| [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: G4CrossSectionChargeTransferCH.cc,v 1.3 2008/03/25 16:00:20 pia Exp $
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| [991] | 28 | // GEANT4 tag $Name: geant4-09-02 $
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| [968] | 29 | //
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| 30 | // Contact Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
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| 31 | //
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| 32 | // Reference: TNS Geant4-DNA paper
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| 33 | // Reference for implementation model: NIM. 155, pp. 145-156, 1978
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| 34 |
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| 35 | // History:
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| 36 | // -----------
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| 37 | // Date Name Modification
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| 38 | // 28 Dec 2007 M.G. Pia Created
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| 39 | //
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| 40 | // -------------------------------------------------------------------
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| 41 |
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| 42 | // Class description:
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| 43 | // Total cross section for incident p charge transfer in hydrocarbons
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| 44 | // Reference: K. Janev, J. G. Wang and T. Kato, NIFS-DATA (2001)
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| 45 | // http://www-cfadc.phy.ornl.gov/astro/ps/data/
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| 46 | // http://www-pub.iaea.org/MTCD/publications/PDF/APID-VOL10.pdf
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| 47 | //
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| 48 | // The fit formula is:
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| 49 | // ln(cross section)=\sum C_i T_i(x)
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| 50 | // x=[2ln(E)-ln(E_min)-ln(E_max)]/[ln(E_max)-ln(E_min)]
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| 51 | // T_1(x)=1
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| 52 | // T_2(x)=x
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| 53 | // T_n+2(x)=2T_n+1(x)-T_n(x)
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| 54 | //
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| 55 | // Where cross section is given in 10^-16 cm2 and E is in keV,
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| 56 | // E_min=1e-4 keV and E_max=1.e3 keV.
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| 57 |
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| 58 | // Further documentation available from http://www.ge.infn.it/geant4/
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| 59 |
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| 60 | // -------------------------------------------------------------------
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| 61 |
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| 62 |
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| 63 | #include "G4CrossSectionChargeTransferCH.hh"
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| 64 | #include "G4Track.hh"
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| 65 | #include "G4DynamicParticle.hh"
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| 66 | #include "G4Proton.hh"
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| 67 |
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| 68 | G4CrossSectionChargeTransferCH::G4CrossSectionChargeTransferCH()
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| 69 | {
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| 70 | // Default energy limits (defined for protection against anomalous behaviour only)
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| 71 | name = "ChargeTransferCH";
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| 72 | lowEnergyLimit = 0.1 * eV;
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| 73 | highEnergyLimit = 1.0 * MeV;
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| 74 |
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| 75 | std::vector<G4double> coeff;
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| 76 | G4String materialName;
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| 77 |
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| 78 | // CH
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| 79 | materialName = "CH";
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| 80 | coeff.push_back(-1.060468);
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| 81 | coeff.push_back(-5.662572);
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| 82 | coeff.push_back(-4.376450);
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| 83 | coeff.push_back(-3.567226);
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| 84 | coeff.push_back(-1.433069);
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| 85 | coeff.push_back(-0.5789399);
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| 86 | coeff.push_back(-0.3523295);
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| 87 | coeff.push_back(-0.09956988);
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| 88 | coeff.push_back(0.01532751);
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| 89 | crossMap[materialName] = coeff;
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| 90 | coeff.clear();
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| 91 |
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| 92 | // CH2
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| 93 | materialName = "CH2";
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| 94 | coeff.push_back(1.118652E-01);
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| 95 | coeff.push_back(-5.216803E+00);
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| 96 | coeff.push_back(-3.893841E+00);
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| 97 | coeff.push_back(-2.756865E+00);
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| 98 | coeff.push_back(-1.192043E+00);
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| 99 | coeff.push_back(-5.200059E-01);
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| 100 | coeff.push_back(-1.816781E-01);
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| 101 | coeff.push_back(1.129866E-02);
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| 102 | coeff.push_back(-3.658702E-03);
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| 103 | crossMap[materialName] = coeff;
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| 104 | coeff.clear();
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| 105 |
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| 106 | // CH3
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| 107 | coeff.push_back(6.854778E-01);
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| 108 | coeff.push_back(-5.810741E+00);
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| 109 | coeff.push_back(-3.622136E+00);
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| 110 | coeff.push_back(-2.179920E+00);
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| 111 | coeff.push_back(-7.801006E-01);
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| 112 | coeff.push_back(-2.421371E-02);
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| 113 | coeff.push_back(2.762333E-01);
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| 114 | coeff.push_back(2.288237E-01);
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| 115 | coeff.push_back(6.164797E-02);
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| 116 | crossMap[materialName] = coeff;
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| 117 | coeff.clear();
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| 118 |
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| 119 | // CH4
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| 120 | materialName = "CH4";
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| 121 | coeff.push_back(0.3901564);
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| 122 | coeff.push_back(-6.426675);
