1 | // |
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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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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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16 | // * for the full disclaimer and the limitation of liability. * |
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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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22 | // * use in resulting scientific publications, and indicate your * |
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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 | // |
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27 | // $Id: G4PreCompoundHe3.cc,v 1.5 2009/02/13 18:57:32 vnivanch Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-03-beta-cand-01 $ |
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29 | // |
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30 | // ------------------------------------------------------------------- |
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31 | // |
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32 | // GEANT4 Class file |
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33 | // |
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34 | // |
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35 | // File name: G4PreCompoundHe3 |
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36 | // |
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37 | // Author: V.Lara |
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38 | // |
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39 | // Modified: |
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40 | // 21.08.2008 J. M. Quesada add choice of options |
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41 | // 10.02.2009 J. M. Quesada set default opt1 |
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42 | // |
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43 | |
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44 | #include "G4PreCompoundHe3.hh" |
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45 | |
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46 | G4ReactionProduct * G4PreCompoundHe3::GetReactionProduct() const |
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47 | { |
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48 | G4ReactionProduct * theReactionProduct = |
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49 | new G4ReactionProduct(G4He3::He3Definition()); |
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50 | theReactionProduct->SetMomentum(GetMomentum().vect()); |
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51 | theReactionProduct->SetTotalEnergy(GetMomentum().e()); |
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52 | #ifdef PRECOMPOUND_TEST |
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53 | theReactionProduct->SetCreatorModel("G4PrecompoundModel"); |
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54 | #endif |
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55 | return theReactionProduct; |
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56 | } |
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57 | |
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58 | G4double G4PreCompoundHe3::FactorialFactor(const G4double N, const G4double P) |
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59 | { |
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60 | return |
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61 | (N-3.0)*(P-2.0)*( |
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62 | (((N-2.0)*(P-1.0))/2.0) *( |
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63 | (((N-1.0)*P)/3.0) |
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64 | ) |
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65 | ); |
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66 | } |
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67 | |
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68 | G4double G4PreCompoundHe3::CoalescenceFactor(const G4double A) |
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69 | { |
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70 | return 243.0/(A*A); |
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71 | } |
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72 | |
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73 | G4double G4PreCompoundHe3::GetRj(const G4int NumberParticles, const G4int NumberCharged) |
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74 | { |
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75 | G4double rj = 0.0; |
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76 | G4double denominator = NumberParticles*(NumberParticles-1)*(NumberParticles-2); |
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77 | if(NumberCharged >=2 && (NumberParticles-NumberCharged) >= 1) { |
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78 | rj = 3.0*static_cast<G4double>(NumberCharged*(NumberCharged-1)*(NumberParticles-NumberCharged)) |
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79 | / static_cast<G4double>(denominator); |
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80 | } |
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81 | return rj; |
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82 | } |
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83 | |
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84 | //////////////////////////////////////////////////////////////////////////////////// |
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85 | //J. M. Quesada (Dec 2007-June 2008): New inverse reaction cross sections |
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86 | //OPT=0 Dostrovski's parameterization |
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87 | //OPT=1,2 Chatterjee's paramaterization |
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88 | //OPT=3,4 Kalbach's parameterization |
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89 | // |
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90 | G4double G4PreCompoundHe3::CrossSection(const G4double K) |
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91 | { |
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92 | ResidualA=GetRestA(); |
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93 | ResidualZ=GetRestZ(); |
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94 | theA=GetA(); |
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95 | theZ=GetZ(); |
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96 | ResidualAthrd=std::pow(ResidualA,0.33333); |
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97 | FragmentA=GetA()+GetRestA(); |
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98 | FragmentAthrd=std::pow(FragmentA,0.33333); |
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99 | |
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100 | |
