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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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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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13 | // * work make any representation or warranty, express or implied, * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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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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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 | // $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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29 | // by V. Lara |
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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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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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39 | G4HETCFragment(const G4ParticleDefinition* part, |
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40 | G4VCoulombBarrier* aCoulombBarrier) |
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41 | : G4VPreCompoundFragment(part, aCoulombBarrier) |
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42 | { |
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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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45 | } |
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46 | |
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47 | G4HETCFragment::~G4HETCFragment() |
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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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54 | { |
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55 | theEmissionProbability = 0.0; |
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56 | return 0.0; |
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57 | } |
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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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64 | G4double UpperLimit = GetMaximalKineticEnergy(); |
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65 | |
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66 | theEmissionProbability = |
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67 | IntegrateEmissionProbability(LowerLimit,UpperLimit,aFragment); |
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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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77 | if ( !IsItPossible(aFragment) ) { return 0.0; } |
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78 | |
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79 | G4double U = aFragment.GetExcitationEnergy(); |
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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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92 | U = std::max(U-A,0.0); |
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93 | if (U <= 0.0) { return 0.0; } |
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94 | |
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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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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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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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111 | |
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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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118 | return Probability; |
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119 | } |
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