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| 123 | coeff.push_back(-3.706893);
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| 124 | coeff.push_back(-1.999034);
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| 125 | coeff.push_back(-0.5625439);
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| 126 | coeff.push_back(0.2279431);
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| 127 | coeff.push_back(0.3443980);
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| 128 | coeff.push_back(0.1566892);
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| 129 | coeff.push_back(-0.05398410);
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| 130 | coeff.push_back(-0.1822252);
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| 131 | coeff.push_back(-0.1593352);
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| 132 | coeff.push_back(-0.08826322);
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| 133 | crossMap[materialName] = coeff;
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| 134 | coeff.clear();
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| 135 |
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| 136 | // C2H
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| 137 | materialName = "C2H";
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| 138 | coeff.push_back(-1.986507E+00);
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| 139 | coeff.push_back(-5.720283E+00);
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| 140 | coeff.push_back(-3.535139E+00);
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| 141 | coeff.push_back(-4.230273E+00);
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| 142 | coeff.push_back(-1.254502E+00);
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| 143 | coeff.push_back(-2.056898E-01);
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| 144 | coeff.push_back(-4.595756E-01);
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| 145 | coeff.push_back(-7.842824E-02);
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| 146 | coeff.push_back(3.002537E-02);
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| 147 | coeff.push_back(-5.626713E-02);
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| 148 | coeff.push_back(6.455583E-02);
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| 149 | crossMap[materialName] = coeff;
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| 150 | coeff.clear();
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| 151 |
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| 152 | // C2H2
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| 153 | materialName = "C2H2";
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| 154 | coeff.push_back(2.513870E-01);
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| 155 | coeff.push_back(-5.812705E+00);
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| 156 | coeff.push_back(-3.338185E+00);
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| 157 | coeff.push_back(-3.071630E+00);
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| 158 | coeff.push_back(-1.433263E+00);
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| 159 | coeff.push_back(-3.583544E-01);
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| 160 | coeff.push_back(-1.456216E-01);
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| 161 | coeff.push_back(-7.391778E-03);
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| 162 | coeff.push_back(1.151712E-02);
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| 163 | crossMap[materialName] = coeff;
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| 164 | coeff.clear();
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| 165 | //
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| 166 |
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| 167 | }
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| 168 |
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| 169 |
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| 170 | G4CrossSectionChargeTransferCH::~G4CrossSectionChargeTransferCH()
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| 171 | { }
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| 172 |
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| 173 |
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| 174 | G4double G4CrossSectionChargeTransferCH::CrossSection(const G4Track& track)
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| 175 | {
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| 176 | G4double sigma = DBL_MIN;
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| 177 |
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| 178 | const G4DynamicParticle* particle = track.GetDynamicParticle();
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| 179 | G4double e = particle->GetKineticEnergy() / keV;
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| 180 |
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| 181 | // Get the material the track is in
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| 182 | G4Material* material = track.GetMaterial();
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| 183 | G4String materialName;
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| 184 | materialName = material->GetName();
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| 185 |
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| 186 | // Check whether cross section data are available for the current material
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| 187 |
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| 188 | std::map<G4String,std::vector<G4double>,std::less<G4String> >::const_iterator pos;
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| 189 | pos = crossMap.find(materialName);
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| 190 | if (pos!= crossMap.end())
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| 191 | {
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| 192 | std::vector<G4double> coeff = (*pos).second;
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| 193 | G4double eMin = lowEnergyLimit / keV;
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| 194 | G4double eMax = highEnergyLimit / keV;
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| 195 | G4double scaleFactor = 1.e-16 * cm2;
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| 196 |
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| 197 | if (e >= eMin && e <= eMax)
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| 198 | {
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| 199 | G4double x = (2.*std::log(e) - std::log(eMin) - std::log(eMax)) / (std::log(eMax) - std::log(eMin));
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| 200 |
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| 201 | std::vector<G4double> t;
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| 202 | t.push_back(1.);
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| 203 | t.push_back(x);
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| 204 | G4double cross = t[0] * coeff[0] + t[1] * coeff[1];
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| 205 |
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| 206 | G4int nCoeff = coeff.size();
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| 207 | for (G4int i=2; i<nCoeff; i++)
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| 208 | {
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| 209 | G4double tNext = 2. * t[i-1] - t[i-2];
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| 210 | t.push_back(tNext);
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| 211 | cross = cross + coeff[i] * tNext;
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| 212 | }
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| 213 | sigma = std::exp(cross) * scaleFactor;
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| 214 | }
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| 215 | }
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| 216 |
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| 217 | return sigma;
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| 218 | }
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| 219 |
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