[819] | 1 | // |
---|
| 2 | // ******************************************************************** |
---|
| 3 | // * License and Disclaimer * |
---|
| 4 | // * * |
---|
| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
| 7 | // * conditions of the Geant4 Software License, included in the file * |
---|
| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
| 9 | // * include a list of copyright holders. * |
---|
| 10 | // * * |
---|
| 11 | // * Neither the authors of this software system, nor their employing * |
---|
| 12 | // * institutes,nor the agencies providing financial support for this * |
---|
| 13 | // * work make any representation or warranty, express or implied, * |
---|
| 14 | // * regarding this software system or assume any liability for its * |
---|
| 15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
| 16 | // * for the full disclaimer and the limitation of liability. * |
---|
| 17 | // * * |
---|
| 18 | // * This code implementation is the result of the scientific and * |
---|
| 19 | // * technical work of the GEANT4 collaboration. * |
---|
| 20 | // * By using, copying, modifying or distributing the software (or * |
---|
| 21 | // * any work based on the software) you agree to acknowledge its * |
---|
| 22 | // * use in resulting scientific publications, and indicate your * |
---|
| 23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
| 24 | // ******************************************************************** |
---|
| 25 | // |
---|
| 26 | // |
---|
[1347] | 27 | // $Id: G4FissionParameters.cc,v 1.8 2010/11/17 20:22:46 vnivanch Exp $ |
---|
| 28 | // GEANT4 tag $Name: geant4-09-04-ref-00 $ |
---|
[819] | 29 | // |
---|
| 30 | // Hadronic Process: Nuclear De-excitations |
---|
| 31 | // by V. Lara (Oct 1998) |
---|
| 32 | // |
---|
[1196] | 33 | //J. M. Quesada (May 2009): sigma_sym (SigmaS) tuned for spallation data. |
---|
| 34 | //J. M. Quesada (30.10.09): retuning for IAEA spallation data |
---|
[819] | 35 | |
---|
| 36 | #include "G4FissionParameters.hh" |
---|
| 37 | #include "G4HadronicException.hh" |
---|
| 38 | |
---|
| 39 | |
---|
| 40 | const G4double G4FissionParameters::A1 = 134.0; |
---|
| 41 | const G4double G4FissionParameters::A2 = 141.0; |
---|
| 42 | |
---|
[1347] | 43 | G4FissionParameters::G4FissionParameters(G4int A, G4int Z, G4double ExEnergy, |
---|
| 44 | G4double FissionBarrier) |
---|
[819] | 45 | { |
---|
[1347] | 46 | G4double U = ExEnergy; |
---|
| 47 | |
---|
| 48 | As = A/2.0; |
---|
[1196] | 49 | |
---|
[1347] | 50 | if (A <= 235) Sigma2 = 5.6; // MeV |
---|
| 51 | else Sigma2 = 5.6 + 0.096*(A-235); // MeV |
---|
[1196] | 52 | |
---|
[1347] | 53 | Sigma1 = 0.5*Sigma2; // MeV |
---|
[1196] | 54 | |
---|
[1347] | 55 | SigmaS = std::exp(0.00553*U/MeV + 2.1386); // MeV |
---|
[1196] | 56 | |
---|
[1347] | 57 | //JMQ 310509 |
---|
| 58 | // if (SigmaS > 20.0) SigmaS = 20.0; |
---|
| 59 | // SigmaS*=1.3; |
---|
| 60 | //JMQ 301009: retuning (after CEM transition prob.have been chosen as default) |
---|
| 61 | SigmaS*=0.8; |
---|
| 62 | // |
---|
[1196] | 63 | |
---|
[1347] | 64 | G4double FasymAsym = 2.0*std::exp(-((A2-As)*(A2-As))/(2.0*Sigma2*Sigma2)) + |
---|
| 65 | std::exp(-((A1-As)*(A1-As))/(2.0*Sigma1*Sigma1)); |
---|
[1196] | 66 | |
---|
[1347] | 67 | G4double FsymA1A2 = std::exp(-((As-(A1+A2)/2.0)*(As-(A1+A2)/2.0)) |
---|
| 68 | /(2.0*SigmaS*SigmaS)); |
---|
[1196] | 69 | |
---|
| 70 | |
---|
[1347] | 71 | G4double wa = 0.0; |
---|
| 72 | w = 0.0; |
---|
| 73 | if (Z >= 90) { // Z >= 90 |
---|
| 74 | if (U <= 16.25) wa = std::exp(0.5385*U/MeV-9.9564); // U <= 16.25 MeV |
---|
| 75 | else wa = std::exp(0.09197*U/MeV-2.7003); // U > 16.25 MeV |
---|
| 76 | } else if (Z == 89) { // Z == 89 |
---|
| 77 | wa = std::exp(0.09197*U-1.0808); |
---|
| 78 | } else if (Z >= 82) { // 82 <= Z <= 88 |
---|
| 79 | G4double X = FissionBarrier - 7.5*MeV; |
---|
| 80 | if (X < 0.0) X = 0.0; |
---|
| 81 | wa = std::exp(0.09197*(U-X)/MeV-1.0808); |
---|
| 82 | } else { // Z < 82 |
---|
| 83 | w = 1001.0; |
---|
| 84 | } |
---|
[1196] | 85 | |
---|
[1347] | 86 | if (w == 0.0) { |
---|
| 87 | G4double w1 = std::max(1.03*wa - FasymAsym, 0.0001); |
---|
| 88 | G4double w2 = std::max(1.0 - FsymA1A2*wa, 0.0001); |
---|
[1196] | 89 | |
---|
[1347] | 90 | w = w1/w2; |
---|
[1196] | 91 | |
---|
[1347] | 92 | if (82 <= Z && Z < 89 && A < 227) w *= std::exp(0.3*(227-A)); |
---|
| 93 | } |
---|
[819] | 94 | |
---|
| 95 | } |
---|
| 96 | |
---|
[1347] | 97 | G4FissionParameters::~G4FissionParameters() |
---|
| 98 | {} |
---|
[819] | 99 | |
---|