| 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | #include "G4LowEXsection.hh" |
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| 27 | #include <cmath> |
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| 28 | |
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| 29 | G4double G4LowEXsection:: |
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| 30 | CrossSection(G4double aX) const |
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| 31 | { |
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| 32 | G4double result = 0; |
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| 33 | if(aX<front().first) return 0; |
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| 34 | G4LowEXsection::const_iterator i; |
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| 35 | G4LowEXsection::const_iterator it=end(); |
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| 36 | for(i=begin(); i!=end(); i++) |
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| 37 | { |
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| 38 | if((*i).first/MeV>aX) break; |
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| 39 | it = i; |
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| 40 | } |
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| 41 | G4double x1 = std::log((*it).first); |
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| 42 | G4double x2 = std::log((*(it+1)).first); |
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| 43 | G4double y1 = std::log((*it).second); |
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| 44 | G4double y2 = std::log((*(it+1)).second); |
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| 45 | G4double x = std::log(aX); |
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| 46 | G4double y = y1+(x-x1)*(y2-y1)/(x2-x1); |
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| 47 | result = std::exp(y); |
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| 48 | return result*millibarn; |
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| 49 | } |
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