[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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[1055] | 26 | // $Id: G4InelasticInteraction.cc,v 1.12 2009/01/24 11:56:27 vnivanch Exp $ |
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[1196] | 27 | // GEANT4 tag $Name: geant4-09-03-cand-01 $ |
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[819] | 28 | // |
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[1055] | 29 | // Hadronic Process: Inelastic Interaction |
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| 30 | // original by H.P. Wellisch |
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| 31 | // modified by J.L. Chuma, TRIUMF, 22-Nov-1996 |
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| 32 | // Last modified: 27-Mar-1997 |
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| 33 | // J.P. Wellisch: 23-Apr-97: throw G4HadronicException(__FILE__, __LINE__, removed |
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| 34 | // J.P. Wellisch: 24-Apr-97: correction for SetUpPions |
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| 35 | // Modified by J.L. Chuma, 30-Apr-97: added originalTarget to CalculateMomenta |
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| 36 | // since TwoBody needed to reset the target particle |
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| 37 | // J.L. Chuma, 20-Jun-97: Modified CalculateMomenta to correct the decision process |
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| 38 | // for whether to use GenerateXandPt or TwoCluster |
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| 39 | // J.L. Chuma, 06-Aug-97: added original incident particle, before Fermi motion and |
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| 40 | // evaporation effects are included, needed for calculating |
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| 41 | // self absorption and corrections for single particle spectra |
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| 42 | // HPW removed misunderstanding of LocalEnergyDeposit, 11.04.98. |
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| 43 | // 23-Jan-2009 V.Ivanchenko move constructor and destructor to the body |
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[819] | 44 | |
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| 45 | #include "G4InelasticInteraction.hh" |
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| 46 | #include "Randomize.hh" |
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| 47 | #include "G4HadReentrentException.hh" |
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[1055] | 48 | |
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| 49 | G4InelasticInteraction::G4InelasticInteraction(const G4String& modelName) |
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| 50 | : G4HadronicInteraction(modelName) |
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| 51 | { cache = 0.0;} |
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| 52 | |
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| 53 | G4InelasticInteraction::~G4InelasticInteraction() |
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| 54 | {} |
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[819] | 55 | |
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[1055] | 56 | G4double |
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[819] | 57 | G4InelasticInteraction::Pmltpc( // used in Cascade functions |
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| 58 | G4int np, G4int nm, G4int nz, G4int n, G4double b, G4double c ) |
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| 59 | { |
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| 60 | const G4double expxu = 82.; // upper bound for arg. of exp |
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| 61 | const G4double expxl = -expxu; // lower bound for arg. of exp |
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| 62 | G4double npf = 0.0; |
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| 63 | G4double nmf = 0.0; |
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| 64 | G4double nzf = 0.0; |
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| 65 | G4int i; |
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| 66 | for( i=2; i<=np; i++ )npf += std::log((double)i); |
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| 67 | for( i=2; i<=nm; i++ )nmf += std::log((double)i); |
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| 68 | for( i=2; i<=nz; i++ )nzf += std::log((double)i); |
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| 69 | G4double r; |
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| 70 | r = std::min( expxu, std::max( expxl, -(np-nm+nz+b)*(np-nm+nz+b)/(2*c*c*n*n)-npf-nmf-nzf ) ); |
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| 71 | return std::exp(r); |
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| 72 | } |
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| 73 | |
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[1055] | 74 | G4bool |
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[819] | 75 | G4InelasticInteraction::MarkLeadingStrangeParticle( |
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| 76 | const G4ReactionProduct ¤tParticle, |
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| 77 | const G4ReactionProduct &targetParticle, |
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| 78 | G4ReactionProduct &leadParticle ) |
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| 79 | { |
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| 80 | // the following was in GenerateXandPt and TwoCluster |
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| 81 | // add a parameter to the GenerateXandPt function telling it about the strange particle |
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| 82 | // |
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| 83 | // assumes that the original particle was a strange particle |
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| 84 | // |
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| 85 | G4bool lead = false; |
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| 86 | if( (currentParticle.GetMass() >= G4KaonPlus::KaonPlus()->GetPDGMass()) && |
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| 87 | (currentParticle.GetDefinition() != G4Proton::Proton()) && |
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| 88 | (currentParticle.GetDefinition() != G4Neutron::Neutron()) ) |
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| 89 | { |
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| 90 | lead = true; |
