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24 | // ******************************************************************** |
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25 | // $Id: G4NonEquilibriumEvaporator.cc,v 1.40 2010/09/24 20:51:05 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 | // 20100114 M. Kelsey -- Remove G4CascadeMomentum, use G4LorentzVector directly |
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29 | // 20100309 M. Kelsey -- Use new generateWithRandomAngles for theta,phi stuff; |
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30 | // eliminate some unnecessary std::pow() |
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31 | // 20100412 M. Kelsey -- Pass G4CollisionOutput by ref to ::collide() |
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32 | // 20100413 M. Kelsey -- Pass buffers to paraMaker[Truncated] |
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33 | // 20100517 M. Kelsey -- Inherit from common base class |
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34 | // 20100617 M. Kelsey -- Remove "RUN" preprocessor flag and all "#else" code |
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35 | // 20100622 M. Kelsey -- Use local "bindingEnergy()" function to call through. |
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36 | // 20100701 M. Kelsey -- Don't need to add excitation to nuclear mass; compute |
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37 | // new excitation energies properly (mass differences) |
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38 | // 20100713 M. Kelsey -- Add conservation checking, diagnostic messages. |
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39 | // 20100714 M. Kelsey -- Move conservation checking to base class |
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40 | // 20100719 M. Kelsey -- Simplify EEXS calculations with particle evaporation. |
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41 | // 20100724 M. Kelsey -- Replace std::vector<> D with trivial D[3] array. |
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42 | // 20100914 M. Kelsey -- Migrate to integer A and Z: this involves replacing |
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43 | // a number of G4double terms with G4int, with consequent casts. |
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44 | |
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45 | #include "G4NonEquilibriumEvaporator.hh" |
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46 | #include "G4CollisionOutput.hh" |
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47 | #include "G4InuclElementaryParticle.hh" |
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48 | #include "G4InuclNuclei.hh" |
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49 | #include "G4InuclSpecialFunctions.hh" |
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50 | #include "G4LorentzConvertor.hh" |
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51 | #include <cmath> |
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52 | |
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53 | using namespace G4InuclSpecialFunctions; |
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54 | |
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55 | |
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56 | G4NonEquilibriumEvaporator::G4NonEquilibriumEvaporator() |
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57 | : G4CascadeColliderBase("G4NonEquilibriumEvaporator") {} |
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58 | |
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59 | |
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60 | void G4NonEquilibriumEvaporator::collide(G4InuclParticle* /*bullet*/, |
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61 | G4InuclParticle* target, |
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62 | G4CollisionOutput& output) { |
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63 | |
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64 | if (verboseLevel) { |
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65 | G4cout << " >>> G4NonEquilibriumEvaporator::collide" << G4endl; |
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66 | } |
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67 | |
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68 | // Sanity check |
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69 | G4InuclNuclei* nuclei_target = dynamic_cast<G4InuclNuclei*>(target); |
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70 | if (!nuclei_target) { |
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71 | G4cerr << " NonEquilibriumEvaporator -> target is not nuclei " << G4endl; |
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72 | return; |
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73 | } |
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74 | |
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75 | if (verboseLevel > 2) { |
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76 | G4cout << " evaporating target: " << G4endl; |
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77 | target->printParticle(); |
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78 | } |
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79 | |
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80 | const G4int a_cut = 5; |
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81 | const G4int z_cut = 3; |
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82 | |
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83 | const G4double eexs_cut = 0.1; |
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84 | |
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85 | const G4double coul_coeff = 1.4; |
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86 | const G4int itry_max = 1000; |
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87 | const G4double small_ekin = 1.0e-6; |
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88 | const G4double width_cut = 0.005; |
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89 | |
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90 | G4int A = nuclei_target->getA(); |
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91 | G4int Z = nuclei_target->getZ(); |
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92 | |
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93 | G4LorentzVector PEX = nuclei_target->getMomentum(); |
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94 | G4LorentzVector pin = PEX; // Save original four-vector for later |
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95 | |
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96 | G4double EEXS = nuclei_target->getExitationEnergy(); |
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97 | |
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98 | G4ExitonConfiguration config = nuclei_target->getExitonConfiguration(); |
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99 | |
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100 | G4int QPP = config.protonQuasiParticles; |
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101 | G4int QNP = config.neutronQuasiParticles; |
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102 | G4int QPH = config.protonHoles; |
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103 | G4int QNH = config.neutronHoles; |
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104 | |
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105 | G4int QP = QPP + QNP; |
