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 | // by V. Lara |
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27 | |
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28 | #include "G4HETCFragment.hh" |
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29 | #include "G4PreCompoundParameters.hh" |
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30 | |
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31 | G4HETCFragment:: |
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32 | G4HETCFragment(const G4HETCFragment & right) : |
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33 | G4VPreCompoundFragment(right) |
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34 | { |
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35 | } |
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36 | |
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37 | G4HETCFragment:: |
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38 | G4HETCFragment(const G4double anA, |
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39 | const G4double aZ, |
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40 | G4VCoulombBarrier* aCoulombBarrier, |
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41 | const G4String & aName) : |
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42 | G4VPreCompoundFragment(anA,aZ,aCoulombBarrier,aName) |
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43 | {} |
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44 | |
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45 | G4HETCFragment::~G4HETCFragment() |
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46 | { |
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47 | } |
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48 | |
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49 | const G4HETCFragment & G4HETCFragment:: |
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50 | operator= (const G4HETCFragment & right) |
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51 | { |
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52 | if (&right != this) this->G4VPreCompoundFragment::operator=(right); |
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53 | return *this; |
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54 | } |
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55 | |
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56 | G4int G4HETCFragment::operator==(const G4HETCFragment & right) const |
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57 | { |
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58 | return G4VPreCompoundFragment::operator==(right); |
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59 | } |
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60 | |
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61 | G4int G4HETCFragment::operator!=(const G4HETCFragment & right) const |
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62 | { |
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63 | return G4VPreCompoundFragment::operator!=(right); |
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64 | } |
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65 | |
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66 | |
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67 | |
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68 | G4double G4HETCFragment:: |
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69 | CalcEmissionProbability(const G4Fragment & aFragment) |
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70 | { |
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71 | if (GetEnergyThreshold() <= 0.0) |
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72 | { |
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73 | theEmissionProbability = 0.0; |
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74 | return 0.0; |
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75 | } |
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76 | // Coulomb barrier is the lower limit |
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77 | // of integration over kinetic energy |
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78 | G4double LowerLimit = theCoulombBarrier; |
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79 | |
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80 | // Excitation energy of nucleus after fragment emission is the upper limit |
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81 | // of integration over kinetic energy |
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82 | G4double UpperLimit = this->GetMaximalKineticEnergy(); |
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83 | |
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84 | theEmissionProbability = IntegrateEmissionProbability(LowerLimit,UpperLimit,aFragment); |
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85 | |
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86 | return theEmissionProbability; |
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87 | } |
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88 | |
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89 | G4double G4HETCFragment:: |
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90 | IntegrateEmissionProbability(const G4double & Low, const G4double & Up, |
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91 | const G4Fragment & aFragment) |
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92 | { |
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93 | |
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94 | if ( !IsItPossible(aFragment) ) return 0.0; |
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95 | |
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96 | const G4double r0 = G4PreCompoundParameters::GetAddress()->Getr0(); |
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97 | |
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98 | G4double U = aFragment.GetExcitationEnergy(); |
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99 | G4double P = aFragment.GetNumberOfParticles(); |
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100 | G4double H = aFragment.GetNumberOfHoles(); |
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101 | G4double N = P + H; |
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102 | G4double Pb = P - GetA(); |
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103 | G4double Nb = Pb + H; |
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104 | if (Nb <= 0.0) return 0.0; |
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105 | |
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106 | G4double A = (P*P+H*H+P-3*H)/4.0; |
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107 | G4double Ab = (Pb*Pb+H*H+Pb-3*H)/4.0; |
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108 | U = std::max(U-A,0.0); |
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109 | if (U <= 0.0) return 0.0; |
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110 | |
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111 | G4double g = (6.0/pi2)*aFragment.GetA()*G4PreCompoundParameters::GetAddress()->GetLevelDensity(); |
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112 | G4double gb = (6.0/pi2)*GetRestA()*G4PreCompoundParameters::GetAddress()->GetLevelDensity(); |
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113 | |
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114 | G4double Pf = P; |
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115 | G4double Hf = H; |
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116 | G4double Nf = N-1.0; |
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117 | for (G4int i = 1; i < GetA(); i++) |
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118 | { |
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119 | Pf *= (P-i); |
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120 | Hf *= (H-i); |
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121 | Nf *= (N-1-i); |
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122 | } |
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123 | |
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124 | G4double X = std::max(Up - Ab + GetBeta(),0.0); |
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125 | G4double Y = std::max(Up - Ab - Low, 0.0); |
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126 | |
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127 | G4double Probability = GetSpinFactor()/(pi*hbarc*hbarc*hbarc) * GetReducedMass() * GetAlpha() * |
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128 | r0 * r0 * std::pow(GetRestA(),2.0/3.0)/std::pow(U,N-1) * (std::pow(gb,Nb)/std::pow(g,N)) * Pf * Hf * Nf * K(aFragment) * |
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129 | std::pow(Y,Nb) * (X/Nb - Y/(Nb+1)); |
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130 | |
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131 | return Probability; |
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132 | } |
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