[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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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 | // |
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[962] | 27 | // $Id: G4FissionProbability.cc,v 1.9 2009/02/15 17:03:25 vnivanch Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
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[819] | 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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[962] | 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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[819] | 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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[962] | 99 | // @@@@@@@@@@@@@@@@@ hpw changed max to min - cannot notify vicente now |
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[819] | 100 | G4double Exp2 = std::exp( std::min(700.0,Cf-SystemEntropy) ); |
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| 101 | |
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[962] | 102 | // JMQ 14/02/09 BUG fixed in fission probability (missing parenthesis at denominator) |
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[819] | 103 | //AH fix from Vincente: G4double probability = (Exp1 + (1.0-Cf)*Exp2) / 4.0*pi*afission; |
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[962] | 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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[819] | 108 | |
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| 109 | return probability; |
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| 110 | } |
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| 111 | |
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