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24 | // ******************************************************************** |
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25 | // $Id: G4CascadeRecoilMaker.cc,v 1.7 2010/09/25 06:44:30 mkelsey Exp $ |
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26 | // Geant4 tag: $Name: hadr-casc-V09-03-85 $ |
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27 | // |
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28 | // Collects generated cascade data (using Collider::collide() interface) |
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29 | // and computes the nuclear recoil kinematics needed to balance the event. |
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30 | // |
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31 | // 20100909 M. Kelsey -- Inspired by G4CascadeCheckBalance |
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32 | // 20100909 M. Kelsey -- Move G4IntraNucleiCascader::goodCase() here, add |
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33 | // tolerance for "almost zero" excitation energy |
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34 | // 20100910 M. Kelsey -- Drop getRecoilFragment() in favor of user calling |
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35 | // makeRecoilFragment() with returned non-const pointer. Drop |
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36 | // handling of excitons. |
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37 | // 20100921 M. Kelsey -- Return G4InuclNuclei using "makeRecoilNuclei()". |
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38 | // Repurpose "makeRecoilFragment()" to return G4Fragment. |
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39 | // 20100924 M. Kelsey -- Remove unusable G4Fragment::SetExcitationEnergy(). |
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40 | // Add deltaM to compute mass difference, use excitationEnergy |
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41 | // to force G4Fragment four-vector to match. |
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42 | |
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43 | #include "G4CascadeRecoilMaker.hh" |
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44 | #include "globals.hh" |
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45 | #include "G4CascadParticle.hh" |
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46 | #include "G4CascadeCheckBalance.hh" |
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47 | #include "G4CollisionOutput.hh" |
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48 | #include "G4Fragment.hh" |
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49 | #include "G4InuclElementaryParticle.hh" |
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50 | #include "G4InuclNuclei.hh" |
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51 | #include "G4InuclParticle.hh" |
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52 | #include "G4InuclSpecialFunctions.hh" |
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53 | #include "G4LorentzVector.hh" |
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54 | #include <vector> |
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55 | |
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56 | using namespace G4InuclSpecialFunctions; |
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57 | |
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58 | |
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59 | // Constructor and destructor |
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60 | |
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61 | G4CascadeRecoilMaker::G4CascadeRecoilMaker(G4double tolerance) |
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62 | : G4VCascadeCollider("G4CascadeRecoilMaker"), |
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63 | excTolerance(tolerance), inputEkin(0.), |
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64 | recoilA(0), recoilZ(0), excitationEnergy(0.) { |
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65 | balance = new G4CascadeCheckBalance(tolerance, tolerance, theName); |
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66 | } |
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67 | |
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68 | G4CascadeRecoilMaker::~G4CascadeRecoilMaker() { |
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69 | delete balance; |
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70 | } |
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71 | |
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72 | |
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73 | // Standard Collider interface (non-const output "buffer") |
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74 | |
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75 | void G4CascadeRecoilMaker::collide(G4InuclParticle* bullet, |
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76 | G4InuclParticle* target, |
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77 | G4CollisionOutput& output) { |
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78 | if (verboseLevel > 1) |
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79 | G4cout << " >>> G4CascadeRecoilMaker::collide" << G4endl; |
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80 | |
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81 | // Available energy needed for "goodNucleus()" test at end |
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82 | inputEkin = bullet ? bullet->getKineticEnergy() : 0.; |
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83 | |
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84 | balance->setVerboseLevel(verboseLevel); |
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85 | balance->collide(bullet, target, output); |
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86 | fillRecoil(); |
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87 | } |
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88 | |
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89 | // This is for use with G4IntraNucleiCascader |
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90 | |
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91 | void G4CascadeRecoilMaker::collide(G4InuclParticle* bullet, |
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92 | G4InuclParticle* target, |
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93 | const std::vector<G4InuclElementaryParticle>& particles, |
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94 | const std::vector<G4CascadParticle>& cparticles) { |
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95 | if (verboseLevel > 1) |
