[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 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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[962] | 26 | //J.M. Quesada (August2008). Based on: |
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[819] | 27 | // |
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| 28 | // Hadronic Process: Nuclear De-excitations |
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[962] | 29 | // by V. Lara (Oct 1998) |
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[819] | 30 | // |
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[962] | 31 | // Modif (03 September 2008) by J. M. Quesada for external choice of inverse |
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| 32 | // cross section option |
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[819] | 33 | |
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| 34 | #include "G4TritonEvaporationProbability.hh" |
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| 35 | |
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| 36 | G4TritonEvaporationProbability::G4TritonEvaporationProbability() : |
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[962] | 37 | G4EvaporationProbability(3,1,2,&theCoulombBarrier) // A,Z,Gamma,&theCoulombBarrier |
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[819] | 38 | { |
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| 39 | |
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| 40 | } |
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| 41 | |
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| 42 | G4TritonEvaporationProbability::G4TritonEvaporationProbability(const G4TritonEvaporationProbability &) : G4EvaporationProbability() |
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| 43 | { |
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| 44 | throw G4HadronicException(__FILE__, __LINE__, "G4TritonEvaporationProbability::copy_constructor meant to not be accessable"); |
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| 45 | } |
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| 46 | |
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| 47 | |
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| 48 | |
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| 49 | |
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| 50 | const G4TritonEvaporationProbability & G4TritonEvaporationProbability:: |
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| 51 | operator=(const G4TritonEvaporationProbability &) |
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| 52 | { |
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| 53 | throw G4HadronicException(__FILE__, __LINE__, "G4TritonEvaporationProbability::operator= meant to not be accessable"); |
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| 54 | return *this; |
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| 55 | } |
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| 56 | |
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| 57 | |
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| 58 | G4bool G4TritonEvaporationProbability::operator==(const G4TritonEvaporationProbability &) const |
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| 59 | { |
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| 60 | return false; |
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| 61 | } |
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| 62 | |
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| 63 | G4bool G4TritonEvaporationProbability::operator!=(const G4TritonEvaporationProbability &) const |
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| 64 | { |
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| 65 | return true; |
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| 66 | } |
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| 67 | |
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[962] | 68 | G4double G4TritonEvaporationProbability::CalcAlphaParam(const G4Fragment & fragment) |
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| 69 | { return 1.0 + CCoeficient(static_cast<G4double>(fragment.GetZ()-GetZ()));} |
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| 70 | |
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| 71 | G4double G4TritonEvaporationProbability::CalcBetaParam(const G4Fragment & ) |
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| 72 | { return 0.0; } |
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| 73 | |
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| 74 | G4double G4TritonEvaporationProbability::CCoeficient(const G4double aZ) |
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[819] | 75 | { |
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| 76 | // Data comes from |
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| 77 | // Dostrovsky, Fraenkel and Friedlander |
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| 78 | // Physical Review, vol 116, num. 3 1959 |
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| 79 | // |
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| 80 | // const G4int size = 5; |
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| 81 | // G4double Zlist[5] = { 10.0, 20.0, 30.0, 50.0, 70.0}; |
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| 82 | // G4double Cp[5] = { 0.50, 0.28, 0.20, 0.15, 0.10}; |
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| 83 | // C for triton is equal to C for protons divided by 3 |
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| 84 | G4double C = 0.0; |
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| 85 | |
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| 86 | if (aZ >= 70) { |
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| 87 | C = 0.10; |
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| 88 | } else { |
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| 89 | C = ((((0.15417e-06*aZ) - 0.29875e-04)*aZ + 0.21071e-02)*aZ - 0.66612e-01)*aZ + 0.98375; |
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| 90 | } |
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| 91 | |
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| 92 | return C/3.0; |
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| 93 | |
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| 94 | } |
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[962] | 95 | |
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| 96 | /////////////////////////////////////////////////////////////////////////////////// |