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| 91 | leadParticle = currentParticle; // set lead to the incident particle |
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| 92 | } |
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| 93 | else if( (targetParticle.GetMass() >= G4KaonPlus::KaonPlus()->GetPDGMass()) && |
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| 94 | (targetParticle.GetDefinition() != G4Proton::Proton()) && |
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| 95 | (targetParticle.GetDefinition() != G4Neutron::Neutron()) ) |
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| 96 | { |
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| 97 | lead = true; |
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| 98 | leadParticle = targetParticle; // set lead to the target particle |
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| 99 | } |
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| 100 | return lead; |
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| 101 | } |
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| 102 | |
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[1055] | 103 | void |
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[819] | 104 | G4InelasticInteraction::SetUpPions( |
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| 105 | const G4int np, |
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| 106 | const G4int nm, |
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| 107 | const G4int nz, |
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| 108 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
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| 109 | G4int &vecLen ) |
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| 110 | { |
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| 111 | if( np+nm+nz == 0 )return; |
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| 112 | G4int i; |
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| 113 | G4ReactionProduct *p; |
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| 114 | for( i=0; i<np; ++i ) |
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| 115 | { |
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| 116 | p = new G4ReactionProduct; |
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| 117 | p->SetDefinition( G4PionPlus::PionPlus() ); |
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| 118 | (G4UniformRand() < 0.5) ? p->SetSide( -1 ) : p->SetSide( 1 ); |
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| 119 | vec.SetElement( vecLen++, p ); |
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| 120 | } |
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| 121 | for( i=np; i<np+nm; ++i ) |
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| 122 | { |
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| 123 | p = new G4ReactionProduct; |
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| 124 | p->SetDefinition( G4PionMinus::PionMinus() ); |
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| 125 | (G4UniformRand() < 0.5) ? p->SetSide( -1 ) : p->SetSide( 1 ); |
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| 126 | vec.SetElement( vecLen++, p ); |
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| 127 | } |
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| 128 | for( i=np+nm; i<np+nm+nz; ++i ) |
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| 129 | { |
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| 130 | p = new G4ReactionProduct; |
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| 131 | p->SetDefinition( G4PionZero::PionZero() ); |
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| 132 | (G4UniformRand() < 0.5) ? p->SetSide( -1 ) : p->SetSide( 1 ); |
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| 133 | vec.SetElement( vecLen++, p ); |
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| 134 | } |
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| 135 | } |
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| 136 | |
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[1055] | 137 | void |
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[819] | 138 | G4InelasticInteraction::GetNormalizationConstant( |
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| 139 | const G4double energy, // MeV, <0 means annihilation channels |
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| 140 | G4double &n, |
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| 141 | G4double &anpn ) |
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| 142 | { |
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| 143 | const G4double expxu = 82.; // upper bound for arg. of exp |
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| 144 | const G4double expxl = -expxu; // lower bound for arg. of exp |
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| 145 | const G4int numSec = 60; |
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| 146 | // |
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| 147 | // the only difference between the calculation for annihilation channels |
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| 148 | // and normal is the starting value, iBegin, for the loop below |
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| 149 | // |
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| 150 | G4int iBegin = 1; |
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| 151 | G4double en = energy; |
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| 152 | if( energy < 0.0 ) |
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| 153 | { |
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| 154 | iBegin = 2; |
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| 155 | en *= -1.0; |
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| 156 | } |
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| 157 | // |
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| 158 | // number of total particles vs. centre of mass Energy - 2*proton mass |
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| 159 | // |
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| 160 | G4double aleab = std::log(en/GeV); |
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| 161 | n = 3.62567 + aleab*(0.665843 + aleab*(0.336514 + aleab*(0.117712 + 0.0136912*aleab))); |
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| 162 | n -= 2.0; |
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| 163 | // |
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| 164 | // normalization constant for kno-distribution |
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| 165 | // |
