[819] | 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 | // |
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[1347] | 27 | // $Id: G4FissionProbability.cc,v 1.10 2010/11/17 20:22:46 vnivanch Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-04-ref-00 $ |
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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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[1055] | 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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[1347] | 40 | G4FissionProbability::G4FissionProbability() |
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| 41 | {} |
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[819] | 42 | |
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[1347] | 43 | G4FissionProbability::~G4FissionProbability() |
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| 44 | {} |
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[819] | 45 | |
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| 46 | |
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[1347] | 47 | G4double |
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| 48 | G4FissionProbability::EmissionProbability(const G4Fragment & fragment, |
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| 49 | G4double MaximalKineticEnergy) |
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| 50 | // Compute integrated probability of fission channel |
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[819] | 51 | { |
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[1347] | 52 | if (MaximalKineticEnergy <= 0.0) return 0.0; |
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| 53 | G4int A = fragment.GetA_asInt(); |
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| 54 | G4int Z = fragment.GetZ_asInt(); |
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| 55 | G4double U = fragment.GetExcitationEnergy(); |
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| 56 | |
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| 57 | G4double Ucompound = U - |
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| 58 | G4PairingCorrection::GetInstance()->GetPairingCorrection(A,Z); |
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[819] | 59 | |
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[1347] | 60 | G4double Ufission = U - |
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| 61 | G4PairingCorrection::GetInstance()->GetFissionPairingCorrection(A,Z); |
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[819] | 62 | |
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[1347] | 63 | G4double SystemEntropy = |
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| 64 | 2.0*std::sqrt(theEvapLDP.LevelDensityParameter(A,Z,Ucompound)*Ucompound); |
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[819] | 65 | |
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[1347] | 66 | G4double afission = theFissLDP.LevelDensityParameter(A,Z,Ufission); |
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[819] | 67 | |
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[1347] | 68 | G4double Cf = 2.0*std::sqrt(afission*MaximalKineticEnergy); |
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[819] | 69 | |
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[1347] | 70 | // G4double Q1 = 1.0 + (Cf - 1.0)*std::exp(Cf); |
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| 71 | // G4double Q2 = 4.0*pi*afission*std::exp(SystemEntropy); |
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| 72 | |
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| 73 | // G4double probability = Q1/Q2; |
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| 74 | |
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| 75 | G4double Exp1 = 0.0; |
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| 76 | if (SystemEntropy <= 160.0) { Exp1 = std::exp(-SystemEntropy); } |
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| 77 | // @@@@@@@@@@@@@@@@@ hpw changed max to min - cannot notify vicente now |
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| 78 | G4double Exp2 = std::exp( std::min(700.0,Cf-SystemEntropy) ); |
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[819] | 79 | |
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[1347] | 80 | // JMQ 14/02/09 BUG fixed in fission probability (missing parenthesis |
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| 81 | // at denominator) |
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| 82 | //AH fix from Vincente: G4double probability = |
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| 83 | // (Exp1 + (1.0-Cf)*Exp2) / 4.0*pi*afission; |
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| 84 | // G4double probability = (Exp1 + (Cf-1.0)*Exp2) / 4.0*pi*afission; |
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| 85 | G4double probability = (Exp1 + (Cf-1.0)*Exp2) / (4.0*pi*afission); |
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[1055] | 86 | |
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[1347] | 87 | return probability; |
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[819] | 88 | } |
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| 89 | |
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