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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: G4FissionParameters.cc,v 1.7 2009/11/19 10:30:49 vnivanch 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 | //J. M. Quesada (May 2009): sigma_sym (SigmaS) tuned for spallation data. |
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34 | //J. M. Quesada (30.10.09): retuning for IAEA spallation data |
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35 | |
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36 | #include "G4FissionParameters.hh" |
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37 | #include "G4HadronicException.hh" |
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38 | |
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39 | |
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40 | const G4double G4FissionParameters::A1 = 134.0; |
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41 | const G4double G4FissionParameters::A2 = 141.0; |
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42 | |
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43 | |
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44 | G4FissionParameters::G4FissionParameters(const G4int A, const G4int Z, const G4double ExEnergy, |
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45 | const G4double FissionBarrier) |
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46 | { |
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47 | G4double U = ExEnergy; |
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48 | |
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49 | As = A/2.0; |
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50 | |
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51 | if (A <= 235) Sigma2 = 5.6; // MeV |
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52 | else Sigma2 = 5.6 + 0.096*(A-235); // MeV |
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53 | |
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54 | Sigma1 = 0.5*Sigma2; // MeV |
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55 | |
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56 | SigmaS = std::exp(0.00553*U/MeV + 2.1386); // MeV |
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57 | |
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58 | //JMQ 310509 |
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59 | // if (SigmaS > 20.0) SigmaS = 20.0; |
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60 | // SigmaS*=1.3; |
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61 | //JMQ 301009: retuning (after CEM transition prob.have been chosen as default) |
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62 | SigmaS*=0.8; |
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63 | // |
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64 | |
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65 | G4double FasymAsym = 2.0*std::exp(-((A2-As)*(A2-As))/(2.0*Sigma2*Sigma2)) + |
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66 | std::exp(-((A1-As)*(A1-As))/(2.0*Sigma1*Sigma1)); |
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67 | |
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68 | G4double FsymA1A2 = std::exp(-((As-(A1+A2)/2.0)*(As-(A1+A2)/2.0))/(2.0*SigmaS*SigmaS)); |
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69 | |
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70 | |
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71 | G4double wa = 0.0; |
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72 | w = 0.0; |
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73 | if (Z >= 90) { // Z >= 90 |
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74 | if (U <= 16.25) wa = std::exp(0.5385*U/MeV-9.9564); // U <= 16.25 MeV |
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75 | else wa = std::exp(0.09197*U/MeV-2.7003); // U > 16.25 MeV |
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76 | } else if (Z == 89) { // Z == 89 |
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77 | wa = std::exp(0.09197*U-1.0808); |
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78 | } else if (Z >= 82) { // 82 <= Z <= 88 |
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79 | G4double X = FissionBarrier - 7.5*MeV; |
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80 | if (X < 0.0) X = 0.0; |
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81 | wa = std::exp(0.09197*(U-X)/MeV-1.0808); |
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82 | } else { // Z < 82 |
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83 | w = 1001.0; |
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84 | } |
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85 | |
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86 | if (w == 0.0) { |
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87 | G4double w1 = std::max(1.03*wa - FasymAsym, 0.0001); |
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88 | G4double w2 = std::max(1.0 - FsymA1A2*wa, 0.0001); |
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89 | |
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90 | w = w1/w2; |
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91 | |
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92 | if (82 <= Z && Z < 89 && A < 227) w *= std::exp(0.3*(227-A)); |
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93 | } |
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94 | |
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95 | } |
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96 | |
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97 | |
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98 | G4FissionParameters::G4FissionParameters(const G4FissionParameters &) |
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99 | { |
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100 | throw G4HadronicException(__FILE__, __LINE__, "G4FissionParameters::copy_constructor meant to not be accessable"); |
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101 | } |
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102 | |
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103 | |
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104 | const G4FissionParameters & G4FissionParameters::operator=(const G4FissionParameters &) |
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105 | { |
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106 | throw G4HadronicException(__FILE__, __LINE__, "G4FissionParameters::operator= meant to not be accessable"); |
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107 | return *this; |
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108 | } |
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109 | |
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110 | |
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111 | G4bool G4FissionParameters::operator==(const G4FissionParameters &) const |
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112 | { |
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113 | return false; |
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114 | } |
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115 | |
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116 | G4bool G4FissionParameters::operator!=(const G4FissionParameters &) const |
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117 | { |
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118 | return true; |
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119 | } |
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120 | |
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121 | |
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