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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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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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13 | // * work make any representation or warranty, express or implied, * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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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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21 | // * any work based on the software) you agree to acknowledge its * |
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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: G4HETCNeutron.cc,v 1.3 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 | // by V. Lara |
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30 | // |
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31 | // Modified: |
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32 | // 23.08.2010 V.Ivanchenko general cleanup, move constructor and destructor |
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33 | // the source, use G4Pow |
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34 | |
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35 | #include "G4HETCNeutron.hh" |
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36 | #include "G4Neutron.hh" |
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37 | |
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38 | G4HETCNeutron::G4HETCNeutron() |
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39 | : G4HETCFragment(G4Neutron::Neutron(), &theNeutronCoulombBarrier) |
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40 | {} |
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41 | |
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42 | G4HETCNeutron::~G4HETCNeutron() |
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43 | {} |
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44 | |
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45 | G4double G4HETCNeutron::GetAlpha() |
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46 | { |
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47 | return 0.76+2.2/g4pow->Z13(GetRestA()); |
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48 | } |
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49 | |
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50 | G4double G4HETCNeutron::GetBeta() |
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51 | { |
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52 | return (2.12/g4pow->Z23(GetRestA())-0.05)*MeV/GetAlpha(); |
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53 | } |
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54 | |
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55 | G4double G4HETCNeutron::GetSpinFactor() |
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56 | { |
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57 | // (2s+1) |
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58 | return 2.0; |
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59 | } |
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60 | |
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61 | G4double G4HETCNeutron::K(const G4Fragment & aFragment) |
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62 | { |
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63 | // Number of protons in emitted fragment |
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64 | G4int Pa = GetZ(); |
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65 | // Number of neutrons in emitted fragment |
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66 | G4int Na = GetA() - Pa; |
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67 | |
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68 | G4int TargetZ = GetRestZ(); |
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69 | G4int TargetA = GetRestA(); |
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70 | G4double r = G4double(TargetZ)/G4double(TargetA); |
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71 | |
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72 | G4int P = aFragment.GetNumberOfParticles(); |
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73 | G4int H = aFragment.GetNumberOfHoles(); |
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74 | |
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75 | G4double result = 0.0; |
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76 | if (P > 0) |
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77 | { |
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78 | result = (H + Na/(1.0-r))/P; |
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79 | } |
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80 | |
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81 | return std::max(0.0,result); |
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82 | } |
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83 | |
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84 | G4double G4HETCNeutron::GetKineticEnergy(const G4Fragment & aFragment) |
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85 | { |
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86 | G4int H = aFragment.GetNumberOfHoles(); |
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87 | G4int Pb = aFragment.GetNumberOfParticles(); |
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88 | G4int Nb = Pb + H; |
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89 | G4double g0 = (6.0/pi2)*aFragment.GetA_asInt()*theParameters->GetLevelDensity(); |
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90 | |
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91 | G4double Ab = std::max(0.0,G4double(Pb*Pb+H*H+Pb-3*H)/(4.0*g0)); |
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92 | G4double Emax = GetMaximalKineticEnergy() - Ab; |
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93 | |
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94 | G4double cut = GetBeta() / (GetBeta()+Emax/G4double(Nb+1)); |
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95 | G4double x(0.0); |
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96 | if (G4UniformRand() <= cut) |
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97 | { |
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98 | x = BetaRand(Nb,1); |
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99 | } |
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100 | else |
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101 | { |
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102 | x = BetaRand(Nb,2); |
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103 | } |
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104 | |
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105 | return Emax * (1.0 - x); |
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106 | } |
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