[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 | // by V. Lara |
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| 27 | |
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| 28 | #include "G4HETCFragment.hh" |
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| 29 | #include "G4PreCompoundParameters.hh" |
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| 30 | |
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| 31 | G4HETCFragment:: |
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| 32 | G4HETCFragment(const G4HETCFragment & right) : |
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| 33 | G4VPreCompoundFragment(right) |
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| 34 | { |
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| 35 | } |
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| 36 | |
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| 37 | G4HETCFragment:: |
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| 38 | G4HETCFragment(const G4double anA, |
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| 39 | const G4double aZ, |
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| 40 | G4VCoulombBarrier* aCoulombBarrier, |
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| 41 | const G4String & aName) : |
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| 42 | G4VPreCompoundFragment(anA,aZ,aCoulombBarrier,aName) |
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| 43 | {} |
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| 44 | |
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| 45 | G4HETCFragment::~G4HETCFragment() |
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| 46 | { |
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| 47 | } |
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| 48 | |
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| 49 | const G4HETCFragment & G4HETCFragment:: |
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| 50 | operator= (const G4HETCFragment & right) |
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| 51 | { |
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| 52 | if (&right != this) this->G4VPreCompoundFragment::operator=(right); |
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| 53 | return *this; |
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| 54 | } |
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| 55 | |
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| 56 | G4int G4HETCFragment::operator==(const G4HETCFragment & right) const |
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| 57 | { |
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| 58 | return G4VPreCompoundFragment::operator==(right); |
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| 59 | } |
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| 60 | |
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| 61 | G4int G4HETCFragment::operator!=(const G4HETCFragment & right) const |
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| 62 | { |
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| 63 | return G4VPreCompoundFragment::operator!=(right); |
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| 64 | } |
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| 65 | |
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| 66 | |
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| 67 | |
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| 68 | G4double G4HETCFragment:: |
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| 69 | CalcEmissionProbability(const G4Fragment & aFragment) |
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| 70 | { |
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| 71 | if (GetEnergyThreshold() <= 0.0) |
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| 72 | { |
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| 73 | theEmissionProbability = 0.0; |
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| 74 | return 0.0; |
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| 75 | } |
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| 76 | // Coulomb barrier is the lower limit |
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| 77 | // of integration over kinetic energy |
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| 78 | G4double LowerLimit = theCoulombBarrier; |
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| 79 | |
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| 80 | // Excitation energy of nucleus after fragment emission is the upper limit |
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| 81 | // of integration over kinetic energy |
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| 82 | G4double UpperLimit = this->GetMaximalKineticEnergy(); |
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| 83 | |
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| 84 | theEmissionProbability = IntegrateEmissionProbability(LowerLimit,UpperLimit,aFragment); |
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| 85 | |
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| 86 | return theEmissionProbability; |
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| 87 | } |
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| 88 | |
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| 89 | G4double G4HETCFragment:: |
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| 90 | IntegrateEmissionProbability(const G4double & Low, const G4double & Up, |
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| 91 | const G4Fragment & aFragment) |
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| 92 | { |
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| 93 | |
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| 94 | if ( !IsItPossible(aFragment) ) return 0.0; |
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| 95 | |
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| 96 | const G4double r0 = G4PreCompoundParameters::GetAddress()->Getr0(); |
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| 97 | |
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| 98 | G4double U = aFragment.GetExcitationEnergy(); |
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| 99 | G4double P = aFragment.GetNumberOfParticles(); |
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| 100 | G4double H = aFragment.GetNumberOfHoles(); |
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| 101 | G4double N = P + H; |
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| 102 | G4double Pb = P - GetA(); |
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| 103 | G4double Nb = Pb + H; |
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| 104 | if (Nb <= 0.0) return 0.0; |
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| 105 | |
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| 106 | G4double A = (P*P+H*H+P-3*H)/4.0; |
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| 107 | G4double Ab = (Pb*Pb+H*H+Pb-3*H)/4.0; |
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| 108 | U = std::max(U-A,0.0); |
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| 109 | if (U <= 0.0) return 0.0; |
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| 110 | |
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| 111 | G4double g = (6.0/pi2)*aFragment.GetA()*G4PreCompoundParameters::GetAddress()->GetLevelDensity(); |
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| 112 | G4double gb = (6.0/pi2)*GetRestA()*G4PreCompoundParameters::GetAddress()->GetLevelDensity(); |
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| 113 | |
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| 114 | G4double Pf = P; |
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| 115 | G4double Hf = H; |
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| 116 | G4double Nf = N-1.0; |
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| 117 | for (G4int i = 1; i < GetA(); i++) |
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| 118 | { |
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| 119 | Pf *= (P-i); |
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| 120 | Hf *= (H-i); |
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| 121 | Nf *= (N-1-i); |
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| 122 | } |
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| 123 | |
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| 124 | G4double X = std::max(Up - Ab + GetBeta(),0.0); |
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| 125 | G4double Y = std::max(Up - Ab - Low, 0.0); |
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| 126 | |
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| 127 | G4double Probability = GetSpinFactor()/(pi*hbarc*hbarc*hbarc) * GetReducedMass() * GetAlpha() * |
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| 128 | r0 * r0 * std::pow(GetRestA(),2.0/3.0)/std::pow(U,N-1) * (std::pow(gb,Nb)/std::pow(g,N)) * Pf * Hf * Nf * K(aFragment) * |
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| 129 | std::pow(Y,Nb) * (X/Nb - Y/(Nb+1)); |
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| 130 | |
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| 131 | return Probability; |
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| 132 | } |
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