[968] | 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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| 26 | // |
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| 27 | // $Id: G4PreCompoundTriton.cc,v 1.5 2009/02/13 18:57:32 vnivanch Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
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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: G4PreCompoundTriton |
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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 "G4PreCompoundTriton.hh" |
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| 45 | |
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| 46 | |
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| 47 | G4ReactionProduct * G4PreCompoundTriton::GetReactionProduct() const |
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| 48 | { |
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| 49 | G4ReactionProduct * theReactionProduct = |
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| 50 | new G4ReactionProduct(G4Triton::TritonDefinition()); |
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| 51 | theReactionProduct->SetMomentum(GetMomentum().vect()); |
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| 52 | theReactionProduct->SetTotalEnergy(GetMomentum().e()); |
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| 53 | #ifdef PRECOMPOUND_TEST |
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| 54 | theReactionProduct->SetCreatorModel("G4PrecompoundModel"); |
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| 55 | #endif |
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| 56 | return theReactionProduct; |
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| 57 | } |
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| 58 | |
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| 59 | G4double G4PreCompoundTriton::FactorialFactor(const G4double N, const G4double P) |
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| 60 | { |
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| 61 | return |
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| 62 | (N-3.0)*(P-2.0)*( |
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| 63 | (((N-2.0)*(P-1.0))/2.0) *( |
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| 64 | (((N-1.0)*P)/3.0) |
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| 65 | ) |
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| 66 | ); |
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| 67 | } |
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| 68 | |
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| 69 | G4double G4PreCompoundTriton::CoalescenceFactor(const G4double A) |
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| 70 | { |
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| 71 | return 243.0/(A*A); |
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| 72 | } |
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| 73 | |
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| 74 | G4double G4PreCompoundTriton::GetRj(const G4int NumberParticles, const G4int NumberCharged) |
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| 75 | { |
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| 76 | G4double rj = 0.0; |
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| 77 | G4double denominator = NumberParticles*(NumberParticles-1)*(NumberParticles-2); |
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| 78 | if(NumberCharged >= 1 && (NumberParticles-NumberCharged) >= 2) { |
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| 79 | rj = 3.0*static_cast<G4double>(NumberCharged*(NumberParticles-NumberCharged)*(NumberParticles-NumberCharged-1)) |
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| 80 | /static_cast<G4double>(denominator); |
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| 81 | } |
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| 82 | return rj; |
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| 83 | } |
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| 84 | |
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| 85 | //////////////////////////////////////////////////////////////////////////////////// |
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| 86 | //J. M. Quesada (Dec 2007-June 2008): New inverse reaction cross sections |
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| 87 | //OPT=0 Dostrovski's parameterization |
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| 88 | //OPT=1,2 Chatterjee's paramaterization |
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| 89 | //OPT=3,4 Kalbach's parameterization |
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| 90 | // |
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| 91 | G4double G4PreCompoundTriton::CrossSection(const G4double K) |
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| 92 | { |
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| 93 | ResidualA=GetRestA(); |
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| 94 | ResidualZ=GetRestZ(); |
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| 95 | theA=GetA(); |
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| 96 | theZ=GetZ(); |
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| 97 | ResidualAthrd=std::pow(ResidualA,0.33333); |
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| 98 | FragmentA=GetA()+GetRestA(); |
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| 99 | FragmentAthrd=std::pow(FragmentA,0.33333); |
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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 TRITON 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 G4PreCompoundTriton::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 G4PreCompoundTriton::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 >= 70) |
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| 129 | { |
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| 130 | C = 0.10; |
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| 131 | } |
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| 132 | else |
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| 133 | { |
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| 134 | C = ((((0.15417e-06*aZ) - 0.29875e-04)*aZ + 0.21071e-02)*aZ - 0.66612e-01)*aZ + 0.98375; |
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| 135 | } |
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| 136 | |
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| 137 | return 1.0 + C/3.0; |
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| 138 | } |
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| 139 | // |
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| 140 | //------------- |
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| 141 | // |
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| 142 | G4double G4PreCompoundTriton::GetBeta() |
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| 143 | { |
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| 144 | return -GetCoulombBarrier(); |
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| 145 | } |
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| 146 | // |
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| 147 | //********************* OPT=1,2 : Chatterjee's cross section ************************ |
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| 148 | //(fitting to cross section from Bechetti & Greenles OM potential) |
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| 149 | |
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| 150 | G4double G4PreCompoundTriton::GetOpt12(const G4double K) |
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| 151 | { |
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| 152 | |
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| 153 | G4double Kc=K; |
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| 154 | |
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| 155 | // JMQ xsec is set constat above limit of validity |
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| 156 | if (K>50) Kc=50; |
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| 157 | |
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| 158 | G4double landa ,mu ,nu ,p , Ec,q,r,ji,xs; |
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| 159 | |
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| 160 | G4double p0 = -11.04; |
