[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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| 27 | // $Id: G4FissionParameters.cc,v 1.5 2006/06/29 20:13:39 gunter Exp $ |
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[962] | 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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| 33 | |
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| 34 | |
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| 35 | #include "G4FissionParameters.hh" |
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| 36 | #include "G4HadronicException.hh" |
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| 37 | |
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| 38 | |
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| 39 | const G4double G4FissionParameters::A1 = 134.0; |
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| 40 | const G4double G4FissionParameters::A2 = 141.0; |
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| 41 | |
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| 42 | |
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| 43 | G4FissionParameters::G4FissionParameters(const G4int A, const G4int Z, const G4double ExEnergy, |
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| 44 | const G4double FissionBarrier) |
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| 45 | { |
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| 46 | G4double U = ExEnergy; |
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| 47 | |
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| 48 | As = A/2.0; |
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| 49 | |
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| 50 | if (A <= 235) Sigma2 = 5.6; // MeV |
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| 51 | else Sigma2 = 5.6 + 0.096*(A-235); // MeV |
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| 52 | |
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| 53 | Sigma1 = 0.5*Sigma2; // MeV |
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| 54 | |
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| 55 | SigmaS = std::exp(0.00553*U/MeV + 2.1386); // MeV |
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| 56 | if (SigmaS > 20.0) SigmaS = 20.0; |
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| 57 | |
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| 58 | G4double FasymAsym = 2.0*std::exp(-((A2-As)*(A2-As))/(2.0*Sigma2*Sigma2)) + |
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| 59 | std::exp(-((A1-As)*(A1-As))/(2.0*Sigma1*Sigma1)); |
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| 60 | |
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| 61 | G4double FsymA1A2 = std::exp(-((As-(A1+A2)/2.0)*(As-(A1+A2)/2.0))/(2.0*SigmaS*SigmaS)); |
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| 62 | |
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| 63 | |
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| 64 | G4double wa = 0.0; |
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| 65 | w = 0.0; |
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| 66 | if (Z >= 90) { // Z >= 90 |
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| 67 | if (U <= 16.25) wa = std::exp(0.5385*U/MeV-9.9564); // U <= 16.25 MeV |
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| 68 | else wa = std::exp(0.09197*U/MeV-2.7003); // U > 16.25 MeV |
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| 69 | } else if (Z == 89) { // Z == 89 |
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| 70 | wa = std::exp(0.09197*U-1.0808); |
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| 71 | } else if (Z >= 82) { // 82 <= Z <= 88 |
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| 72 | G4double X = FissionBarrier - 7.5*MeV; |
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| 73 | if (X < 0.0) X = 0.0; |
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| 74 | wa = std::exp(0.09197*(U-X)/MeV-1.0808); |
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| 75 | } else { // Z < 82 |
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| 76 | w = 1001.0; |
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| 77 | } |
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| 78 | |
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| 79 | if (w == 0.0) { |
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| 80 | G4double w1 = std::max(1.03*wa - FasymAsym, 0.0001); |
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| 81 | G4double w2 = std::max(1.0 - FsymA1A2*wa, 0.0001); |
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| 82 | |
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| 83 | w = w1/w2; |
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| 84 | |
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| 85 | if (82 <= Z && Z < 89 && A < 227) w *= std::exp(0.3*(227-A)); |
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| 86 | } |
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| 87 | |
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| 88 | } |
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| 89 | |
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| 90 | |
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| 91 | G4FissionParameters::G4FissionParameters(const G4FissionParameters &) |
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| 92 | { |
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| 93 | throw G4HadronicException(__FILE__, __LINE__, "G4FissionParameters::copy_constructor meant to not be accessable"); |
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| 94 | } |
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| 95 | |
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| 96 | |
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| 97 | const G4FissionParameters & G4FissionParameters::operator=(const G4FissionParameters &) |
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| 98 | { |
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| 99 | throw G4HadronicException(__FILE__, __LINE__, "G4FissionParameters::operator= meant to not be accessable"); |
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| 100 | return *this; |
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| 101 | } |
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| 102 | |
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| 103 | |
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| 104 | G4bool G4FissionParameters::operator==(const G4FissionParameters &) const |
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| 105 | { |
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| 106 | return false; |
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| 107 | } |
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| 108 | |
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| 109 | G4bool G4FissionParameters::operator!=(const G4FissionParameters &) const |
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| 110 | { |
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| 111 | return true; |
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| 112 | } |
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| 113 | |
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| 114 | |
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