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101 | if (OPTxs==0) return GetOpt0( K); |
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102 | else if( OPTxs==1 || OPTxs==2) return GetOpt12( K); |
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103 | else if (OPTxs==3 || OPTxs==4) return GetOpt34( K); |
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104 | else{ |
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105 | std::ostringstream errOs; |
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106 | errOs << "BAD He3 CROSS SECTION OPTION !!" <<G4endl; |
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107 | throw G4HadronicException(__FILE__, __LINE__, errOs.str()); |
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108 | return 0.; |
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109 | } |
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110 | } |
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111 | |
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112 | // *********************** OPT=0 : Dostrovski's cross section ***************************** |
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113 | |
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114 | G4double G4PreCompoundHe3::GetOpt0(const G4double K) |
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115 | { |
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116 | const G4double r0 = G4PreCompoundParameters::GetAddress()->Getr0(); |
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117 | // cross section is now given in mb (r0 is in mm) for the sake of consistency |
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118 | //with the rest of the options |
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119 | return 1.e+25*pi*(r0*ResidualAthrd)*(r0*ResidualAthrd)*GetAlpha()*(1.+GetBeta()/K); |
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120 | } |
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121 | // |
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122 | //---------------- |
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123 | // |
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124 | G4double G4PreCompoundHe3::GetAlpha() |
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125 | { |
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126 | G4double C = 0.0; |
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127 | G4double aZ = GetZ() + GetRestZ(); |
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128 | if (aZ <= 30) |
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129 | { |
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130 | C = 0.10; |
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131 | } |
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132 | else if (aZ <= 50) |
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133 | { |
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134 | C = 0.1 + -((aZ-50.)/20.)*0.02; |
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135 | } |
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136 | else if (aZ < 70) |
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137 | { |
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138 | C = 0.08 + -((aZ-70.)/20.)*0.02; |
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139 | } |
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140 | else |
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141 | { |
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142 | C = 0.06; |
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143 | } |
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144 | return 1.0 + C*(4.0/3.0); |
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145 | } |
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146 | // |
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147 | //-------------------- |
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148 | // |
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149 | G4double G4PreCompoundHe3::GetBeta() |
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150 | { |
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151 | return -GetCoulombBarrier(); |
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152 | } |
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153 | // |
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154 | //********************* OPT=1,2 : Chatterjee's cross section ************************ |
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155 | //(fitting to cross section from Bechetti & Greenles OM potential) |
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156 | |
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157 | G4double G4PreCompoundHe3::GetOpt12(const G4double K) |
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158 | { |
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159 | |
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160 | G4double Kc=K; |
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161 | |
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162 | // JMQ xsec is set constat above limit of validity |
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163 | if (K>50) Kc=50; |
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164 | |
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165 | G4double landa ,mu ,nu ,p , Ec,q,r,ji,xs; |
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166 | |
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167 | G4double p0 = -3.06; |
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168 | G4double p1 = 278.5; |
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169 | G4double p2 = -1389.; |
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170 | G4double landa0 = -0.00535; |
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171 | G4double landa1 = -11.16; |
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172 | G4double mu0 = 555.5; |
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173 | G4double mu1 = 0.40; |
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174 | G4double nu0 = 687.4; |
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175 | G4double nu1 = -476.3; |
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176 | G4double nu2 = 0.509; |
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177 | G4double delta=1.2; |
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178 | |
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179 | Ec = 1.44*theZ*ResidualZ/(1.5*ResidualAthrd+delta); |
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180 | p = p0 + p1/Ec + p2/(Ec*Ec); |
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181 | landa = landa0*ResidualA + landa1; |
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182 | mu = mu0*std::pow(ResidualA,mu1); |
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183 | nu = std::pow(ResidualA,mu1)*(nu0 + nu1*Ec + nu2*(Ec*Ec)); |
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184 | q = landa - nu/(Ec*Ec) - 2*p*Ec; |
