1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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11 | // * Neither the authors of this software system, nor their employing * |
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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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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 | // $Id: G4FissionBarrier.cc,v 1.5 2006/06/29 20:13:35 gunter Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-03-cand-01 $ |
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29 | // |
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30 | // Hadronic Process: Nuclear De-excitations |
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31 | // by V. Lara (Oct 1998) |
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32 | |
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33 | |
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34 | #include "G4FissionBarrier.hh" |
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35 | |
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36 | G4FissionBarrier::G4FissionBarrier(const G4FissionBarrier & ) : G4VFissionBarrier() |
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37 | { |
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38 | throw G4HadronicException(__FILE__, __LINE__, "G4FissionBarrier::copy_constructor meant to not be accessable."); |
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39 | } |
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40 | |
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41 | |
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42 | const G4FissionBarrier & G4FissionBarrier::operator=(const G4FissionBarrier & ) |
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43 | { |
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44 | throw G4HadronicException(__FILE__, __LINE__, "G4FissionBarrier::operator= meant to not be accessable."); |
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45 | return *this; |
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46 | } |
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47 | |
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48 | G4bool G4FissionBarrier::operator==(const G4FissionBarrier & ) const |
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49 | { |
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50 | return false; |
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51 | } |
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52 | |
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53 | G4bool G4FissionBarrier::operator!=(const G4FissionBarrier & ) const |
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54 | { |
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55 | return true; |
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56 | } |
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57 | |
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58 | |
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59 | |
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60 | G4double G4FissionBarrier::FissionBarrier(const G4int A, const G4int Z, const G4double U) |
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61 | // Compute fission barrier according with Barashenkov's prescription for A >= 65 |
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62 | { |
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63 | if (A >= 65) return BarashenkovFissionBarrier(A,Z)/(1.0 + std::sqrt(U/(2.0*static_cast<G4double>(A)))); |
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64 | else return 100.0*GeV; |
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65 | } |
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66 | |
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67 | |
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68 | G4double G4FissionBarrier::BarashenkovFissionBarrier(const G4int A, const G4int Z) |
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69 | // Calculates Fission Barrier heights |
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70 | { |
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71 | // Liquid drop model parameters for |
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72 | // surface energy of a spherical nucleus |
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73 | const G4double aSurf = 17.9439*MeV; |
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74 | // and coulomb energy |
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75 | const G4double aCoul = 0.7053*MeV; |
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76 | const G4int N = A - Z; |
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77 | const G4double k = 1.7826; |
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78 | |
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79 | // fissibility parameter |
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80 | G4double x = (aCoul/(2.0*aSurf))*(static_cast<G4double>(Z)*static_cast<G4double>(Z))/static_cast<G4double>(A); |
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81 | x /= (1.0 - k*(static_cast<G4double>(N-Z)/static_cast<G4double>(A))* |
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82 | (static_cast<G4double>(N-Z)/static_cast<G4double>(A))); |
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83 | |
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84 | // Liquid drop model part of Fission Barrier |
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85 | G4double BF0 = aSurf*std::pow(static_cast<G4double>(A),2./3.); |
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86 | if (x <= 2./3.) BF0 *= 0.38*(3./4.-x); |
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87 | else BF0 *= 0.83*(1. - x)*(1. - x)*(1. - x); |
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88 | |
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89 | |
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90 | // |
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91 | G4double D = 1.248*MeV; |
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92 | D *= (static_cast<G4double>(N)-2.0*(N/2)) + (static_cast<G4double>(Z)-2.0*(Z/2)); |
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93 | |
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94 | return BF0 + D - SellPlusPairingCorrection(Z,N); |
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95 | } |
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96 | |
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