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| 166 | anpn = 0.0; |
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| 167 | G4double test, temp; |
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| 168 | for( G4int i=iBegin; i<=numSec; ++i ) |
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| 169 | { |
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| 170 | temp = pi*i/(2.0*n*n); |
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| 171 | test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(i*i)/(n*n) ) ) ); |
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| 172 | if( temp < 1.0 ) |
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| 173 | { |
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| 174 | if( test >= 1.0e-10 )anpn += temp*test; |
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| 175 | } |
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| 176 | else |
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| 177 | anpn += temp*test; |
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| 178 | } |
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| 179 | } |
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| 180 | |
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[1055] | 181 | void |
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[819] | 182 | G4InelasticInteraction::CalculateMomenta( |
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| 183 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
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| 184 | G4int &vecLen, |
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| 185 | const G4HadProjectile *originalIncident, // the original incident particle |
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| 186 | const G4DynamicParticle *originalTarget, |
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| 187 | G4ReactionProduct &modifiedOriginal, // Fermi motion and evap. effects included |
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| 188 | G4Nucleus &targetNucleus, |
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| 189 | G4ReactionProduct ¤tParticle, |
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| 190 | G4ReactionProduct &targetParticle, |
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| 191 | G4bool &incidentHasChanged, |
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| 192 | G4bool &targetHasChanged, |
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| 193 | G4bool quasiElastic ) |
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| 194 | { |
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| 195 | cache = 0; |
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| 196 | what = originalIncident->Get4Momentum().vect(); |
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| 197 | |
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| 198 | |
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| 199 | theReactionDynamics.ProduceStrangeParticlePairs( vec, vecLen, |
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| 200 | modifiedOriginal, originalTarget, |
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| 201 | currentParticle, targetParticle, |
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| 202 | incidentHasChanged, targetHasChanged ); |
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| 203 | |
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| 204 | if( quasiElastic ) |
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| 205 | { |
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| 206 | theReactionDynamics.TwoBody( vec, vecLen, |
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| 207 | modifiedOriginal, originalTarget, |
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| 208 | currentParticle, targetParticle, |
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| 209 | targetNucleus, targetHasChanged ); |
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| 210 | return; |
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| 211 | } |
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| 212 | G4ReactionProduct leadingStrangeParticle; |
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| 213 | G4bool leadFlag = MarkLeadingStrangeParticle( currentParticle, |
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| 214 | targetParticle, |
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| 215 | leadingStrangeParticle ); |
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| 216 | // |
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| 217 | // Note: the number of secondaries can be reduced in GenerateXandPt and TwoCluster |
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| 218 | // |
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| 219 | G4bool finishedGenXPt = false; |
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| 220 | G4bool annihilation = false; |
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| 221 | if( originalIncident->GetDefinition()->GetPDGEncoding() < 0 && |
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| 222 | currentParticle.GetMass() == 0.0 && targetParticle.GetMass() == 0.0 ) |
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| 223 | { |
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| 224 | // original was an anti-particle and annihilation has taken place |
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| 225 | annihilation = true; |
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| 226 | G4double ekcor = 1.0; |
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| 227 | G4double ek = originalIncident->GetKineticEnergy(); |
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| 228 | G4double ekOrg = ek; |
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| 229 | |
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| 230 | const G4double tarmas = originalTarget->GetDefinition()->GetPDGMass(); |
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| 231 | if( ek > 1.0*GeV )ekcor = 1./(ek/GeV); |
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| 232 | const G4double atomicWeight = targetNucleus.GetN(); |
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| 233 | ek = 2*tarmas + ek*(1.+ekcor/atomicWeight); |
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| 234 | G4double tkin = targetNucleus.Cinema(ek); |
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| 235 | ek += tkin; |
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| 236 | ekOrg += tkin; |
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| 237 | // modifiedOriginal.SetKineticEnergy( ekOrg ); |
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| 238 | // |
