Geant4  9.6.p02
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G4LowEXsection.cc
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26 
27 #include <cmath>
28 
29 #include "G4LowEXsection.hh"
30 #include "G4SystemOfUnits.hh"
31 
34  {
35  G4double result = 0;
36  if(aX<front().first) return 0;
37  G4LowEXsection::const_iterator i;
38  G4LowEXsection::const_iterator it=end();
39  for(i=begin(); i!=end(); i++)
40  {
41  if((*i).first/MeV>aX) break;
42  it = i;
43  }
44  G4double x1 = std::log((*it).first);
45  G4double x2 = std::log((*(it+1)).first);
46  G4double y1 = std::log((*it).second);
47  G4double y2 = std::log((*(it+1)).second);
48  G4double x = std::log(aX);
49  G4double y = y1+(x-x1)*(y2-y1)/(x2-x1);
50  result = std::exp(y);
51  return result*millibarn;
52  }