[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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[1340] | 26 | // $Id: G4PreCompoundDeuteron.cc,v 1.7 2010/08/28 15:16:55 vnivanch Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-03-ref-09 $ |
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[1055] | 28 | // |
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| 29 | // ------------------------------------------------------------------- |
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| 30 | // |
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| 31 | // GEANT4 Class file |
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| 32 | // |
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| 33 | // |
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| 34 | // File name: G4PreCompoundDeuteron |
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| 35 | // |
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| 36 | // Author: V.Lara |
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| 37 | // |
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| 38 | // Modified: |
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| 39 | // 21.08.2008 J. M. Quesada add choice of options |
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[1340] | 40 | // 20.08.2010 V.Ivanchenko added G4Pow and G4PreCompoundParameters pointers |
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| 41 | // use int Z and A and cleanup |
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[1055] | 42 | // |
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[968] | 43 | |
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| 44 | #include "G4PreCompoundDeuteron.hh" |
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[1340] | 45 | #include "G4Deuteron.hh" |
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[968] | 46 | |
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[1340] | 47 | G4PreCompoundDeuteron::G4PreCompoundDeuteron() |
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| 48 | : G4PreCompoundIon(G4Deuteron::Deuteron(), &theDeuteronCoulombBarrier) |
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| 49 | {} |
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[968] | 50 | |
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[1340] | 51 | G4PreCompoundDeuteron::~G4PreCompoundDeuteron() |
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| 52 | {} |
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[968] | 53 | |
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[1340] | 54 | G4double G4PreCompoundDeuteron::FactorialFactor(G4int N, G4int P) |
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[1055] | 55 | { |
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[1340] | 56 | return G4double((N-1)*(N-2)*(P-1)*P)/2.0; |
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[1055] | 57 | } |
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[968] | 58 | |
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[1340] | 59 | G4double G4PreCompoundDeuteron::CoalescenceFactor(G4int A) |
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[1055] | 60 | { |
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[1340] | 61 | return 16.0/G4double(A); |
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[1055] | 62 | } |
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[968] | 63 | |
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[1340] | 64 | G4double G4PreCompoundDeuteron::GetRj(G4int nParticles, const G4int nCharged) |
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[1055] | 65 | { |
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| 66 | G4double rj = 0.0; |
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[1340] | 67 | if(nCharged >=1 && (nParticles-nCharged) >=1) { |
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| 68 | G4double denominator = G4double(nParticles*(nParticles-1)); |
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| 69 | rj = 2*nCharged*(nParticles-nCharged)/denominator; |
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[968] | 70 | } |
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[1055] | 71 | return rj; |
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| 72 | } |
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[968] | 73 | |
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[1340] | 74 | //////////////////////////////////////////////////////////////////////////////// |
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[968] | 75 | //J. M. Quesada (Dec 2007-June 2008): New inverse reaction cross sections |
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| 76 | //OPT=0 Dostrovski's parameterization |
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| 77 | //OPT=1,2 Chatterjee's paramaterization |
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| 78 | //OPT=3,4 Kalbach's parameterization |
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| 79 | // |
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[1340] | 80 | G4double G4PreCompoundDeuteron::CrossSection(G4double K) |
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[968] | 81 | { |
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[1340] | 82 | ResidualA = GetRestA(); |
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| 83 | ResidualZ = GetRestZ(); |
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| 84 | theA = GetA(); |
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| 85 | theZ = GetZ(); |
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| 86 | ResidualAthrd = ResidualA13(); |
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| 87 | FragmentA = theA + ResidualA; |
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| 88 | FragmentAthrd = g4pow->Z13(FragmentA); |
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[968] | 89 | |
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[1340] | 90 | if (OPTxs==0) { return GetOpt0( K); } |
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| 91 | else if( OPTxs==1 || OPTxs==2) { return GetOpt12( K); } |