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| 239 | // evaporation -- re-calculate black track energies |
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| 240 | // this was Done already just before the cascade |
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| 241 | // |
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| 242 | tkin = targetNucleus.AnnihilationEvaporationEffects(ek, ekOrg); |
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| 243 | ekOrg -= tkin; |
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| 244 | ekOrg = std::max( 0.0001*GeV, ekOrg ); |
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| 245 | modifiedOriginal.SetKineticEnergy( ekOrg ); |
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| 246 | G4double amas = originalIncident->GetDefinition()->GetPDGMass(); |
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| 247 | G4double et = ekOrg + amas; |
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| 248 | G4double p = std::sqrt( std::abs(et*et-amas*amas) ); |
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| 249 | G4double pp = modifiedOriginal.GetMomentum().mag(); |
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| 250 | if( pp > 0.0 ) |
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| 251 | { |
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| 252 | G4ThreeVector momentum = modifiedOriginal.GetMomentum(); |
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| 253 | modifiedOriginal.SetMomentum( momentum * (p/pp) ); |
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| 254 | } |
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| 255 | if( ekOrg <= 0.0001 ) |
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| 256 | { |
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| 257 | modifiedOriginal.SetKineticEnergy( 0.0 ); |
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| 258 | modifiedOriginal.SetMomentum( 0.0, 0.0, 0.0 ); |
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| 259 | } |
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| 260 | } |
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| 261 | const G4double twsup[] = { 1.0, 0.7, 0.5, 0.3, 0.2, 0.1 }; |
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| 262 | G4double rand1 = G4UniformRand(); |
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| 263 | G4double rand2 = G4UniformRand(); |
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| 264 | |
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| 265 | // Cache current, target, and secondaries |
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| 266 | G4ReactionProduct saveCurrent = currentParticle; |
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| 267 | G4ReactionProduct saveTarget = targetParticle; |
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| 268 | std::vector<G4ReactionProduct> savevec; |
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| 269 | for (G4int i = 0; i < vecLen; i++) savevec.push_back(*vec[i]); |
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| 270 | |
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| 271 | if (annihilation || |
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| 272 | vecLen >= 6 || |
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| 273 | ( modifiedOriginal.GetKineticEnergy()/GeV >= 1.0 && |
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| 274 | ( ( (originalIncident->GetDefinition() == G4KaonPlus::KaonPlus() || |
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| 275 | originalIncident->GetDefinition() == G4KaonMinus::KaonMinus() || |
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| 276 | originalIncident->GetDefinition() == G4KaonZeroLong::KaonZeroLong() || |
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| 277 | originalIncident->GetDefinition() == G4KaonZeroShort::KaonZeroShort() ) |
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| 278 | && |
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| 279 | rand1 < 0.5 ) |
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| 280 | || rand2 > twsup[vecLen] ) ) ) |
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| 281 | |
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| 282 | finishedGenXPt = |
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| 283 | theReactionDynamics.GenerateXandPt( vec, vecLen, |
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| 284 | modifiedOriginal, originalIncident, |
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| 285 | currentParticle, targetParticle, |
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| 286 | originalTarget, |
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| 287 | targetNucleus, incidentHasChanged, |
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| 288 | targetHasChanged, leadFlag, |
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| 289 | leadingStrangeParticle ); |
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| 290 | if( finishedGenXPt ) |
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| 291 | { |
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| 292 | Rotate(vec, vecLen); |
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| 293 | return; |
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| 294 | } |
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| 295 | |
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| 296 | G4bool finishedTwoClu = false; |
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| 297 | if( modifiedOriginal.GetTotalMomentum()/MeV < 1.0 ) |
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| 298 | { |
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| 299 | for(G4int i=0; i<vecLen; i++) delete vec[i]; |
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| 300 | vecLen = 0; |
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| 301 | } |
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| 302 | else |
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| 303 | { |
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| 304 | // Occaisionally, GenerateXandPt will fail in the annihilation channel. |
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| 305 | // Restore current, target and secondaries to pre-GenerateXandPt state |
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| 306 | // before trying annihilation in TwoCluster |
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| 307 | |
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| 308 | if (!finishedGenXPt && annihilation) { |
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| 309 | currentParticle = saveCurrent; |
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| 310 | targetParticle = saveTarget; |
