1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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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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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: G4VPreCompoundFragment.cc,v 1.13 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 | // J. M. Quesada (August 2008). Based on previous work by V. Lara |
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30 | // |
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31 | // Modified: |
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32 | // 20.08.2010 V.Ivanchenko added G4Pow and G4PreCompoundParameters pointers |
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33 | // use int Z and A and cleanup |
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34 | |
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35 | #include "G4VPreCompoundFragment.hh" |
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36 | #include "G4PreCompoundParameters.hh" |
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37 | #include "G4NucleiProperties.hh" |
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38 | |
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39 | G4VPreCompoundFragment::G4VPreCompoundFragment( |
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40 | const G4ParticleDefinition* part, G4VCoulombBarrier* aCoulombBarrier) |
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41 | : particle(part), theCoulombBarrierPtr(aCoulombBarrier), |
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42 | theRestNucleusA(0),theRestNucleusZ(0),theBindingEnergy(0.0), |
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43 | theMaximalKineticEnergy(-MeV),theRestNucleusMass(0.0), |
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44 | theReducedMass(0.0),theMomentum(0.,0.,0.,0.), |
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45 | theEmissionProbability(0.0),theCoulombBarrier(0.0) |
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46 | { |
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47 | theA = particle->GetBaryonNumber(); |
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48 | theZ = G4int(particle->GetPDGCharge()/eplus + 0.1); |
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49 | theMass = particle->GetPDGMass(); |
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50 | theParameters = G4PreCompoundParameters::GetAddress(); |
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51 | g4pow = G4Pow::GetInstance(); |
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52 | } |
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53 | |
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54 | G4VPreCompoundFragment::~G4VPreCompoundFragment() |
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55 | {} |
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56 | |
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57 | std::ostream& |
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58 | operator << (std::ostream &out, const G4VPreCompoundFragment &theFragment) |
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59 | { |
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60 | out << &theFragment; |
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61 | return out; |
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62 | } |
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63 | |
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64 | std::ostream& |
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65 | operator << (std::ostream &out, const G4VPreCompoundFragment *theFragment) |
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66 | { |
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67 | std::ios::fmtflags old_floatfield = out.flags(); |
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68 | out.setf(std::ios::floatfield); |
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69 | |
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70 | out |
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71 | << "PreCompoundModel Emitted Fragment: A = " |
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72 | << std::setprecision(3) << theFragment->theA |
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73 | << ", Z = " << std::setprecision(3) << theFragment->theZ; |
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74 | out.setf(std::ios::scientific,std::ios::floatfield); |
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75 | // out |
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76 | // << ", U = " << theFragment->theExcitationEnergy/MeV |
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77 | // << " MeV" << endl |
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78 | // << " P = (" |
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79 | // << theFragment->theMomentum.x()/MeV << "," |
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80 | // << theFragment->theMomentum.y()/MeV << "," |
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81 | // << theFragment->theMomentum.z()/MeV |
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82 | // << ") MeV E = " |
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83 | // << theFragment->theMomentum.t()/MeV << " MeV"; |
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84 | |
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85 | out.setf(old_floatfield,std::ios::floatfield); |
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86 | return out; |
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87 | } |
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88 | |
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89 | void G4VPreCompoundFragment:: |
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90 | Initialize(const G4Fragment & aFragment) |
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91 | { |
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92 | theRestNucleusA = aFragment.GetA_asInt() - theA; |
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93 | theRestNucleusZ = aFragment.GetZ_asInt() - theZ; |
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94 | theRestNucleusA13 = g4pow->Z13(theRestNucleusA); |
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95 | |
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96 | if ((theRestNucleusA < theRestNucleusZ) || |
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97 | (theRestNucleusA < theA) || |
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98 | (theRestNucleusZ < theZ)) |
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99 | { |
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100 | // In order to be sure that emission probability will be 0. |
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101 | theMaximalKineticEnergy = 0.0; |
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102 | return; |
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103 | } |
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104 | |
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105 | // Calculate Coulomb barrier |
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106 | theCoulombBarrier = theCoulombBarrierPtr-> |
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107 | GetCoulombBarrier(theRestNucleusA,theRestNucleusZ, |
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108 | aFragment.GetExcitationEnergy()); |
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109 | |
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110 | // Calculate masses |
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111 | theRestNucleusMass = |
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112 | G4NucleiProperties::GetNuclearMass(theRestNucleusA, theRestNucleusZ); |
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113 | theReducedMass = theRestNucleusMass*theMass/(theRestNucleusMass + theMass); |
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114 | |
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115 | // Compute Binding Energies for fragments |
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116 | // (needed to separate a fragment from the nucleus) |
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117 | theBindingEnergy = theRestNucleusMass + theMass - aFragment.GetGroundStateMass(); |
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118 | |
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119 | //theBindingEnergy = G4NucleiProperties::GetMassExcess(static_cast<G4int>(theA),static_cast<G4int>(theZ)) + |
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120 | //G4NucleiProperties::GetMassExcess(static_cast<G4int>(theRestNucleusA),static_cast<G4int>(theRestNucleusZ)) - |
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121 | //G4NucleiProperties::GetMassExcess(static_cast<G4int>(aFragment.GetA()),static_cast<G4int>(aFragment.GetZ())); |
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122 | |
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123 | // Compute Maximal Kinetic Energy which can be carried by fragments after separation |
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124 | // This is the true (assimptotic) maximal kinetic energy |
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125 | G4double m = aFragment.GetMomentum().m(); |
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126 | G4double rm = theRestNucleusMass; |
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127 | G4double em = theMass; |
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128 | theMaximalKineticEnergy = ((m - rm)*(m + rm) + em*em)/(2.0*m) - em; |
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129 | |
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130 | return; |
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131 | } |
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