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| 92 | else if (OPTxs==3 || OPTxs==4) { return GetOpt34( K); } |
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[968] | 93 | else{ |
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| 94 | std::ostringstream errOs; |
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| 95 | errOs << "BAD DEUTERON CROSS SECTION OPTION !!" <<G4endl; |
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| 96 | throw G4HadronicException(__FILE__, __LINE__, errOs.str()); |
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| 97 | return 0.; |
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| 98 | } |
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| 99 | } |
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| 100 | |
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[1055] | 101 | G4double G4PreCompoundDeuteron::GetAlpha() |
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| 102 | { |
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| 103 | G4double C = 0.0; |
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[1340] | 104 | G4int aZ = theZ + ResidualZ; |
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[1055] | 105 | if (aZ >= 70) |
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| 106 | { |
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| 107 | C = 0.10; |
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| 108 | } |
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| 109 | else |
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| 110 | { |
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| 111 | C = ((((0.15417e-06*aZ) - 0.29875e-04)*aZ + 0.21071e-02)*aZ - 0.66612e-01)*aZ + 0.98375; |
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| 112 | } |
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| 113 | return 1.0 + C/2.0; |
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| 114 | } |
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[968] | 115 | // |
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[1340] | 116 | //********************* OPT=1,2 : Chatterjee's cross section ******************** |
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[968] | 117 | //(fitting to cross section from Bechetti & Greenles OM potential) |
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| 118 | |
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[1340] | 119 | G4double G4PreCompoundDeuteron::GetOpt12(G4double K) |
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[968] | 120 | { |
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[1340] | 121 | G4double Kc = K; |
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[968] | 122 | |
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[1340] | 123 | // JMQ xsec is set constat above limit of validity |
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| 124 | if (K > 50*MeV) { Kc = 50*MeV; } |
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[968] | 125 | |
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| 126 | G4double landa ,mu ,nu ,p , Ec,q,r,ji,xs; |
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| 127 | |
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| 128 | G4double p0 = -38.21; |
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| 129 | G4double p1 = 922.6; |
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| 130 | G4double p2 = -2804.; |
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| 131 | G4double landa0 = -0.0323; |
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| 132 | G4double landa1 = -5.48; |
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| 133 | G4double mu0 = 336.1; |
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| 134 | G4double mu1 = 0.48; |
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| 135 | G4double nu0 = 524.3; |
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| 136 | G4double nu1 = -371.8; |
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| 137 | G4double nu2 = -5.924; |
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| 138 | G4double delta=1.2; |
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| 139 | |
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| 140 | Ec = 1.44*theZ*ResidualZ/(1.5*ResidualAthrd+delta); |
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| 141 | p = p0 + p1/Ec + p2/(Ec*Ec); |
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| 142 | landa = landa0*ResidualA + landa1; |
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[1340] | 143 | G4double resmu1 = g4pow->powZ(ResidualA,mu1); |
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| 144 | mu = mu0*resmu1; |
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| 145 | nu = resmu1*(nu0 + nu1*Ec + nu2*(Ec*Ec)); |
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[968] | 146 | q = landa - nu/(Ec*Ec) - 2*p*Ec; |
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| 147 | r = mu + 2*nu/Ec + p*(Ec*Ec); |
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| 148 | |
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| 149 | ji=std::max(Kc,Ec); |
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| 150 | if(Kc < Ec) { xs = p*Kc*Kc + q*Kc + r;} |
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| 151 | else {xs = p*(Kc - ji)*(Kc - ji) + landa*Kc + mu + nu*(2 - Kc/ji)/ji ;} |
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| 152 | |
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| 153 | if (xs <0.0) {xs=0.0;} |
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| 154 | |
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| 155 | return xs; |
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| 156 | } |
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| 157 | |
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| 158 | // *********** OPT=3,4 : Kalbach's cross sections (from PRECO code)************* |
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[1340] | 159 | G4double G4PreCompoundDeuteron::GetOpt34(G4double K) |
