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 | // Hadronic Process: Nuclear De-excitations |
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27 | // by V. Lara |
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28 | |
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29 | inline G4FermiPhaseSpaceDecay::G4FermiPhaseSpaceDecay() |
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30 | { |
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31 | } |
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32 | |
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33 | inline G4FermiPhaseSpaceDecay::~G4FermiPhaseSpaceDecay() |
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34 | { |
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35 | } |
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36 | |
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37 | inline G4FermiPhaseSpaceDecay::G4FermiPhaseSpaceDecay(const G4FermiPhaseSpaceDecay&) |
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38 | { |
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39 | // This is meant to not be used |
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40 | } |
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41 | |
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42 | inline const G4FermiPhaseSpaceDecay & |
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43 | G4FermiPhaseSpaceDecay::operator=(const G4FermiPhaseSpaceDecay&) |
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44 | { |
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45 | //This is menat to not be used |
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46 | return *this; |
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47 | } |
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48 | |
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49 | inline G4bool |
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50 | G4FermiPhaseSpaceDecay::operator==(const G4FermiPhaseSpaceDecay&) |
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51 | { |
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52 | // This is meant to not be used |
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53 | return false; |
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54 | } |
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55 | |
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56 | inline G4bool |
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57 | G4FermiPhaseSpaceDecay::operator!=(const G4FermiPhaseSpaceDecay&) |
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58 | { |
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59 | // This is meant to not be used |
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60 | return true; |
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61 | } |
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62 | |
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63 | |
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64 | inline G4double |
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65 | G4FermiPhaseSpaceDecay::PtwoBody(G4double E, G4double P1, G4double P2) const |
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66 | { |
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67 | G4double P = (E+P1+P2)*(E+P1-P2)*(E-P1+P2)*(E-P1-P2)/(4.0*E*E); |
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68 | if (P>0.0) return std::sqrt(P); |
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69 | else return -1.0; |
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70 | } |
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71 | |
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72 | |
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73 | inline std::vector<G4LorentzVector*> * G4FermiPhaseSpaceDecay:: |
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74 | Decay(const G4double parent_mass, const std::vector<G4double>& fragment_masses) const |
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75 | { |
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76 | // if (fragment_masses.size() == 2) |
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77 | // { |
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78 | // return this->TwoBodyDecay(parent_mass,fragment_masses); |
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79 | // } |
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80 | // else return this->NBodyDecay(parent_mass,fragment_masses); |
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81 | // else |
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82 | // { |
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83 | return this->KopylovNBodyDecay(parent_mass,fragment_masses); |
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84 | // } |
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85 | } |
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86 | |
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87 | inline G4double |
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88 | G4FermiPhaseSpaceDecay::BetaKopylov(const G4int K) const |
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89 | { |
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90 | // Notice that alpha > beta always |
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91 | const G4double beta = 1.5; |
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92 | G4double alpha = 1.5*(K-1); |
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93 | G4double Y1 = CLHEP::RandGamma::shoot(alpha,1); |
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94 | G4double Y2 = CLHEP::RandGamma::shoot(beta,1); |
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95 | |
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96 | return Y1/(Y1+Y2); |
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97 | } |
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