Geant4 Cross Reference |
1 // 1 2 // ******************************************* 3 // * License and Disclaimer 4 // * 5 // * The Geant4 software is copyright of th 6 // * the Geant4 Collaboration. It is provided 7 // * conditions of the Geant4 Software License 8 // * LICENSE and available at http://cern.ch/ 9 // * include a list of copyright holders. 10 // * 11 // * Neither the authors of this software syst 12 // * institutes,nor the agencies providing fin 13 // * work make any representation or warran 14 // * regarding this software system or assum 15 // * use. Please see the license in the file 16 // * for the full disclaimer and the limitatio 17 // * 18 // * This code implementation is the result 19 // * technical work of the GEANT4 collaboratio 20 // * By using, copying, modifying or distri 21 // * any work based on the software) you ag 22 // * use in resulting scientific publicati 23 // * acceptance of all terms of the Geant4 Sof 24 // ******************************************* 25 // 26 27 #include <cmath> 28 #include "G4Exp.hh" 29 #include "G4Log.hh" 30 #include "G4LowEXsection.hh" 31 #include "G4SystemOfUnits.hh" 32 33 G4double G4LowEXsection:: 34 CrossSection(G4double aX) const 35 { 36 G4double result = 0; 37 if(aX<front().first) return 0; 38 G4LowEXsection::const_iterator i; 39 G4LowEXsection::const_iterator it=end(); 40 for(i=begin(); i!=end(); i++) 41 { 42 if((*i).first/MeV>aX) break; 43 it = i; 44 } 45 G4double x1 = G4Log((*it).first); 46 G4double x2 = G4Log((*(it+1)).first); 47 G4double y1 = G4Log((*it).second); 48 G4double y2 = G4Log((*(it+1)).second); 49 G4double x = G4Log(aX); 50 G4double y = y1+(x-x1)*(y2-y1)/(x2-x1); 51 result = G4Exp(y); 52 return result*millibarn; 53 } 54