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| 311 | for (G4int i = 0; i < vecLen; i++) delete vec[i]; |
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| 312 | vecLen = 0; |
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| 313 | vec.Initialize( 0 ); |
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| 314 | for (G4int i = 0; i < G4int(savevec.size()); i++) { |
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| 315 | G4ReactionProduct* p = new G4ReactionProduct; |
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| 316 | *p = savevec[i]; |
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| 317 | vec.SetElement( vecLen++, p ); |
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| 318 | } |
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| 319 | } |
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| 320 | |
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| 321 | theReactionDynamics.SuppressChargedPions( vec, vecLen, |
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| 322 | modifiedOriginal, currentParticle, |
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| 323 | targetParticle, targetNucleus, |
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| 324 | incidentHasChanged, targetHasChanged ); |
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| 325 | try |
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| 326 | { |
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| 327 | finishedTwoClu = theReactionDynamics.TwoCluster( vec, vecLen, |
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| 328 | modifiedOriginal, originalIncident, |
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| 329 | currentParticle, targetParticle, |
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| 330 | originalTarget, |
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| 331 | targetNucleus, incidentHasChanged, |
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| 332 | targetHasChanged, leadFlag, |
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| 333 | leadingStrangeParticle ); |
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| 334 | } |
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| 335 | catch(G4HadReentrentException aC) |
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| 336 | { |
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| 337 | aC.Report(G4cout); |
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| 338 | throw G4HadReentrentException(__FILE__, __LINE__, "Failing to calculate momenta"); |
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| 339 | } |
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| 340 | } |
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| 341 | |
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| 342 | if( finishedTwoClu ) |
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| 343 | { |
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| 344 | Rotate(vec, vecLen); |
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| 345 | return; |
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| 346 | } |
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| 347 | |
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| 348 | theReactionDynamics.TwoBody( vec, vecLen, |
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| 349 | modifiedOriginal, originalTarget, |
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| 350 | currentParticle, targetParticle, |
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| 351 | targetNucleus, targetHasChanged ); |
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| 352 | } |
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| 353 | |
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| 354 | |
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[1055] | 355 | void G4InelasticInteraction:: |
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[819] | 356 | Rotate(G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, G4int &vecLen) |
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| 357 | { |
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| 358 | G4double rotation = 2.*pi*G4UniformRand(); |
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| 359 | cache = rotation; |
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| 360 | G4int i; |
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| 361 | for( i=0; i<vecLen; ++i ) |
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| 362 | { |
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| 363 | G4ThreeVector momentum = vec[i]->GetMomentum(); |
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| 364 | momentum = momentum.rotate(rotation, what); |
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| 365 | vec[i]->SetMomentum(momentum); |
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| 366 | } |
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| 367 | } |
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| 368 | |
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[1055] | 369 | void |
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[819] | 370 | G4InelasticInteraction::SetUpChange( |
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| 371 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
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| 372 | G4int &vecLen, |
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| 373 | G4ReactionProduct ¤tParticle, |
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| 374 | G4ReactionProduct &targetParticle, |
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| 375 | G4bool &incidentHasChanged ) |
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| 376 | { |
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| 377 | theParticleChange.Clear(); |
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| 378 | G4ParticleDefinition *aKaonZL = G4KaonZeroLong::KaonZeroLong(); |
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| 379 | G4ParticleDefinition *aKaonZS = G4KaonZeroShort::KaonZeroShort(); |
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| 380 | G4int i; |
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| 381 | if( currentParticle.GetDefinition() == aKaonZL ) |
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| 382 | { |
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| 383 | if( G4UniformRand() <= 0.5 ) |
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| 384 | { |
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| 385 | currentParticle.SetDefinition( aKaonZS ); |
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| 386 | incidentHasChanged = true; |
