[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 | #include "G4GNASHTransitions.hh" |
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| 27 | #include "G4PreCompoundParameters.hh" |
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| 28 | #include "G4HadronicException.hh" |
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| 29 | |
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| 30 | const G4GNASHTransitions & G4GNASHTransitions:: |
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| 31 | operator=(const G4GNASHTransitions & ) |
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| 32 | { |
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| 33 | throw G4HadronicException(__FILE__, __LINE__, "G4GNASHTransitions::operator= meant to not be accesable"); |
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| 34 | return *this; |
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| 35 | } |
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| 36 | |
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| 37 | G4bool G4GNASHTransitions::operator==(const G4GNASHTransitions & ) const |
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| 38 | { |
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| 39 | return false; |
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| 40 | } |
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| 41 | |
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| 42 | G4bool G4GNASHTransitions::operator!=(const G4GNASHTransitions & ) const |
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| 43 | { |
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| 44 | return true; |
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| 45 | } |
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| 46 | |
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| 47 | |
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| 48 | G4double G4GNASHTransitions:: |
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| 49 | CalculateProbability(const G4Fragment & aFragment) |
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| 50 | { |
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| 51 | const G4double k = 135.0 * MeV*MeV*MeV; |
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| 52 | G4double E = aFragment.GetExcitationEnergy(); |
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| 53 | G4double P = aFragment.GetNumberOfParticles(); |
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| 54 | G4double H = aFragment.GetNumberOfHoles(); |
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| 55 | G4double N = P + H; |
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| 56 | G4double A = aFragment.GetA(); |
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| 57 | |
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| 58 | G4double theMatrixElement(k*N/(A*A*A*E)); |
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| 59 | G4double x = E/N; |
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| 60 | if ( x < 2.0*MeV ) theMatrixElement *= x/std::sqrt(14.0*MeV*MeV); |
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| 61 | else if ( x < 7.0*MeV ) x *= std::sqrt(x/7.0*MeV); |
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| 62 | else if ( x < 15.0*MeV ) ; |
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| 63 | else x *= std::sqrt(15.0*MeV/x); |
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| 64 | |
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| 65 | // g = (6.0/pi2)*a*A |
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| 66 | G4double g = (6.0/pi2)*G4PreCompoundParameters::GetAddress()->GetLevelDensity()*A; |
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| 67 | |
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| 68 | G4double Epauli = ((P+1.0)*(P+1.0) + (H+1.0)*(H+1.0) + (P+1.0) - 3.0*(H-1.0))/4.0; |
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| 69 | |
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| 70 | G4double Probability = g*g*g *(E-Epauli)*(E-Epauli); |
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| 71 | Probability /= 2.0*(N+1.0)*h_Planck; |
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| 72 | Probability *= theMatrixElement; |
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| 73 | |
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| 74 | |
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| 75 | return Probability; |
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| 76 | } |
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| 77 | |
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| 78 | G4Fragment G4GNASHTransitions:: |
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| 79 | PerformTransition(const G4Fragment & aFragment) |
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| 80 | { |
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| 81 | G4Fragment result(aFragment); |
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| 82 | result.SetNumberOfParticles(result.GetNumberOfParticles()+1); |
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| 83 | result.SetNumberOfHoles(result.GetNumberOfHoles()+1); |
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| 84 | if (G4UniformRand() <= result.GetZ()/result.GetA()) |
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| 85 | { |
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| 86 | result.SetNumberOfCharged(result.GetNumberOfCharged()+1); |
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| 87 | } |
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| 88 | |
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| 89 | if (result.GetNumberOfParticles() < result.GetNumberOfCharged()) |
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| 90 | { |
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| 91 | result.SetNumberOfCharged(result.GetNumberOfParticles()); |
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| 92 | } |
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| 93 | |
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| 94 | return result; |
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| 95 | } |
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