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| 97 | //J. M. Quesada (Dec 2007-June 2008): New inverse reaction cross sections |
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| 98 | //OPT=0 Dostrovski's parameterization |
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| 99 | //OPT=1,2 Chatterjee's paramaterization |
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| 100 | //OPT=3,4 Kalbach's parameterization |
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| 101 | // |
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[1055] | 102 | G4double G4TritonEvaporationProbability::CrossSection(const G4Fragment & fragment, const G4double K) |
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[962] | 103 | { |
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| 104 | theA=GetA(); |
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| 105 | theZ=GetZ(); |
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| 106 | ResidualA=fragment.GetA()-theA; |
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| 107 | ResidualZ=fragment.GetZ()-theZ; |
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| 108 | |
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| 109 | ResidualAthrd=std::pow(ResidualA,0.33333); |
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| 110 | FragmentA=fragment.GetA(); |
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| 111 | FragmentAthrd=std::pow(FragmentA,0.33333); |
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| 112 | |
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| 113 | |
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| 114 | if (OPTxs==0) {std::ostringstream errOs; |
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[1055] | 115 | errOs << "We should'n be here (OPT =0) at evaporation cross section calculation (tritons)!!" |
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| 116 | <<G4endl; |
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[962] | 117 | throw G4HadronicException(__FILE__, __LINE__, errOs.str()); |
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| 118 | return 0.;} |
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| 119 | if( OPTxs==1 || OPTxs==2) return G4TritonEvaporationProbability::GetOpt12( K); |
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| 120 | else if (OPTxs==3 || OPTxs==4) return G4TritonEvaporationProbability::GetOpt34( K); |
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| 121 | else{ |
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| 122 | std::ostringstream errOs; |
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| 123 | errOs << "BAD Triton CROSS SECTION OPTION AT EVAPORATION!!" <<G4endl; |
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| 124 | throw G4HadronicException(__FILE__, __LINE__, errOs.str()); |
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| 125 | return 0.; |
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| 126 | } |
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| 127 | } |
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| 128 | |
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| 129 | // |
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| 130 | //********************* OPT=1,2 : Chatterjee's cross section ************************ |
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| 131 | //(fitting to cross section from Bechetti & Greenles OM potential) |
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| 132 | |
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| 133 | G4double G4TritonEvaporationProbability::GetOpt12(const G4double K) |
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| 134 | { |
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| 135 | |
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| 136 | G4double Kc=K; |
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| 137 | |
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| 138 | // JMQ xsec is set constat above limit of validity |
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| 139 | if (K>50) Kc=50; |
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| 140 | |
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| 141 | G4double landa ,mu ,nu ,p , Ec,q,r,ji,xs; |
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| 142 | //G4double Eo(0),epsilon1(0),epsilon2(0),discri(0); |
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| 143 | |
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| 144 | |
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| 145 | G4double p0 = -11.04; |
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| 146 | G4double p1 = 619.1; |
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| 147 | G4double p2 = -2147.; |
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| 148 | G4double landa0 = -0.0426; |
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| 149 | G4double landa1 = -10.33; |
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| 150 | G4double mu0 = 601.9; |
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| 151 | G4double mu1 = 0.37; |
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| 152 | G4double nu0 = 583.0; |
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| 153 | G4double nu1 = -546.2; |
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| 154 | G4double nu2 = 1.718; |
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| 155 | G4double delta=1.2; |
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| 156 | |
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| 157 | Ec = 1.44*theZ*ResidualZ/(1.5*ResidualAthrd+delta); |
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| 158 | p = p0 + p1/Ec + p2/(Ec*Ec); |
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| 159 | landa = landa0*ResidualA + landa1; |
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| 160 | mu = mu0*std::pow(ResidualA,mu1); |
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| 161 | nu = std::pow(ResidualA,mu1)*(nu0 + nu1*Ec + nu2*(Ec*Ec)); |
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| 162 | q = landa - nu/(Ec*Ec) - 2*p*Ec; |
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| 163 | r = mu + 2*nu/Ec + p*(Ec*Ec); |
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| 164 | |
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| 165 | ji=std::max(Kc,Ec); |
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| 166 | if(Kc < Ec) { xs = p*Kc*Kc + q*Kc + r;} |
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| 167 | else {xs = p*(Kc - ji)*(Kc - ji) + landa*Kc + mu + nu*(2 - Kc/ji)/ji ;} |
