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 | // |
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27 | // ------------------------------------------------------------------- |
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28 | // GEANT 4 class implementation file |
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29 | // |
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30 | // CERN, Geneva, Switzerland |
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31 | // |
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32 | // File name: G4NeutronField.cc |
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33 | // |
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34 | // Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it) |
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35 | // |
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36 | // Creation date: 5 June 2000 |
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37 | // ------------------------------------------------------------------- |
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38 | #include "G4NeutronField.hh" |
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39 | #include "G4VNuclearDensity.hh" |
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40 | #include "G4FermiMomentum.hh" |
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41 | |
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42 | |
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43 | G4NeutronField::G4NeutronField(G4V3DNucleus * aNucleus) : |
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44 | G4VNuclearField(aNucleus), theDensity(theNucleus->GetNuclearDensity()) |
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45 | { |
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46 | theA = theNucleus->GetMassNumber(); |
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47 | theZ = theNucleus->GetCharge(); |
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48 | theFermi.Init(theA, theZ); |
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49 | theR = 2.*theNucleus->GetOuterRadius(); |
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50 | G4double aR=0; |
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51 | while(aR<theR) |
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52 | { |
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53 | G4ThreeVector aPosition(0,0,aR); |
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54 | G4double density = GetDensity(aPosition); |
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55 | G4double fermiMom = GetFermiMomentum(density); |
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56 | theFermiMomBuffer.push_back(fermiMom); |
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57 | aR+=0.3*fermi; |
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58 | } |
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59 | { |
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60 | G4ThreeVector aPosition(0,0,theR); |
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61 | G4double density = GetDensity(aPosition); |
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62 | G4double fermiMom = GetFermiMomentum(density); |
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63 | theFermiMomBuffer.push_back(fermiMom); |
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64 | } |
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65 | { |
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66 | G4ThreeVector aPosition(0,0,theR+0.001*fermi); |
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67 | theFermiMomBuffer.push_back(0); |
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68 | } |
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69 | { |
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70 | G4ThreeVector aPosition(0,0,1.*m); |
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71 | theFermiMomBuffer.push_back(0); |
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72 | } |
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73 | } |
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74 | |
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75 | G4NeutronField::~G4NeutronField() |
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76 | { } |
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77 | |
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78 | |
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79 | const G4NeutronField & G4NeutronField::operator=(const G4NeutronField &) |
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80 | { |
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81 | throw G4HadronicException(__FILE__, __LINE__, "G4NeutronField::operator= meant not to be accessible"); |
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82 | return *this; |
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83 | } |
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84 | |
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85 | |
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86 | G4int G4NeutronField::operator==(const G4NeutronField &) const |
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87 | { |
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88 | throw G4HadronicException(__FILE__, __LINE__, "G4NeutronField::operator== meant not to be accessible"); |
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89 | return 0; |
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90 | } |
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91 | |
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92 | |
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93 | G4int G4NeutronField::operator!=(const G4NeutronField &) const |
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94 | { |
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95 | throw G4HadronicException(__FILE__, __LINE__, "G4NeutronField::operator!= meant not to be accessible"); |
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96 | return 1; |
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97 | } |
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98 | |
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99 | |
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100 | G4double G4NeutronField::GetField(const G4ThreeVector & aPosition) |
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101 | { |
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102 | G4double x = aPosition.mag(); |
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103 | G4int index = static_cast<G4int>(x/(0.3*fermi) ); |
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104 | if(index+2> static_cast<G4int>(theFermiMomBuffer.size())) return theFermiMomBuffer.back(); |
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105 | G4double y1 = theFermiMomBuffer[index]; |
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106 | G4double y2 = theFermiMomBuffer[index+1]; |
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107 | G4double x1 = (0.3*fermi)*index; |
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108 | G4double x2 = (0.3*fermi)*(index+1); |
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109 | G4double fermiMom = y1 + (x-x1)*(y2-y1)/(x2-x1); |
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110 | return -1*(fermiMom*fermiMom)/(2*neutron_mass_c2); |
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111 | } |
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112 | |
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113 | |
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114 | |
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115 | G4double G4NeutronField::GetBarrier() |
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116 | { |
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117 | /* |
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118 | * G4double A = theNucleus->GetMassNumber(); |
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119 | * G4double Z = theNucleus->GetCharge(); |
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120 | * |
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121 | * return G4NucleiPropertiesTable::GetBindingEnergy(Z, A)/A; |
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122 | */ |
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123 | return 0.; |
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124 | } |
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125 | |
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126 | |
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127 | |
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128 | |
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129 | |
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130 | |
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