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106 | G4int QH = QPH + QNH; |
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107 | G4int QEX = QP + QH; |
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108 | |
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109 | G4InuclElementaryParticle dummy(small_ekin, 1); |
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110 | G4LorentzConvertor toTheExitonSystemRestFrame; |
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111 | //*** toTheExitonSystemRestFrame.setVerbose(verboseLevel); |
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112 | toTheExitonSystemRestFrame.setBullet(dummy); |
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113 | |
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114 | G4double EFN = FermiEnergy(A, Z, 0); |
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115 | G4double EFP = FermiEnergy(A, Z, 1); |
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116 | |
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117 | G4int AR = A - QP; |
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118 | G4int ZR = Z - QPP; |
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119 | G4int NEX = QEX; |
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120 | G4LorentzVector ppout; |
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121 | G4bool try_again = (NEX > 0); |
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122 | |
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123 | // Buffer for parameter sets |
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124 | std::pair<G4double, G4double> parms; |
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125 | |
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126 | while (try_again) { |
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127 | if (A >= a_cut && Z >= z_cut && EEXS > eexs_cut) { // ok |
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128 | // update exiton system (include excitation energy!) |
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129 | G4double nuc_mass = G4InuclNuclei::getNucleiMass(A, Z, EEXS); |
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130 | PEX.setVectM(PEX.vect(), nuc_mass); |
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131 | toTheExitonSystemRestFrame.setTarget(PEX); |
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132 | toTheExitonSystemRestFrame.toTheTargetRestFrame(); |
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133 | |
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134 | if (verboseLevel > 2) { |
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135 | G4cout << " A " << A << " Z " << Z << " mass " << nuc_mass |
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136 | << " EEXS " << EEXS << G4endl; |
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137 | } |
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138 | |
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139 | G4double MEL = getMatrixElement(A); |
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140 | G4double E0 = getE0(A); |
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141 | G4double PL = getParLev(A, Z); |
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142 | G4double parlev = PL / A; |
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143 | G4double EG = PL * EEXS; |
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144 | |
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145 | if (QEX < std::sqrt(2.0 * EG)) { // ok |
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146 | if (verboseLevel > 3) |
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147 | G4cout << " QEX " << QEX << " < sqrt(2*EG) " << std::sqrt(2.*EG) |
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148 | << G4endl; |
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149 | |
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150 | paraMakerTruncated(Z, parms); |
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151 | const G4double& AK1 = parms.first; |
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152 | const G4double& CPA1 = parms.second; |
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153 | |
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154 | G4double VP = coul_coeff * Z * AK1 / (G4cbrt(A-1) + 1.0) / |
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155 | (1.0 + EEXS / E0); |
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156 | G4double DM1 = bindingEnergy(A,Z); |
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157 | G4double BN = DM1 - bindingEnergy(A-1,Z); |
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158 | G4double BP = DM1 - bindingEnergy(A-1,Z-1); |
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159 | G4double EMN = EEXS - BN; |
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160 | G4double EMP = EEXS - BP - VP * A / (A-1); |
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161 | G4double ESP = 0.0; |
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162 | |
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163 | if (EMN > eexs_cut) { // ok |
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164 | G4int icase = 0; |
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165 | |
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166 | if (NEX > 1) { |
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167 | G4double APH = 0.25 * (QP * QP + QH * QH + QP - 3 * QH); |
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168 | G4double APH1 = APH + 0.5 * (QP + QH); |
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169 | ESP = EEXS / QEX; |
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170 | G4double MELE = MEL / ESP / (A*A*A); |
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171 | |
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172 | if (ESP > 15.0) { |
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173 | MELE *= std::sqrt(15.0 / ESP); |
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174 | |
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175 | } else if(ESP < 7.0) { |
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176 | MELE *= std::sqrt(ESP / 7.0); |
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177 | |
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178 | if (ESP < 2.0) MELE *= std::sqrt(ESP / 2.0); |
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179 | }; |
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180 | |
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181 | G4double F1 = EG - APH; |
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182 | G4double F2 = EG - APH1; |
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183 | |
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184 | if (F1 > 0.0 && F2 > 0.0) { |
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185 | G4double F = F2 / F1; |
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186 | G4double M1 = 2.77 * MELE * PL; |
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187 | G4double D[3] = { 0., 0., 0. }; |
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188 | D[0] = M1 * F2 * F2 * std::pow(F, NEX-1) / (QEX+1); |
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189 | |
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190 | if (D[0] > 0.0) { |
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191 | |
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192 | if (NEX >= 2) { |
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193 | D[1] = 0.0462 / parlev / G4cbrt(A) * QP * EEXS / QEX; |
