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 | // $Id: G4RegionModel.cc,v 1.16 2010/03/19 05:03:23 mkelsey Exp $ |
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26 | // Geant4 tag: $Name: geant4-09-04-beta-cand-01 $ |
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27 | // |
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28 | // 20100319 M. Kelsey -- Eliminate unnecessary use of std::pow() |
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29 | |
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30 | #include "G4RegionModel.hh" |
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31 | #include "G4HadronicException.hh" |
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32 | #include "G4InuclSpecialFunctions.hh" |
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33 | |
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34 | using namespace G4InuclSpecialFunctions; |
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35 | |
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36 | const G4double G4RegionModel::radius0 = 1.0E-15; |
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37 | const G4double G4RegionModel::BE = 7; |
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38 | |
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39 | G4RegionModel::G4RegionModel(const G4int numberOfLayers, const G4int A, const G4int Z) |
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40 | { |
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41 | //count the radiuses, densities and fermi momenta with A and Z |
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42 | G4double r = radius0*G4cbrt(A); |
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43 | |
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44 | if(numberOfLayers==1){ |
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45 | radius.push_back(r); |
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46 | |
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47 | G4double vol = 4.0/3.0 * pi * r*r*r; |
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48 | G4double rho = G4double(A) / vol; |
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49 | density.push_back(rho); |
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50 | |
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51 | G4double protonMass = G4Proton::Proton()->GetPDGMass(); |
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52 | G4double neutronMass = G4Neutron::Neutron()->GetPDGMass(); |
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53 | G4double protonDensity = G4double(Z) / vol; |
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54 | G4double neutronDensity = G4double(A-Z) / vol; |
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55 | |
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56 | protonFermiEnergy.push_back(GetFermiEnergy(protonDensity, protonMass)); |
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57 | neutronFermiEnergy.push_back(GetFermiEnergy(neutronDensity, neutronMass)); |
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58 | |
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59 | protonFermiMomentum.push_back(GetFermiMomentum(protonDensity, protonMass)); |
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60 | neutronFermiMomentum.push_back(GetFermiMomentum(neutronDensity, neutronMass)); |
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61 | |
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62 | G4double fermiEP = *protonFermiEnergy.begin(); |
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63 | G4double fermiEN = *neutronFermiEnergy.begin(); |
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64 | protonPotentialEnergy.push_back(-(fermiEP + BE)); |
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65 | neutronPotentialEnergy.push_back(-(fermiEN + BE)); |
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66 | } |
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67 | else{ |
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68 | if(numberOfLayers==3){ |
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69 | radius.push_back(0.1*r); |
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70 | radius.push_back(0.2*r); |
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71 | radius.push_back(0.9*r); |
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72 | |
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73 | } |
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74 | } |
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75 | } |
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76 | |
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77 | G4RegionModel::~G4RegionModel(){} |
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78 | |
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79 | G4double G4RegionModel::GetDensity(G4double r){ |
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80 | my_iterator j=density.begin(); |
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81 | for(my_iterator i=radius.begin(); i<radius.end(); i++){ |
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82 | if(r <= *i) return *j; |
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83 | j++; |
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84 | } |
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85 | return 0; |
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86 | } |
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87 | |
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88 | G4double G4RegionModel::GetPotentialEnergy(G4double r, G4int particle){ |
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89 | if(particle == 0){ //proton |
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90 | my_iterator j=protonPotentialEnergy.begin(); |
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91 | for(my_iterator i=radius.begin(); i<radius.end(); i++){ |
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92 | if(r <= *i) return *j; |
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93 | j++; |
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94 | } |
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95 | return 0; |
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96 | } |
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97 | |
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98 | if(particle == 1){ //neutron |
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99 | my_iterator j=neutronPotentialEnergy.begin(); |
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100 | for(my_iterator i=radius.begin(); i<radius.end(); i++){ |
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101 | if(r <= *i) return *j; |
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102 | j++; |
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103 | } |
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104 | return 0; |
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105 | } |
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106 | return 0; |
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107 | } |
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108 | |
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109 | G4double G4RegionModel::GetMaximumNucleonMomentum(G4double r, |
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110 | G4int nucleon){ |
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111 | if(nucleon == 0){ |
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112 | my_iterator j=protonFermiMomentum.begin(); |
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113 | for(my_iterator i=radius.begin(); i<radius.end(); i++){ |
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114 | if(r <= *i) return *j; |
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115 | j++; |
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116 | } |
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117 | } |
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118 | if(nucleon==1){ |
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119 | my_iterator j=neutronFermiMomentum.begin(); |
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120 | for(my_iterator i=radius.begin(); i<radius.end(); i++){ |
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121 | if(r <= *i) return *j; |
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122 | j++; |
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123 | } |
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124 | } |
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125 | throw G4HadronicException(__FILE__, __LINE__, "G4RegionModel::GetMaximumNucleonMomentum - return value undefined"); |
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126 | return 0; |
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127 | |
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128 | } |
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129 | |
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130 | G4double G4RegionModel::GetFermiMomentum(G4double aDensity, |
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131 | G4double aMass){ |
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132 | return std::sqrt(2*aMass*GetFermiEnergy(aDensity, aMass)); |
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133 | } |
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134 | |
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135 | G4double G4RegionModel::GetFermiEnergy(G4double aDensity, |
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136 | G4double aMass){ |
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137 | G4double densFactor = G4cbrt(3.0*pi2*aDensity); // 2/3 power |
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138 | densFactor *= densFactor; |
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139 | |
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140 | return hbar_Planck*hbar_Planck/(2.0*aMass) * densFactor; |
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141 | } |
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