[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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[1340] | 26 | // $Id: G4HETCFragment.cc,v 1.4 2010/08/28 15:16:55 vnivanch Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-03-ref-09 $ |
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| 28 | // |
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[819] | 29 | // by V. Lara |
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[1340] | 30 | // |
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| 31 | // Modified: |
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| 32 | // 23.08.2010 V.Ivanchenko general cleanup, move constructor and destructor |
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| 33 | // the source, use G4Pow |
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[819] | 34 | |
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| 35 | #include "G4HETCFragment.hh" |
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| 36 | #include "G4PreCompoundParameters.hh" |
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| 37 | |
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| 38 | G4HETCFragment:: |
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[1340] | 39 | G4HETCFragment(const G4ParticleDefinition* part, |
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| 40 | G4VCoulombBarrier* aCoulombBarrier) |
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| 41 | : G4VPreCompoundFragment(part, aCoulombBarrier) |
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[819] | 42 | { |
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[1340] | 43 | G4double r0 = theParameters->Getr0(); |
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| 44 | r2norm = r0*r0/(CLHEP::pi*CLHEP::hbarc*CLHEP::hbarc*CLHEP::hbarc); |
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[819] | 45 | } |
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| 46 | |
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[1340] | 47 | G4HETCFragment::~G4HETCFragment() |
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[819] | 48 | {} |
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| 49 | |
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| 50 | G4double G4HETCFragment:: |
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| 51 | CalcEmissionProbability(const G4Fragment & aFragment) |
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| 52 | { |
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| 53 | if (GetEnergyThreshold() <= 0.0) |
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[1340] | 54 | { |
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[819] | 55 | theEmissionProbability = 0.0; |
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| 56 | return 0.0; |
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[1340] | 57 | } |
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[819] | 58 | // Coulomb barrier is the lower limit |
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| 59 | // of integration over kinetic energy |
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| 60 | G4double LowerLimit = theCoulombBarrier; |
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| 61 | |
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| 62 | // Excitation energy of nucleus after fragment emission is the upper limit |
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| 63 | // of integration over kinetic energy |
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[1340] | 64 | G4double UpperLimit = GetMaximalKineticEnergy(); |
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[819] | 65 | |
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[1340] | 66 | theEmissionProbability = |
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| 67 | IntegrateEmissionProbability(LowerLimit,UpperLimit,aFragment); |
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[819] | 68 | |
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| 69 | return theEmissionProbability; |
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| 70 | } |
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| 71 | |
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| 72 | G4double G4HETCFragment:: |
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| 73 | IntegrateEmissionProbability(const G4double & Low, const G4double & Up, |
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| 74 | const G4Fragment & aFragment) |
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| 75 | { |
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| 76 | |
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[1340] | 77 | if ( !IsItPossible(aFragment) ) { return 0.0; } |
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[819] | 78 | |
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| 79 | G4double U = aFragment.GetExcitationEnergy(); |
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[1340] | 80 | |
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| 81 | G4int P = aFragment.GetNumberOfParticles(); |
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| 82 | G4int H = aFragment.GetNumberOfHoles(); |
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| 83 | G4int N = P + H; |
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| 84 | G4int Pb = P - GetA(); |
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| 85 | G4int Nb = Pb + H; |
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| 86 | if (Nb <= 0.0) { return 0.0; } |
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| 87 | G4double g = (6.0/pi2)*aFragment.GetA()*theParameters->GetLevelDensity(); |
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| 88 | G4double gb = (6.0/pi2)*GetRestA()*theParameters->GetLevelDensity(); |
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| 89 | |
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| 90 | G4double A = G4double(P*P+H*H+P-3*H)/(4.0*g); |
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| 91 | G4double Ab = G4double(Pb*Pb+H*H+Pb-3*H)/(4.0*gb); |
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[819] | 92 | U = std::max(U-A,0.0); |
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[1340] | 93 | if (U <= 0.0) { return 0.0; } |
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[819] | 94 | |
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[1340] | 95 | G4int Pf = P; |
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| 96 | G4int Hf = H; |
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| 97 | G4int Nf = N-1; |
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| 98 | for (G4int i = 1; i < GetA(); ++i) |
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[819] | 99 | { |
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| 100 | Pf *= (P-i); |
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| 101 | Hf *= (H-i); |
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| 102 | Nf *= (N-1-i); |
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| 103 | } |
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| 104 | |
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| 105 | G4double X = std::max(Up - Ab + GetBeta(),0.0); |
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| 106 | G4double Y = std::max(Up - Ab - Low, 0.0); |
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| 107 | |
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[1340] | 108 | G4double Probability = r2norm*GetSpinFactor()*GetReducedMass()*GetAlpha() |
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| 109 | *g4pow->Z23(GetRestA())*Pf*Hf*Nf*K(aFragment)*(X/Nb - Y/(Nb+1)) |
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| 110 | *U*g4pow->powN(g*gb,Nb)/g4pow->powN(g*U,N); |
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[819] | 111 | |
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[1340] | 112 | // G4double Probability = GetSpinFactor()/(pi*hbarc*hbarc*hbarc) |
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| 113 | // * GetReducedMass() * GetAlpha() * |
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| 114 | // r0 * r0 * std::pow->Z23(GetRestA())/std::pow->pow(U,G4double(N-1)) * |
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| 115 | // (std::pow->(gb,Nb)/std::pow(g,N)) * Pf * Hf * Nf * K(aFragment) * |
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| 116 | // std::pow(Y,Nb) * (X/Nb - Y/(Nb+1)); |
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| 117 | |
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[819] | 118 | return Probability; |
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| 119 | } |
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