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[968] | 160 | // ** d from o.m. of perey and perey |
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| 161 | { |
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| 162 | |
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| 163 | G4double landa, mu, nu, p ,signor(1.),sig; |
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| 164 | G4double ec,ecsq,xnulam,etest(0.),a; |
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| 165 | G4double b,ecut,cut,ecut2,geom,elab; |
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| 166 | |
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| 167 | G4double flow = 1.e-18; |
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| 168 | G4double spill= 1.e+18; |
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| 169 | |
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| 170 | G4double p0 = 0.798; |
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| 171 | G4double p1 = 420.3; |
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| 172 | G4double p2 = -1651.; |
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| 173 | G4double landa0 = 0.00619; |
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| 174 | G4double landa1 = -7.54; |
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| 175 | G4double mu0 = 583.5; |
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| 176 | G4double mu1 = 0.337; |
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| 177 | G4double nu0 = 421.8; |
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| 178 | G4double nu1 = -474.5; |
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| 179 | G4double nu2 = -3.592; |
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| 180 | |
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| 181 | G4double ra=0.80; |
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| 182 | |
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[1055] | 183 | //JMQ 13/02/09 increase of reduced radius to lower the barrier |
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| 184 | // ec = 1.44 * theZ * ResidualZ / (1.5*ResidualAthrd+ra); |
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| 185 | ec = 1.44 * theZ * ResidualZ / (1.7*ResidualAthrd+ra); |
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[968] | 186 | ecsq = ec * ec; |
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| 187 | p = p0 + p1/ec + p2/ecsq; |
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| 188 | landa = landa0*ResidualA + landa1; |
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[1340] | 189 | a = g4pow->powZ(ResidualA,mu1); |
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[968] | 190 | mu = mu0 * a; |
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| 191 | nu = a* (nu0+nu1*ec+nu2*ecsq); |
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| 192 | xnulam = nu / landa; |
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[1340] | 193 | if (xnulam > spill) { xnulam=0.; } |
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| 194 | if (xnulam >= flow) { etest = 1.2 *std::sqrt(xnulam); } |
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[968] | 195 | |
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| 196 | a = -2.*p*ec + landa - nu/ecsq; |
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| 197 | b = p*ecsq + mu + 2.*nu/ec; |
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| 198 | ecut = 0.; |
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| 199 | cut = a*a - 4.*p*b; |
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[1340] | 200 | if (cut > 0.) { ecut = std::sqrt(cut); } |
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[968] | 201 | ecut = (ecut-a) / (p+p); |
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| 202 | ecut2 = ecut; |
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[1340] | 203 | //JMQ 290310 for avoiding unphysical increase below minimum (at ecut) |
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| 204 | //ecut<0 means that there is no cut with energy axis, i.e. xs is set |
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| 205 | //to 0 bellow minimum |
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| 206 | // if (cut < 0.) ecut2 = ecut - 2.; |
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| 207 | if (cut < 0.) { ecut2 = ecut; } |
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| 208 | elab = K * FragmentA / G4double(ResidualA); |
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[968] | 209 | sig = 0.; |
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[1055] | 210 | |
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[968] | 211 | if (elab <= ec) { //start for E<Ec |
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[1340] | 212 | if (elab > ecut2) { sig = (p*elab*elab+a*elab+b) * signor; } |
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[968] | 213 | } //end for E<Ec |
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| 214 | else { //start for E>Ec |
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| 215 | sig = (landa*elab+mu+nu/elab) * signor; |
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| 216 | geom = 0.; |
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[1340] | 217 | if (xnulam < flow || elab < etest) { return sig; } |
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[968] | 218 | geom = std::sqrt(theA*K); |
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| 219 | geom = 1.23*ResidualAthrd + ra + 4.573/geom; |
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| 220 | geom = 31.416 * geom * geom; |
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| 221 | sig = std::max(geom,sig); |
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| 222 | } //end for E>Ec |
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| 223 | return sig; |
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| 224 | } |
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