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194 | |
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195 | if (EMP > eexs_cut) |
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196 | D[2] = D[1] * std::pow(EMP / EEXS, NEX) * (1.0 + CPA1); |
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197 | D[1] *= std::pow(EMN / EEXS, NEX) * getAL(A); |
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198 | |
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199 | if (QNP < 1) D[1] = 0.0; |
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200 | if (QPP < 1) D[2] = 0.0; |
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201 | |
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202 | try_again = NEX > 1 && (D[1] > width_cut * D[0] || |
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203 | D[2] > width_cut * D[0]); |
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204 | |
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205 | if (try_again) { |
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206 | G4double D5 = D[0] + D[1] + D[2]; |
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207 | G4double SL = D5 * inuclRndm(); |
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208 | G4double S1 = 0.; |
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209 | |
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210 | for (G4int i = 0; i < 3; i++) { |
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211 | S1 += D[i]; |
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212 | if (SL <= S1) { |
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213 | icase = i; |
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214 | break; |
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215 | }; |
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216 | }; |
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217 | }; |
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218 | }; |
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219 | } else try_again = false; |
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220 | } else try_again = false; |
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221 | } |
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222 | |
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223 | if (try_again) { |
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224 | if (icase > 0) { // N -> N - 1 with particle escape |
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225 | if (verboseLevel > 3) |
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226 | G4cout << " try_again icase " << icase << G4endl; |
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227 | |
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228 | G4double V = 0.0; |
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229 | G4int ptype = 0; |
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230 | G4double B = 0.0; |
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231 | |
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232 | if (A < 3.0) try_again = false; |
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233 | |
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234 | if (try_again) { |
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235 | |
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236 | if (icase == 1) { // neutron escape |
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237 | |
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238 | if (QNP < 1) { |
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239 | icase = 0; |
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240 | |
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241 | } else { |
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242 | B = BN; |
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243 | V = 0.0; |
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244 | ptype = 2; |
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245 | }; |
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246 | |
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247 | } else { // proton esape |
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248 | if (QPP < 1) { |
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249 | icase = 0; |
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250 | |
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251 | } else { |
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252 | B = BP; |
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253 | V = VP; |
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254 | ptype = 1; |
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255 | |
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256 | if (Z-1 < 1) try_again = false; |
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257 | }; |
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258 | }; |
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259 | |
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260 | if (try_again && icase != 0) { |
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261 | G4double EB = EEXS - B; |
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262 | G4double E = EB - V * A / (A-1); |
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263 | |
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264 | if (E < 0.0) icase = 0; |
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265 | else { |
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266 | G4double E1 = EB - V; |
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267 | G4double EEXS_new = -1.; |
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268 | G4double EPART = 0.0; |
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269 | G4int itry1 = 0; |
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270 | G4bool bad = true; |
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271 | |
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272 | while (itry1 < itry_max && icase > 0 && bad) { |
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273 | itry1++; |
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274 | G4int itry = 0; |
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275 | |
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276 | while (EEXS_new < 0.0 && itry < itry_max) { |
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277 | itry++; |
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278 | G4double R = inuclRndm(); |
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279 | G4double X; |
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280 | |
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281 | if (NEX == 2) { |
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282 | X = 1.0 - std::sqrt(R); |
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283 | |
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284 | } else { |
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285 | G4double QEX2 = 1.0 / QEX; |
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286 | G4double QEX1 = 1.0 / (QEX-1); |
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287 | X = std::pow(0.5 * R, QEX2); |
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288 | |
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289 | for (G4int i = 0; i < 1000; i++) { |
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290 | G4double DX = X * QEX1 * |
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291 | (1.0 + QEX2 * X * (1.0 - R / std::pow(X, NEX)) / (1.0 - X)); |
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292 | X -= DX; |