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| 387 | } |
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| 388 | } |
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| 389 | else if( currentParticle.GetDefinition() == aKaonZS ) |
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| 390 | { |
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| 391 | if( G4UniformRand() > 0.5 ) |
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| 392 | { |
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| 393 | currentParticle.SetDefinition( aKaonZL ); |
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| 394 | incidentHasChanged = true; |
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| 395 | } |
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| 396 | } |
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| 397 | if( targetParticle.GetDefinition() == aKaonZL ) |
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| 398 | { |
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| 399 | if( G4UniformRand() <= 0.5 )targetParticle.SetDefinition( aKaonZS ); |
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| 400 | } |
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| 401 | else if( targetParticle.GetDefinition() == aKaonZS ) |
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| 402 | { |
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| 403 | if( G4UniformRand() > 0.5 )targetParticle.SetDefinition( aKaonZL ); |
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| 404 | } |
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| 405 | for( i=0; i<vecLen; ++i ) |
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| 406 | { |
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| 407 | if( vec[i]->GetDefinition() == aKaonZL ) |
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| 408 | { |
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| 409 | if( G4UniformRand() <= 0.5 )vec[i]->SetDefinition( aKaonZS ); |
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| 410 | } |
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| 411 | else if( vec[i]->GetDefinition() == aKaonZS ) |
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| 412 | { |
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| 413 | if( G4UniformRand() > 0.5 )vec[i]->SetDefinition( aKaonZL ); |
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| 414 | } |
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| 415 | } |
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| 416 | if( incidentHasChanged ) |
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| 417 | { |
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| 418 | G4DynamicParticle* p0 = new G4DynamicParticle; |
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| 419 | p0->SetDefinition( currentParticle.GetDefinition() ); |
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| 420 | p0->SetMomentum( currentParticle.GetMomentum() ); |
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| 421 | theParticleChange.AddSecondary( p0 ); |
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| 422 | theParticleChange.SetStatusChange( stopAndKill ); |
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| 423 | theParticleChange.SetEnergyChange( 0.0 ); |
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| 424 | } |
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| 425 | else |
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| 426 | { |
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| 427 | G4double p = currentParticle.GetMomentum().mag()/MeV; |
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| 428 | G4ThreeVector m = currentParticle.GetMomentum(); |
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| 429 | if( p > DBL_MIN ) |
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| 430 | theParticleChange.SetMomentumChange( m.x()/p, m.y()/p, m.z()/p ); |
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| 431 | else |
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| 432 | theParticleChange.SetMomentumChange( 1.0, 0.0, 0.0 ); |
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| 433 | |
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| 434 | G4double aE = currentParticle.GetKineticEnergy(); |
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| 435 | if (std::fabs(aE)<.1*eV) aE=.1*eV; |
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| 436 | theParticleChange.SetEnergyChange( aE ); |
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| 437 | } |
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| 438 | |
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| 439 | if( targetParticle.GetMass() > 0.0 ) // targetParticle can be eliminated in TwoBody |
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| 440 | { |
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| 441 | G4DynamicParticle *p1 = new G4DynamicParticle; |
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| 442 | p1->SetDefinition( targetParticle.GetDefinition() ); |
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| 443 | G4ThreeVector momentum = targetParticle.GetMomentum(); |
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| 444 | momentum = momentum.rotate(cache, what); |
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| 445 | p1->SetMomentum( momentum ); |
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| 446 | theParticleChange.AddSecondary( p1 ); |
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| 447 | } |
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| 448 | |
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| 449 | G4DynamicParticle *p; |
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| 450 | for( i=0; i<vecLen; ++i ) |
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| 451 | { |
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| 452 | p = new G4DynamicParticle(); |
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| 453 | p->SetDefinition( vec[i]->GetDefinition() ); |
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| 454 | p->SetMomentum( vec[i]->GetMomentum() ); |
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| 455 | theParticleChange.AddSecondary( p ); |
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| 456 | delete vec[i]; |
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| 457 | } |
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| 458 | } |
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| 459 | |
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| 460 | /* end of file */ |
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| 461 | |
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