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96 | G4cout << " >>> G4CascadeRecoilMaker::collide(<EP>,<CP>)" << G4endl; |
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97 | |
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98 | // Available energy needed for "goodNucleus()" test at end |
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99 | inputEkin = bullet ? bullet->getKineticEnergy() : 0.; |
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100 | |
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101 | balance->setVerboseLevel(verboseLevel); |
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102 | balance->collide(bullet, target, particles, cparticles); |
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103 | fillRecoil(); |
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104 | } |
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105 | |
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106 | |
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107 | // Used current event configuration to construct recoil nucleus |
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108 | // NOTE: CheckBalance uses "final-initial", we want "initial-final" |
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109 | |
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110 | void G4CascadeRecoilMaker::fillRecoil() { |
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111 | recoilZ = -(balance->deltaQ()); // Charge "non-conservation" |
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112 | recoilA = -(balance->deltaB()); // Baryon "non-conservation" |
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113 | recoilMomentum = -(balance->deltaLV()); |
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114 | |
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115 | theExcitons.clear(); // Discard previous exciton configuraiton |
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116 | |
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117 | // Bertini uses MeV for excitation energy |
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118 | if (!goodFragment()) excitationEnergy = 0.; |
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119 | else excitationEnergy = deltaM() * GeV; |
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120 | |
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121 | // Allow for very small negative mass difference, and round to zero |
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122 | if (std::abs(excitationEnergy) < excTolerance) excitationEnergy = 0.; |
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123 | |
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124 | if (verboseLevel > 2) { |
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125 | G4cout << " recoil px " << recoilMomentum.px() |
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126 | << " py " << recoilMomentum.py() << " pz " << recoilMomentum.pz() |
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127 | << " E " << recoilMomentum.e() << " baryon " << recoilA |
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128 | << " charge " << recoilZ |
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129 | << "\n recoil mass " << recoilMomentum.m() |
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130 | << " 'excitation' energy " << excitationEnergy << G4endl; |
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131 | } |
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132 | } |
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133 | |
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134 | |
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135 | // Construct physical nucleus from recoil parameters, if reasonable |
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136 | |
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137 | G4InuclNuclei* G4CascadeRecoilMaker::makeRecoilNuclei(G4int model) { |
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138 | if (verboseLevel > 1) |
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139 | G4cout << " >>> G4CascadeRecoilMaker::makeRecoilNuclei" << G4endl; |
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140 | |
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141 | if (!goodRecoil()) { |
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142 | if (verboseLevel > 2 && !wholeEvent()) |
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143 | G4cout << theName << ": event recoil is not a physical nucleus" << G4endl; |
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144 | |
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145 | return 0; // Null pointer means no fragment |
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146 | } |
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147 | |
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148 | theRecoilNuclei.fill(recoilMomentum, recoilA, recoilZ, |
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149 | excitationEnergy, model); |
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150 | theRecoilNuclei.setExitonConfiguration(theExcitons); |
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151 | |
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152 | return &theRecoilNuclei; |
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153 | } |
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154 | |
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155 | |
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156 | // Construct pre-compound nuclear fragment from recoil parameters |
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157 | |
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158 | G4Fragment* G4CascadeRecoilMaker::makeRecoilFragment() { |
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159 | if (verboseLevel > 1) |
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160 | G4cout << " >>> G4CascadeRecoilMaker::makeRecoilFragment" << G4endl; |
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161 | |
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162 | if (!goodRecoil()) { |
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163 | if (verboseLevel > 2 && !wholeEvent()) |
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164 | G4cout << theName << ": event recoil is not a physical nucleus" << G4endl; |
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165 | |
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166 | return 0; // Null pointer means no fragment |
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167 | } |
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168 | |
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169 | theRecoilFragment.SetZandA_asInt(recoilZ, recoilA); // Note convention! |
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170 | |
