Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-03-ref-09 $ |
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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 | // |
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32 | // Modified: |
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33 | // 06.09.2008 JMQ Also external choice has been added for: |
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34 | // - superimposed Coulomb barrier (if useSICB=true) |
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35 | // 20.08.2010 V.Ivanchenko cleanup |
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36 | // |
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37 | |
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38 | #include "G4PreCompoundFragment.hh" |
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39 | |
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40 | G4PreCompoundFragment:: |
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41 | G4PreCompoundFragment(const G4ParticleDefinition* part, |
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42 | G4VCoulombBarrier* aCoulombBarrier) |
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43 | : G4VPreCompoundFragment(part,aCoulombBarrier) |
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44 | {} |
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45 | |
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46 | G4PreCompoundFragment::~G4PreCompoundFragment() |
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47 | {} |
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48 | |
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49 | G4double G4PreCompoundFragment:: |
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50 | CalcEmissionProbability(const G4Fragment & aFragment) |
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51 | { |
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52 | //G4cout << theCoulombBarrier << " " << GetMaximalKineticEnergy() << G4endl; |
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53 | // If theCoulombBarrier effect is included in the emission probabilities |
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54 | //if (GetMaximalKineticEnergy() <= 0.0) |
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55 | G4double limit = 0.0; |
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56 | if(OPTxs==0 || useSICB) { limit = theCoulombBarrier; } |
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57 | if (GetMaximalKineticEnergy() <= limit) |
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58 | { |
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59 | theEmissionProbability = 0.0; |
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60 | return 0.0; |
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61 | } |
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62 | // If theCoulombBarrier effect is included in the emission probabilities |
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63 | // G4double LowerLimit = 0.; |
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64 | // Coulomb barrier is the lower limit |
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65 | // of integration over kinetic energy |
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66 | G4double LowerLimit = limit; |
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67 | |
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68 | // Excitation energy of nucleus after fragment emission is the upper |
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69 | //limit of integration over kinetic energy |
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70 | G4double UpperLimit = GetMaximalKineticEnergy(); |
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71 | |
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72 | theEmissionProbability = |
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73 | IntegrateEmissionProbability(LowerLimit,UpperLimit,aFragment); |
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74 | /* |
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75 | G4cout << "## G4PreCompoundFragment::CalcEmisProb " |
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76 | << "Z= " << aFragment.GetZ_asInt() |
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77 | << " A= " << aFragment.GetA_asInt() |
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78 | << " Elow= " << LowerLimit/MeV |
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79 | << " Eup= " << UpperLimit/MeV |
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80 | << " prob= " << theEmissionProbability |
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81 | << G4endl; |
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82 | */ |
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83 | return theEmissionProbability; |
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84 | } |
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85 | |
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86 | G4double G4PreCompoundFragment:: |
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87 | IntegrateEmissionProbability(G4double Low, G4double Up, |
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88 | const G4Fragment & aFragment) |
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89 | { |
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90 | static const G4int N = 10; |
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91 | // 10-Points Gauss-Legendre abcisas and weights |
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92 | static const G4double w[N] = { |
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93 | 0.0666713443086881, |
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94 | 0.149451349150581, |
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95 | 0.219086362515982, |
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96 | 0.269266719309996, |
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97 | 0.295524224714753, |
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98 | 0.295524224714753, |
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99 | 0.269266719309996, |
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100 | 0.219086362515982, |
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101 | 0.149451349150581, |
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102 | 0.0666713443086881 |
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103 | }; |
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104 | static const G4double x[N] = { |
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105 | -0.973906528517172, |
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106 | -0.865063366688985, |
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107 | -0.679409568299024, |
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108 | -0.433395394129247, |
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109 | -0.148874338981631, |
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110 | 0.148874338981631, |
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111 | 0.433395394129247, |
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112 | 0.679409568299024, |
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113 | 0.865063366688985, |
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114 | 0.973906528517172 |
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115 | }; |
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116 | |
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117 | G4double Total = 0.0; |
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118 | |
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119 | for (G4int i = 0; i < N; ++i) |
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120 | { |
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121 | G4double KineticE = 0.5*((Up-Low)*x[i]+(Up+Low)); |
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122 | Total += w[i]*ProbabilityDistributionFunction(KineticE, aFragment); |
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123 | } |
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124 | Total *= 0.5*(Up-Low); |
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125 | return Total; |
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126 | } |
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127 | |
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128 | G4double G4PreCompoundFragment:: |
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129 | GetKineticEnergy(const G4Fragment & aFragment) |
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130 | { |
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131 | //let's keep this way for consistency with CalcEmissionProbability method |
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132 | G4double V = 0.0; |
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133 | if(OPTxs==0 || useSICB) { V = theCoulombBarrier; } |
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134 | |
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135 | G4double Tmax = GetMaximalKineticEnergy(); |
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136 | if(Tmax < V) { return 0.0; } |
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137 | G4double T(0.0); |
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138 | G4double Probability(1.0); |
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139 | G4double maxProbability = GetEmissionProbability(); |
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140 | do |
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141 | { |
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142 | T = V + G4UniformRand()*(Tmax-V); |
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143 | Probability = ProbabilityDistributionFunction(T,aFragment); |
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144 | } while (maxProbability*G4UniformRand() > Probability); |
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145 | return T; |
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146 | } |
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