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24 | // ******************************************************************** |
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25 | // |
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26 | // $Id: G4CrossSectionChargeDecreasePartial.cc,v 1.3 2009/06/10 13:32:36 mantero Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-03-cand-01 $ |
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28 | |
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29 | #include "G4CrossSectionChargeDecreasePartial.hh" |
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30 | |
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31 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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32 | |
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33 | G4CrossSectionChargeDecreasePartial::G4CrossSectionChargeDecreasePartial() |
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34 | { |
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35 | |
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36 | //PROTON |
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37 | f0[0][0]=1.; |
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38 | a0[0][0]=-0.180; |
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39 | a1[0][0]=-3.600; |
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40 | b0[0][0]=-18.22; |
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41 | b1[0][0]=-1.997; |
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42 | c0[0][0]=0.215; |
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43 | d0[0][0]=3.550; |
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44 | x0[0][0]=3.450; |
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45 | x1[0][0]=5.251; |
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46 | |
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47 | numberOfPartialCrossSections[0] = 1; |
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48 | |
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49 | //ALPHA++ |
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50 | f0[0][1]=1.; a0[0][1]=0.95; |
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51 | a1[0][1]=-2.75; |
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52 | b0[0][1]=-23.00; |
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53 | c0[0][1]=0.215; |
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54 | d0[0][1]=2.95; |
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55 | x0[0][1]=3.50; |
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56 | |
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57 | f0[1][1]=1.; |
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58 | a0[1][1]=0.95; |
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59 | a1[1][1]=-2.75; |
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60 | b0[1][1]=-23.73; |
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61 | c0[1][1]=0.250; |
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62 | d0[1][1]=3.55; |
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63 | x0[1][1]=3.72; |
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64 | |
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65 | x1[0][1]=-1.; |
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66 | b1[0][1]=-1.; |
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67 | |
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68 | x1[1][1]=-1.; |
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69 | b1[1][1]=-1.; |
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70 | |
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71 | numberOfPartialCrossSections[1] = 2; |
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72 | |
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73 | // ALPHA+ |
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74 | f0[0][2]=1.; |
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75 | a0[0][2]=0.65; |
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76 | a1[0][2]=-2.75; |
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77 | b0[0][2]=-21.81; |
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78 | c0[0][2]=0.232; |
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79 | d0[0][2]=2.95; |
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80 | x0[0][2]=3.53; |
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81 | |
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82 | x1[0][2]=-1.; |
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83 | b1[0][2]=-1.; |
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84 | |
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85 | numberOfPartialCrossSections[2] = 1; |
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86 | |
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87 | } |
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88 | |
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89 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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90 | |
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91 | G4CrossSectionChargeDecreasePartial::~G4CrossSectionChargeDecreasePartial() |
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92 | {} |
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93 | |
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94 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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95 | |
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96 | G4double G4CrossSectionChargeDecreasePartial::CrossSection(G4double k, G4int index, |
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97 | const G4ParticleDefinition* particleDefinition) |
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98 | { |
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99 | G4int particleTypeIndex = 0; |
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100 | G4DNAGenericIonsManager* instance; |
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101 | instance = G4DNAGenericIonsManager::Instance(); |
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102 | |
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103 | if (particleDefinition == G4Proton::ProtonDefinition()) particleTypeIndex=0; |
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104 | if (particleDefinition == instance->GetIon("alpha++")) particleTypeIndex=1; |
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105 | if (particleDefinition == instance->GetIon("alpha+")) particleTypeIndex=2; |
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106 | |
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107 | // |
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108 | // sigma(T) = f0 10 ^ y(log10(T/eV)) |
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109 | // |
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110 | // / a0 x + b0 x < x0 |
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111 | // | |
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112 | // y(x) = < a0 x + b0 - c0 (x - x0)^d0 x0 <= x < x1 |
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113 | // | |
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114 | // \ a1 x + b1 x >= x1 |
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115 | // |
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116 | // |
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117 | // f0, a0, a1, b0, b1, c0, d0, x0, x1 are parameters that change for protons and helium (0, +, ++) |
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118 | // |
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119 | // f0 has been added to the code in order to manage partial (shell-dependent) cross sections (if no shell dependence is present. f0=1. Sum of f0 over the considered shells should give 1) |
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120 | // |
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121 | // From Rad. Phys. and Chem. 59 (2000) 255-275, M. Dingfelder et al. |
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122 | // Inelastic-collision cross sections of liquid water for interactions of energetic proton |
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123 | // |
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124 | |
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125 | if (x1[index][particleTypeIndex]<x0[index][particleTypeIndex]) |