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| 161 | G4double p1 = 619.1; |
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| 162 | G4double p2 = -2147.; |
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| 163 | G4double landa0 = -0.0426; |
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| 164 | G4double landa1 = -10.33; |
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| 165 | G4double mu0 = 601.9; |
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| 166 | G4double mu1 = 0.37; |
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| 167 | G4double nu0 = 583.0; |
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| 168 | G4double nu1 = -546.2; |
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| 169 | G4double nu2 = 1.718; |
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| 170 | G4double delta=1.2; |
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| 171 | |
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| 172 | Ec = 1.44*theZ*ResidualZ/(1.5*ResidualAthrd+delta); |
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| 173 | p = p0 + p1/Ec + p2/(Ec*Ec); |
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| 174 | landa = landa0*ResidualA + landa1; |
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| 175 | mu = mu0*std::pow(ResidualA,mu1); |
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| 176 | nu = std::pow(ResidualA,mu1)*(nu0 + nu1*Ec + nu2*(Ec*Ec)); |
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| 177 | q = landa - nu/(Ec*Ec) - 2*p*Ec; |
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| 178 | r = mu + 2*nu/Ec + p*(Ec*Ec); |
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| 179 | |
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| 180 | ji=std::max(Kc,Ec); |
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| 181 | if(Kc < Ec) { xs = p*Kc*Kc + q*Kc + r;} |
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| 182 | else {xs = p*(Kc - ji)*(Kc - ji) + landa*Kc + mu + nu*(2 - Kc/ji)/ji ;} |
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| 183 | |
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| 184 | if (xs <0.0) {xs=0.0;} |
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| 185 | |
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| 186 | return xs; |
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| 187 | |
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| 188 | } |
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| 189 | |
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| 190 | // *********** OPT=3,4 : Kalbach's cross sections (from PRECO code)************* |
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| 191 | G4double G4PreCompoundTriton::GetOpt34(const G4double K) |
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| 192 | // ** t from o.m. of hafele, flynn et al |
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| 193 | { |
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| 194 | |
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| 195 | G4double landa, mu, nu, p , signor(1.),sig; |
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| 196 | G4double ec,ecsq,xnulam,etest(0.),a; |
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| 197 | G4double b,ecut,cut,ecut2,geom,elab; |
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| 198 | |
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| 199 | |
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| 200 | G4double flow = 1.e-18; |
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| 201 | G4double spill= 1.e+18; |
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| 202 | |
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| 203 | |
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| 204 | G4double p0 = -21.45; |
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| 205 | G4double p1 = 484.7; |
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| 206 | G4double p2 = -1608.; |
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| 207 | G4double landa0 = 0.0186; |
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| 208 | G4double landa1 = -8.90; |
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| 209 | G4double mu0 = 686.3; |
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| 210 | G4double mu1 = 0.325; |
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| 211 | G4double nu0 = 368.9; |
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| 212 | G4double nu1 = -522.2; |
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| 213 | G4double nu2 = -4.998; |
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| 214 | |
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| 215 | G4double ra=0.80; |
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| 216 | |
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| 217 | //JMQ 13/02/09 increase of reduced radius to lower the barrier |
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| 218 | // ec = 1.44 * theZ * ResidualZ / (1.5*ResidualAthrd+ra); |
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| 219 | ec = 1.44 * theZ * ResidualZ / (1.7*ResidualAthrd+ra); |
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| 220 | ecsq = ec * ec; |
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| 221 | p = p0 + p1/ec + p2/ecsq; |
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| 222 | landa = landa0*ResidualA + landa1; |
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| 223 | a = std::pow(ResidualA,mu1); |
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| 224 | mu = mu0 * a; |
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| 225 | nu = a* (nu0+nu1*ec+nu2*ecsq); |
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| 226 | xnulam = nu / landa; |
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| 227 | if (xnulam > spill) xnulam=0.; |
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| 228 | if (xnulam >= flow) etest = 1.2 *std::sqrt(xnulam); |
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| 229 | |
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| 230 | a = -2.*p*ec + landa - nu/ecsq; |
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| 231 | b = p*ecsq + mu + 2.*nu/ec; |
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| 232 | ecut = 0.; |
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| 233 | cut = a*a - 4.*p*b; |
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| 234 | if (cut > 0.) ecut = std::sqrt(cut); |
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| 235 | ecut = (ecut-a) / (p+p); |
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| 236 | ecut2 = ecut; |
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| 237 | if (cut < 0.) ecut2 = ecut - 2.; |
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| 238 | elab = K * FragmentA / ResidualA; |
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| 239 | sig = 0.; |
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| 240 | |
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| 241 | if (elab <= ec) { //start for E<Ec |
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| 242 | if (elab > ecut2) sig = (p*elab*elab+a*elab+b) * signor; |
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| 243 | } //end for E<Ec |
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| 244 | else { //start for E>Ec |
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| 245 | sig = (landa*elab+mu+nu/elab) * signor; |
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| 246 | geom = 0.; |
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| 247 | if (xnulam < flow || elab < etest) return sig; |
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| 248 | geom = std::sqrt(theA*K); |
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| 249 | geom = 1.23*ResidualAthrd + ra + 4.573/geom; |
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| 250 | geom = 31.416 * geom * geom; |
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| 251 | sig = std::max(geom,sig); |
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| 252 | } //end for E>Ec |
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| 253 | return sig; |
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| 254 | |
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| 255 | } |
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| 256 | |
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| 257 | // ************************** end of cross sections ******************************* |
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