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293 | |
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294 | if (std::fabs(DX / X) < 0.01) break; |
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295 | |
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296 | }; |
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297 | }; |
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298 | EPART = EB - X * E1; |
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299 | EEXS_new = EB - EPART * A / (A-1); |
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300 | } // while (EEXS_new < 0.0... |
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301 | |
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302 | if (itry == itry_max || EEXS_new < 0.0) { |
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303 | icase = 0; |
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304 | continue; |
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305 | } |
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306 | |
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307 | if (verboseLevel > 2) |
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308 | G4cout << " particle " << ptype << " escape " << G4endl; |
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309 | |
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310 | EPART /= GeV; // From MeV to GeV |
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311 | |
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312 | G4InuclElementaryParticle particle(ptype); |
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313 | particle.setModel(5); |
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314 | |
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315 | // generate particle momentum |
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316 | G4double mass = particle.getMass(); |
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317 | G4double pmod = std::sqrt(EPART * (2.0 * mass + EPART)); |
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318 | G4LorentzVector mom = generateWithRandomAngles(pmod,mass); |
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319 | |
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320 | // Push evaporated paricle into current rest frame |
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321 | mom = toTheExitonSystemRestFrame.backToTheLab(mom); |
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322 | |
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323 | // Adjust quasiparticle and nucleon counts |
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324 | G4int QPP_new = QPP; |
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325 | G4int QNP_new = QNP; |
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326 | |
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327 | G4int A_new = A-1; |
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328 | G4int Z_new = Z; |
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329 | |
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330 | if (ptype == 1) { |
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331 | QPP_new--; |
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332 | Z_new--; |
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333 | }; |
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334 | |
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335 | if (ptype == 2) QNP_new--; |
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336 | |
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337 | if (verboseLevel > 3) { |
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338 | G4cout << " nucleus px " << PEX.px() << " py " << PEX.py() |
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339 | << " pz " << PEX.pz() << " E " << PEX.e() << G4endl |
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340 | << " evaporate px " << mom.px() << " py " << mom.py() |
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341 | << " pz " << mom.pz() << " E " << mom.e() << G4endl; |
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342 | } |
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343 | |
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344 | // New excitation energy depends on residual nuclear state |
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345 | G4double mass_new = G4InuclNuclei::getNucleiMass(A_new, Z_new); |
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346 | |
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347 | G4double EEXS_new = ((PEX-mom).m() - mass_new)*GeV; |
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348 | if (EEXS_new < 0.) continue; // Sanity check for new nucleus |
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349 | |
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350 | if (verboseLevel > 3) |
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351 | G4cout << " EEXS_new " << EEXS_new << G4endl; |
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352 | |
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353 | PEX -= mom; |
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354 | EEXS = EEXS_new; |
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355 | |
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356 | A = A_new; |
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357 | Z = Z_new; |
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358 | |
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359 | NEX--; |
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360 | QEX--; |
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361 | QP--; |
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362 | QPP = QPP_new; |
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363 | QNP = QNP_new; |
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364 | |
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365 | particle.setMomentum(mom); |
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366 | output.addOutgoingParticle(particle); |
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367 | if (verboseLevel > 3) particle.printParticle(); |
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368 | |
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369 | ppout += mom; |
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370 | if (verboseLevel > 3) { |
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371 | G4cout << " ppout px " << ppout.px() << " py " << ppout.py() |
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372 | << " pz " << ppout.pz() << " E " << ppout.e() << G4endl; |
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373 | } |
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374 | |
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375 | bad = false; |
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376 | } // while (itry1<itry_max && icase>0 |
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377 | |
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378 | if (itry1 == itry_max) icase = 0; |
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379 | } // if (E < 0.) [else] |
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380 | } // if (try_again && icase != 0) |
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381 | } // if (try_again) |
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382 | } // if (icase > 0) |
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383 | |
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384 | if (icase == 0 && try_again) { // N -> N + 2 |
