Gabriele Cosmo
47 lines
2.0 KiB
C++
47 lines
2.0 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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#include "G4LowEXsection.hh"
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#include <cmath>
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G4double G4LowEXsection::
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CrossSection(G4double aX) const
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{
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G4double result = 0;
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if(aX<front().first) return 0;
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G4LowEXsection::const_iterator i;
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G4LowEXsection::const_iterator it=end();
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for(i=begin(); i!=end(); i++)
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{
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if((*i).first/MeV>aX) break;
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it = i;
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}
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G4double x1 = std::log((*it).first);
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G4double x2 = std::log((*(it+1)).first);
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G4double y1 = std::log((*it).second);
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G4double y2 = std::log((*(it+1)).second);
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G4double x = std::log(aX);
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G4double y = y1+(x-x1)*(y2-y1)/(x2-x1);
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result = std::exp(y);
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return result*millibarn;
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}
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