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185 | r = mu + 2*nu/Ec + p*(Ec*Ec); |
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186 | |
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187 | ji=std::max(Kc,Ec); |
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188 | if(Kc < Ec) { xs = p*Kc*Kc + q*Kc + r;} |
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189 | else {xs = p*(Kc - ji)*(Kc - ji) + landa*Kc + mu + nu*(2 - Kc/ji)/ji ;} |
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190 | |
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191 | if (xs <0.0) {xs=0.0;} |
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192 | |
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193 | return xs; |
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194 | |
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195 | } |
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196 | |
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197 | // *********** OPT=3,4 : Kalbach's cross sections (from PRECO code)************* |
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198 | G4double G4PreCompoundHe3::GetOpt34(const G4double K) |
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199 | //c ** 3he from o.m. of gibson et al |
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200 | { |
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201 | |
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202 | G4double landa, mu, nu, p , signor(1.),sig; |
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203 | G4double ec,ecsq,xnulam,etest(0.),a; |
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204 | G4double b,ecut,cut,ecut2,geom,elab; |
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205 | |
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206 | |
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207 | G4double flow = 1.e-18; |
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208 | G4double spill= 1.e+18; |
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209 | |
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210 | |
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211 | G4double p0 = -2.88; |
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212 | G4double p1 = 205.6; |
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213 | G4double p2 = -1487.; |
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214 | G4double landa0 = 0.00459; |
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215 | G4double landa1 = -8.93; |
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216 | G4double mu0 = 611.2; |
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217 | G4double mu1 = 0.35; |
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218 | G4double nu0 = 473.8; |
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219 | G4double nu1 = -468.2; |
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220 | G4double nu2 = -2.225; |
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221 | |
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222 | G4double ra=0.80; |
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223 | |
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224 | //JMQ 13/02/09 increase of reduced radius to lower the barrier |
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225 | // ec = 1.44 * theZ * ResidualZ / (1.5*ResidualAthrd+ra); |
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226 | ec = 1.44 * theZ * ResidualZ / (1.7*ResidualAthrd+ra); |
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227 | ecsq = ec * ec; |
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228 | p = p0 + p1/ec + p2/ecsq; |
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229 | landa = landa0*ResidualA + landa1; |
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230 | a = std::pow(ResidualA,mu1); |
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231 | mu = mu0 * a; |
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232 | nu = a* (nu0+nu1*ec+nu2*ecsq); |
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233 | xnulam = nu / landa; |
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234 | if (xnulam > spill) xnulam=0.; |
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235 | if (xnulam >= flow) etest = 1.2 *std::sqrt(xnulam); |
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236 | |
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237 | a = -2.*p*ec + landa - nu/ecsq; |
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238 | b = p*ecsq + mu + 2.*nu/ec; |
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239 | ecut = 0.; |
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240 | cut = a*a - 4.*p*b; |
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241 | if (cut > 0.) ecut = std::sqrt(cut); |
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242 | ecut = (ecut-a) / (p+p); |
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243 | ecut2 = ecut; |
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244 | if (cut < 0.) ecut2 = ecut - 2.; |
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245 | elab = K * FragmentA / ResidualA; |
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246 | sig = 0.; |
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247 | |
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248 | if (elab <= ec) { //start for E<Ec |
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249 | if (elab > ecut2) sig = (p*elab*elab+a*elab+b) * signor; |
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250 | } //end for E<Ec |
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251 | else { //start for E>Ec |
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252 | sig = (landa*elab+mu+nu/elab) * signor; |
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253 | geom = 0.; |
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254 | if (xnulam < flow || elab < etest) return sig; |
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255 | geom = std::sqrt(theA*K); |
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256 | geom = 1.23*ResidualAthrd + ra + 4.573/geom; |
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257 | geom = 31.416 * geom * geom; |
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258 | sig = std::max(geom,sig); |
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259 | } //end for E>Ec |
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260 | return sig; |
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261 | |
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262 | } |
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263 | |
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264 | // ************************** end of cross sections ******************************* |
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265 | |
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266 | |
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267 | |
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268 | |
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