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2 | // ******************************************************************** |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: G4FissionProbability.cc,v 1.9 2009/02/15 17:03:25 vnivanch Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-04-beta-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 | // J.M.Quesada (14 february 2009) bug fixed in fission width: missing parenthesis in the denominator |
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35 | |
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36 | |
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37 | #include "G4FissionProbability.hh" |
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38 | #include "G4PairingCorrection.hh" |
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39 | |
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40 | |
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41 | |
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42 | G4FissionProbability::G4FissionProbability(const G4FissionProbability &) : G4VEmissionProbability() |
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43 | { |
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44 | throw G4HadronicException(__FILE__, __LINE__, "G4FissionProbability::copy_constructor meant to not be accessable"); |
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45 | } |
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46 | |
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47 | |
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48 | |
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49 | |
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50 | const G4FissionProbability & G4FissionProbability::operator=(const G4FissionProbability &) |
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51 | { |
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52 | throw G4HadronicException(__FILE__, __LINE__, "G4FissionProbability::operator= meant to not be accessable"); |
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53 | return *this; |
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54 | } |
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55 | |
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56 | |
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57 | G4bool G4FissionProbability::operator==(const G4FissionProbability &) const |
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58 | { |
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59 | return false; |
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60 | } |
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61 | |
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62 | G4bool G4FissionProbability::operator!=(const G4FissionProbability &) const |
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63 | { |
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64 | return true; |
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65 | } |
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66 | |
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67 | |
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68 | G4double G4FissionProbability::EmissionProbability(const G4Fragment & fragment, const G4double MaximalKineticEnergy) |
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69 | // Compute integrated probability of fission channel |
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70 | { |
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71 | if (MaximalKineticEnergy <= 0.0) return 0.0; |
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72 | G4double A = fragment.GetA(); |
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73 | G4double Z = fragment.GetZ(); |
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74 | G4double U = fragment.GetExcitationEnergy(); |
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75 | |
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76 | G4double Ucompound = U - G4PairingCorrection::GetInstance()->GetPairingCorrection(static_cast<G4int>(A), |
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77 | static_cast<G4int>(Z)); |
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78 | G4double Ufission = U - G4PairingCorrection::GetInstance()->GetFissionPairingCorrection(static_cast<G4int>(A), |
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79 | static_cast<G4int>(Z)); |
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80 | |
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81 | G4double SystemEntropy = 2.0*std::sqrt(theEvapLDP.LevelDensityParameter(static_cast<G4int>(A), |
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82 | static_cast<G4int>(Z), |
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83 | Ucompound)*Ucompound); |
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84 | |
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85 | G4double afission = theFissLDP.LevelDensityParameter(static_cast<G4int>(A), |
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86 | static_cast<G4int>(Z), |
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87 | Ufission); |
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88 | |
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89 | G4double Cf = 2.0*std::sqrt(afission*MaximalKineticEnergy); |
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90 | |
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91 | // G4double Q1 = 1.0 + (Cf - 1.0)*std::exp(Cf); |
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92 | // G4double Q2 = 4.0*pi*afission*std::exp(SystemEntropy); |
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93 | |
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94 | // G4double probability = Q1/Q2; |
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95 | |
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96 | |
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97 | G4double Exp1 = 0.0; |
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98 | if (SystemEntropy <= 160.0) Exp1 = std::exp(-SystemEntropy); |
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99 | // @@@@@@@@@@@@@@@@@ hpw changed max to min - cannot notify vicente now |
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100 | G4double Exp2 = std::exp( std::min(700.0,Cf-SystemEntropy) ); |
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101 | |
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102 | // JMQ 14/02/09 BUG fixed in fission probability (missing parenthesis at denominator) |
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103 | //AH fix from Vincente: G4double probability = (Exp1 + (1.0-Cf)*Exp2) / 4.0*pi*afission; |
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104 | // G4double probability = (Exp1 + (Cf-1.0)*Exp2) / 4.0*pi*afission; |
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105 | G4double probability = (Exp1 + (Cf-1.0)*Exp2) / (4.0*pi*afission); |
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106 | |
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107 | |
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108 | |
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109 | return probability; |
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110 | } |
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111 | |
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