| 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