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171 | // User may have overridden excitation energy; force four-momentum to match |
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172 | G4double fragMass = |
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173 | G4InuclNuclei::getNucleiMass(recoilA,recoilZ) + excitationEnergy/GeV; |
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174 | |
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175 | G4LorentzVector fragMom; fragMom.setVectM(recoilMomentum.vect(), fragMass); |
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176 | theRecoilFragment.SetMomentum(fragMom*GeV); // Bertini uses GeV! |
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177 | |
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178 | // Note: exciton configuration has to be set piece by piece |
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179 | theRecoilFragment.SetNumberOfHoles(theExcitons.protonHoles |
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180 | + theExcitons.neutronHoles); |
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181 | |
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182 | theRecoilFragment.SetNumberOfParticles(theExcitons.protonQuasiParticles |
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183 | + theExcitons.neutronQuasiParticles); |
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184 | |
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185 | theRecoilFragment.SetNumberOfCharged(theExcitons.protonQuasiParticles); |
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186 | |
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187 | return &theRecoilFragment; |
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188 | } |
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189 | |
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190 | |
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191 | // Compute raw mass difference from recoil parameters |
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192 | |
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193 | G4double G4CascadeRecoilMaker::deltaM() const { |
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194 | G4double nucMass = G4InuclNuclei::getNucleiMass(recoilA,recoilZ); |
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195 | return (recoilMomentum.m() - nucMass); |
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196 | } |
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197 | |
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198 | |
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199 | // Data quality checks |
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200 | |
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201 | G4bool G4CascadeRecoilMaker::goodFragment() const { |
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202 | return (recoilA>0 && recoilZ>=0 && recoilA >= recoilZ); |
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203 | } |
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204 | |
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205 | G4bool G4CascadeRecoilMaker::goodRecoil() const { |
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206 | return (goodFragment() && excitationEnergy > -excTolerance); |
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207 | } |
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208 | |
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209 | G4bool G4CascadeRecoilMaker::wholeEvent() const { |
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210 | return (recoilA==0 && recoilZ==0 && |
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211 | recoilMomentum.rho() < excTolerance/GeV && |
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212 | std::abs(recoilMomentum.e()) < excTolerance/GeV); |
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213 | } |
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214 | |
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215 | // Determine whether desired nuclear fragment is constructable outcome |
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216 | |
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217 | G4bool G4CascadeRecoilMaker::goodNucleus() const { |
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218 | if (verboseLevel > 2) { |
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219 | G4cout << " >>> G4CascadeRecoilMaker::goodNucleus" << G4endl; |
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220 | } |
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221 | |
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222 | const G4double minExcitation = 0.1*keV; |
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223 | const G4double reasonableExcitation = 7.0; // Multiple of binding energy |
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224 | const G4double fractionalExcitation = 0.2; // Fraction of input to excite |
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225 | |
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226 | if (!goodRecoil()) return false; // Not a sensible nucleus |
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227 | |
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228 | if (excitationEnergy < -excTolerance) return false; // Negative mass-diff |
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229 | |
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230 | if (excitationEnergy <= minExcitation) return true; // Effectively zero |
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231 | |
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232 | // Maximum possible excitation energy determined by initial energy |
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233 | G4double dm = bindingEnergy(recoilA,recoilZ); |
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234 | G4double exc_max0z = fractionalExcitation * inputEkin*GeV; |
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235 | G4double exc_dm = reasonableExcitation * dm; |
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236 | G4double exc_max = (exc_max0z > exc_dm) ? exc_max0z : exc_dm; |
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237 | |
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238 | if (verboseLevel > 3) { |
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239 | G4cout << " eexs " << excitationEnergy << " max " << exc_max |
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240 | << " dm " << dm << G4endl; |
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241 | } |
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242 | |
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243 | return (excitationEnergy < exc_max); // Below maximum possible |
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244 | } |
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