00001 // 00002 // ******************************************************************** 00003 // * License and Disclaimer * 00004 // * * 00005 // * The Geant4 software is copyright of the Copyright Holders of * 00006 // * the Geant4 Collaboration. It is provided under the terms and * 00007 // * conditions of the Geant4 Software License, included in the file * 00008 // * LICENSE and available at http://cern.ch/geant4/license . These * 00009 // * include a list of copyright holders. * 00010 // * * 00011 // * Neither the authors of this software system, nor their employing * 00012 // * institutes,nor the agencies providing financial support for this * 00013 // * work make any representation or warranty, express or implied, * 00014 // * regarding this software system or assume any liability for its * 00015 // * use. Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // 00027 // ------------------------------------------------------------------- 00028 // GEANT4 Class file 00029 // 00030 // For information related to this code contact: 00031 // 00032 // File name: G4XAqmElastic 00033 // 00034 // Author: 00035 // 00036 // Creation date: 15 April 1999 00037 // 00038 // Modifications: 00039 // 00040 // Additive Quark Model Elastic cross section 00041 // (H.J. Lipkin and F. Scheck, Phys.Rev. 16 (1966) 71 00042 // 00043 // ------------------------------------------------------------------- 00044 00045 #include "globals.hh" 00046 #include "G4ios.hh" 00047 #include "G4XAqmElastic.hh" 00048 #include "G4XAqmTotal.hh" 00049 #include "G4KineticTrack.hh" 00050 #include "G4ParticleDefinition.hh" 00051 00052 00053 // Validity range of this cross-section 00054 const G4double G4XAqmElastic::_lowLimit = 0.; 00055 const G4double G4XAqmElastic::_highLimit = DBL_MAX; 00056 00057 G4XAqmElastic::G4XAqmElastic() 00058 { 00059 // As a first approximation the model is assumed to be valid over 00060 // the entire energy range 00061 } 00062 00063 00064 G4XAqmElastic::~G4XAqmElastic() 00065 { } 00066 00067 00068 G4bool G4XAqmElastic::operator==(const G4XAqmElastic &right) const 00069 { 00070 return (this == (G4XAqmElastic *) &right); 00071 } 00072 00073 00074 G4bool G4XAqmElastic::operator!=(const G4XAqmElastic &right) const 00075 { 00076 return (this != (G4XAqmElastic *) &right); 00077 } 00078 00079 00080 G4double G4XAqmElastic::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const 00081 { 00082 G4double sigma = 0.; 00083 00084 // Reference to be checked!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 00085 const G4double coeff = 0.39; 00086 const G4double param = 1.5; 00087 00088 G4XAqmTotal aqmTotal; 00089 00090 G4double sigmaTot = aqmTotal.CrossSection(trk1,trk2); 00091 sigma = coeff * std::pow(sigmaTot,param); 00092 00093 // Verify that elastic cross section < total cross section 00094 00095 if (sigma > sigmaTot) 00096 throw G4HadronicException(__FILE__, __LINE__, "G4XAqmElastic::CrossSection - elastic cross section greater than total"); 00097 00098 return sigma; 00099 } 00100 00101 00102 G4String G4XAqmElastic::Name() const 00103 { 00104 G4String name("AqmElasticCrossSection"); 00105 return name; 00106 } 00107 00108 00109 G4bool G4XAqmElastic::IsValid(G4double e) const 00110 { 00111 G4bool answer = InLimits(e,_lowLimit,_highLimit); 00112 00113 return answer; 00114 }