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| 168 | |
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| 169 | if (xs <0.0) {xs=0.0;} |
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| 170 | |
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| 171 | return xs; |
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| 172 | |
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| 173 | } |
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| 174 | |
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| 175 | // *********** OPT=3,4 : Kalbach's cross sections (from PRECO code)************* |
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| 176 | G4double G4TritonEvaporationProbability::GetOpt34(const G4double K) |
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| 177 | // ** t from o.m. of hafele, flynn et al |
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| 178 | { |
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| 179 | |
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| 180 | G4double landa, mu, nu, p , signor(1.),sig; |
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| 181 | G4double ec,ecsq,xnulam,etest(0.),a; |
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| 182 | G4double b,ecut,cut,ecut2,geom,elab; |
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| 183 | |
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| 184 | |
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| 185 | G4double flow = 1.e-18; |
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| 186 | G4double spill= 1.e+18; |
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| 187 | |
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| 188 | G4double p0 = -21.45; |
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| 189 | G4double p1 = 484.7; |
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| 190 | G4double p2 = -1608.; |
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| 191 | G4double landa0 = 0.0186; |
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| 192 | G4double landa1 = -8.90; |
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| 193 | G4double mu0 = 686.3; |
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| 194 | G4double mu1 = 0.325; |
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| 195 | G4double nu0 = 368.9; |
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| 196 | G4double nu1 = -522.2; |
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| 197 | G4double nu2 = -4.998; |
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| 198 | |
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| 199 | G4double ra=0.80; |
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| 200 | |
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[1055] | 201 | //JMQ 13/02/09 increase of reduced radius to lower the barrier |
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| 202 | // ec = 1.44 * theZ * ResidualZ / (1.5*ResidualAthrd+ra); |
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| 203 | ec = 1.44 * theZ * ResidualZ / (1.7*ResidualAthrd+ra); |
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[962] | 204 | ecsq = ec * ec; |
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| 205 | p = p0 + p1/ec + p2/ecsq; |
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| 206 | landa = landa0*ResidualA + landa1; |
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| 207 | a = std::pow(ResidualA,mu1); |
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| 208 | mu = mu0 * a; |
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| 209 | nu = a* (nu0+nu1*ec+nu2*ecsq); |
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| 210 | xnulam = nu / landa; |
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| 211 | if (xnulam > spill) xnulam=0.; |
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| 212 | if (xnulam >= flow) etest = 1.2 *std::sqrt(xnulam); |
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| 213 | |
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| 214 | a = -2.*p*ec + landa - nu/ecsq; |
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| 215 | b = p*ecsq + mu + 2.*nu/ec; |
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| 216 | ecut = 0.; |
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| 217 | cut = a*a - 4.*p*b; |
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| 218 | if (cut > 0.) ecut = std::sqrt(cut); |
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| 219 | ecut = (ecut-a) / (p+p); |
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| 220 | ecut2 = ecut; |
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| 221 | if (cut < 0.) ecut2 = ecut - 2.; |
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| 222 | elab = K * FragmentA / ResidualA; |
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| 223 | sig = 0.; |
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[1055] | 224 | |
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[962] | 225 | if (elab <= ec) { //start for E<Ec |
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[1055] | 226 | if (elab > ecut2) sig = (p*elab*elab+a*elab+b) * signor; |
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[962] | 227 | } //end for E<Ec |
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[1055] | 228 | else { //start for E>Ec |
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[962] | 229 | sig = (landa*elab+mu+nu/elab) * signor; |
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| 230 | geom = 0.; |
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| 231 | if (xnulam < flow || elab < etest) return sig; |
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| 232 | geom = std::sqrt(theA*K); |
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| 233 | geom = 1.23*ResidualAthrd + ra + 4.573/geom; |
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| 234 | geom = 31.416 * geom * geom; |
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| 235 | sig = std::max(geom,sig); |
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| 236 | } //end for E>Ec |
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| 237 | return sig; |
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| 238 | |
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| 239 | } |
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| 240 | |
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| 241 | // ************************** end of cross sections ******************************* |
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| 242 | |
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