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126 | { |
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127 | // |
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128 | // if x1 < x0 means that x1 and b1 will be calculated with the following formula (this piece of code is run on all alphas and not on protons) |
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129 | // |
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130 | // x1 = x0 + ((a0 - a1)/(c0 * d0)) ^ (1 / (d0 - 1)) |
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131 | // |
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132 | // b1 = (a0 - a1) * x1 + b0 - c0 * (x1 - x0) ^ d0 |
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133 | // |
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134 | |
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135 | x1[index][particleTypeIndex]=x0[index][particleTypeIndex] + std::pow((a0[index][particleTypeIndex] - a1[index][particleTypeIndex]) |
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136 | / (c0[index][particleTypeIndex] * d0[index][particleTypeIndex]), 1. / (d0[index][particleTypeIndex] - 1.)); |
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137 | b1[index][particleTypeIndex]=(a0[index][particleTypeIndex] - a1[index][particleTypeIndex]) * x1[index][particleTypeIndex] |
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138 | + b0[index][particleTypeIndex] - c0[index][particleTypeIndex] * std::pow(x1[index][particleTypeIndex] |
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139 | - x0[index][particleTypeIndex], d0[index][particleTypeIndex]); |
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140 | } |
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141 | |
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142 | G4double x(std::log10(k/eV)); |
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143 | G4double y; |
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144 | |
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145 | if (x<x0[index][particleTypeIndex]) |
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146 | y=a0[index][particleTypeIndex] * x + b0[index][particleTypeIndex]; |
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147 | else if (x<x1[index][particleTypeIndex]) |
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148 | y=a0[index][particleTypeIndex] * x + b0[index][particleTypeIndex] - c0[index][particleTypeIndex] |
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149 | * std::pow(x - x0[index][particleTypeIndex], d0[index][particleTypeIndex]); |
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150 | else |
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151 | y=a1[index][particleTypeIndex] * x + b1[index][particleTypeIndex]; |
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152 | |
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153 | return f0[index][particleTypeIndex] * std::pow(10., y)*m*m; |
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154 | |
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155 | } |
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156 | |
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157 | G4int G4CrossSectionChargeDecreasePartial::RandomSelect(G4double k, |
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158 | const G4ParticleDefinition* particleDefinition) |
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159 | { |
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160 | G4int particleTypeIndex = 0; |
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161 | G4DNAGenericIonsManager *instance; |
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162 | instance = G4DNAGenericIonsManager::Instance(); |
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163 | |
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164 | if (particleDefinition == G4Proton::ProtonDefinition()) particleTypeIndex = 0; |
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165 | if (particleDefinition == instance->GetIon("alpha++")) particleTypeIndex = 1; |
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166 | if (particleDefinition == instance->GetIon("alpha+")) particleTypeIndex = 2; |
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167 | |
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168 | const G4int n = numberOfPartialCrossSections[particleTypeIndex]; |
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169 | G4double* values(new G4double[n]); |
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170 | G4double value(0); |
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171 | G4int i = n; |
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172 | |
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173 | while (i>0) |
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174 | { |
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175 | i--; |
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176 | values[i]=CrossSection(k, i, particleDefinition); |
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177 | value+=values[i]; |
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178 | } |
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179 | |
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180 | value*=G4UniformRand(); |
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181 | |
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182 | i=n; |
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183 | while (i>0) |
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184 | { |
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185 | i--; |
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186 | |
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187 | if (values[i]>value) |
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188 | break; |
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189 | |
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190 | value-=values[i]; |
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191 | } |
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192 | |
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193 | delete[] values; |
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194 | |
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195 | return i; |
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196 | } |
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197 | |
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198 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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199 | |
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200 | G4double G4CrossSectionChargeDecreasePartial::Sum(G4double k, const G4ParticleDefinition* particleDefinition) |
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201 | { |
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202 | G4int particleTypeIndex = 0; |
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203 | G4DNAGenericIonsManager* instance; |
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204 | instance = G4DNAGenericIonsManager::Instance(); |
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205 | |
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206 | if (particleDefinition == G4Proton::ProtonDefinition()) particleTypeIndex=0; |
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207 | if (particleDefinition == instance->GetIon("alpha++")) particleTypeIndex=1; |
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208 | if (particleDefinition == instance->GetIon("alpha+")) particleTypeIndex=2; |
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209 | |
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210 | G4double totalCrossSection = 0.; |
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211 | |
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212 | for (G4int i=0; i<numberOfPartialCrossSections[particleTypeIndex]; i++) |
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213 | { |
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214 | totalCrossSection += CrossSection(k,i,particleDefinition); |
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215 | } |
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216 | return totalCrossSection; |
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217 | } |
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