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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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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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 | // ------------------------------------------------------------------- |
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28 | // GEANT4 Class file |
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29 | // |
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30 | // For information related to this code contact: |
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31 | // |
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32 | // File name: G4XAqmElastic |
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33 | // |
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34 | // Author: |
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35 | // |
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36 | // Creation date: 15 April 1999 |
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37 | // |
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38 | // Modifications: |
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39 | // |
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40 | // Additive Quark Model Elastic cross section |
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41 | // (H.J. Lipkin and F. Scheck, Phys.Rev. 16 (1966) 71 |
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42 | // |
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43 | // ------------------------------------------------------------------- |
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44 | |
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45 | #include "globals.hh" |
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46 | #include "G4ios.hh" |
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47 | #include "G4XAqmElastic.hh" |
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48 | #include "G4XAqmTotal.hh" |
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49 | #include "G4KineticTrack.hh" |
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50 | #include "G4ParticleDefinition.hh" |
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51 | |
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52 | |
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53 | // Validity range of this cross-section |
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54 | const G4double G4XAqmElastic::_lowLimit = 0.; |
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55 | const G4double G4XAqmElastic::_highLimit = DBL_MAX; |
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56 | |
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57 | G4XAqmElastic::G4XAqmElastic() |
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58 | { |
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59 | // As a first approximation the model is assumed to be valid over |
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60 | // the entire energy range |
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61 | } |
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62 | |
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63 | |
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64 | G4XAqmElastic::~G4XAqmElastic() |
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65 | { } |
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66 | |
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67 | |
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68 | G4bool G4XAqmElastic::operator==(const G4XAqmElastic &right) const |
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69 | { |
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70 | return (this == (G4XAqmElastic *) &right); |
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71 | } |
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72 | |
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73 | |
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74 | G4bool G4XAqmElastic::operator!=(const G4XAqmElastic &right) const |
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75 | { |
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76 | return (this != (G4XAqmElastic *) &right); |
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77 | } |
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78 | |
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79 | |
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80 | G4double G4XAqmElastic::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const |
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81 | { |
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82 | G4double sigma = 0.; |
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83 | |
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84 | // Reference to be checked!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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85 | const G4double coeff = 0.39; |
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86 | const G4double param = 1.5; |
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87 | |
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88 | G4XAqmTotal aqmTotal; |
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89 | |
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90 | G4double sigmaTot = aqmTotal.CrossSection(trk1,trk2); |
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91 | sigma = coeff * std::pow(sigmaTot,param); |
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92 | |
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93 | // Verify that elastic cross section < total cross section |
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94 | |
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95 | if (sigma > sigmaTot) |
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96 | throw G4HadronicException(__FILE__, __LINE__, "G4XAqmElastic::CrossSection - elastic cross section greater than total"); |
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97 | |
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98 | return sigma; |
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99 | } |
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100 | |
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101 | |
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102 | G4String G4XAqmElastic::Name() const |
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103 | { |
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104 | G4String name("AqmElasticCrossSection"); |
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105 | return name; |
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106 | } |
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107 | |
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108 | |
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109 | G4bool G4XAqmElastic::IsValid(G4double e) const |
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110 | { |
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111 | G4bool answer = InLimits(e,_lowLimit,_highLimit); |
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112 | |
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113 | return answer; |
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114 | } |
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