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 #include "G4GammaAnnCrossSection.hh" 00027 #include "G4Gamma.hh" 00028 00029 G4GammaAnnCrossSection:: 00030 G4GammaAnnCrossSection() 00031 { 00032 // pho0 Nucleon 00033 theGammaNucXSections.push_back(new G4ASCCrossSection(113, 2212, 13.7, 35.9, 0.45, 0.079)); 00034 // omega0 Nucleon 00035 theGammaNucXSections.push_back(new G4ASCCrossSection(223, 2212, 13.7, 35.9, 0.45, 0.079)); 00036 // phi0 Nucleon 00037 theGammaNucXSections.push_back(new G4ASCCrossSection(333, 2212, 12.2, 26.4, 0.50, 0.079)); 00038 } 00039 00040 G4bool G4GammaAnnCrossSection:: 00041 InCharge(G4int aCode, G4int bCode) 00042 { 00043 G4bool result = false; 00044 if(aCode==G4Gamma::Gamma()->GetPDGEncoding()) 00045 { 00046 result=true; 00047 } 00048 else if(bCode==G4Gamma::Gamma()->GetPDGEncoding()) 00049 { 00050 result = true; 00051 } 00052 return result; 00053 } 00054 00055 G4double G4GammaAnnCrossSection:: 00056 GetXsec(G4double S) 00057 { 00058 G4double result = 0; 00059 // ratios from Phys.Lett.B40:121-126,1972; 22% assigned to higher resonances 00060 00061 typedef std::vector<G4ASCCrossSection*>::iterator iter; 00062 iter i; 00063 for(i=theGammaNucXSections.begin(); i!=theGammaNucXSections.end(); i++) 00064 { 00065 result += (*i)->GetXsec(S); 00066 } 00067 00068 // Account for higher resonances. 00069 result /= 0.78; 00070 00071 return result; 00072 }