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385 | G4double TNN = 1.6 * EFN + ESP; |
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386 | G4double TNP = 1.6 * EFP + ESP; |
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387 | G4double XNUN = 1.0 / (1.6 + ESP / EFN); |
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388 | G4double XNUP = 1.0 / (1.6 + ESP / EFP); |
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389 | G4double SNN1 = csNN(TNP) * XNUP; |
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390 | G4double SNN2 = csNN(TNN) * XNUN; |
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391 | G4double SPN1 = csPN(TNP) * XNUP; |
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392 | G4double SPN2 = csPN(TNN) * XNUN; |
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393 | G4double PP = (QPP * SNN1 + QNP * SPN1) * ZR; |
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394 | G4double PN = (QPP * SPN2 + QNP * SNN2) * (AR - ZR); |
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395 | G4double PW = PP + PN; |
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396 | NEX += 2; |
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397 | QEX += 2; |
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398 | QP++; |
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399 | QH++; |
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400 | AR--; |
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401 | |
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402 | if (AR > 1) { |
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403 | G4double SL = PW * inuclRndm(); |
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404 | |
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405 | if (SL > PP) { |
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406 | QNP++; |
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407 | QNH++; |
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408 | } else { |
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409 | QPP++; |
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410 | QPH++; |
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411 | ZR--; |
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412 | if (ZR < 2) try_again = false; |
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413 | } |
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414 | } else try_again = false; |
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415 | } // if (icase==0 && try_again) |
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416 | } // if (try_again) |
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417 | } else try_again = false; // if (EMN > eexs_cut) |
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418 | } else try_again = false; // if (QEX < sqrg(2*EG) |
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419 | } else try_again = false; // if (A > a_cut ... |
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420 | } // while (try_again) |
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421 | |
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422 | // everything finished, set output nuclei |
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423 | |
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424 | if (output.numberOfOutgoingParticles() == 0) { |
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425 | output.addOutgoingNucleus(*nuclei_target); |
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426 | } else { |
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427 | G4LorentzVector pnuc = pin - ppout; |
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428 | G4InuclNuclei nuclei(pnuc, A, Z, EEXS, 5); |
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429 | |
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430 | if (verboseLevel > 3) { |
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431 | G4cout << " remaining nucleus " << G4endl; |
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432 | nuclei.printParticle(); |
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433 | } |
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434 | output.addOutgoingNucleus(nuclei); |
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435 | } |
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436 | |
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437 | validateOutput(0, target, output); // Check energy conservation, etc. |
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438 | return; |
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439 | } |
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440 | |
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441 | G4double G4NonEquilibriumEvaporator::getMatrixElement(G4int A) const { |
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442 | |
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443 | if (verboseLevel > 3) { |
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444 | G4cout << " >>> G4NonEquilibriumEvaporator::getMatrixElement" << G4endl; |
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445 | } |
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446 | |
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447 | G4double me; |
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448 | |
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449 | if (A > 150) me = 100.0; |
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450 | else if (A > 20) me = 140.0; |
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451 | else me = 70.0; |
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452 | |
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453 | return me; |
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454 | } |
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455 | |
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456 | G4double G4NonEquilibriumEvaporator::getE0(G4int ) const { |
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457 | if (verboseLevel > 3) { |
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458 | G4cout << " >>> G4NonEquilibriumEvaporator::getEO" << G4endl; |
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459 | } |
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460 | |
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461 | const G4double e0 = 200.0; |
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462 | |
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463 | return e0; |
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464 | } |
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465 | |
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466 | G4double G4NonEquilibriumEvaporator::getParLev(G4int A, |
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467 | G4int ) const { |
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468 | |
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469 | if (verboseLevel > 3) { |
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470 | G4cout << " >>> G4NonEquilibriumEvaporator::getParLev" << G4endl; |
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471 | } |
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472 | |
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473 | // const G4double par = 0.125; |
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474 | G4double pl = 0.125 * A; |
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475 | |
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476 | return pl; |
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477 | } |
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