Gabriele Cosmo
91 lines
4.5 KiB
C++
91 lines
4.5 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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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. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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#include <cmath>
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#include "G4Exp.hh"
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#include "G4Log.hh"
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#include "G4XpimNTotal.hh"
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#include "G4SystemOfUnits.hh"
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G4XpimNTotal::
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G4XpimNTotal()
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{
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std::pair<double,double> it;
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it.first=1105.46 ;it.second= 8.8; theLowEData.push_back(it);
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it.first=1139.41 ;it.second= 13.6; theLowEData.push_back(it);
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it.first=1165.12 ;it.second= 26.0; theLowEData.push_back(it);
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it.first=1198.8 ;it.second= 60.; theLowEData.push_back(it);
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it.first=1212.51 ;it.second= 70.; theLowEData.push_back(it);
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it.first=1222.84 ;it.second= 72.; theLowEData.push_back(it);
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it.first=1233.18 ;it.second= 68.; theLowEData.push_back(it);
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it.first=1240.08 ;it.second= 65.; theLowEData.push_back(it);
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it.first=1301.86 ;it.second= 30.; theLowEData.push_back(it);
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it.first=1335.65 ;it.second= 26.; theLowEData.push_back(it);
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it.first=1368.93 ;it.second= 27.; theLowEData.push_back(it);
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it.first=1433.81 ;it.second= 30.; theLowEData.push_back(it);
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it.first=1496.42 ;it.second= 45.; theLowEData.push_back(it);
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it.first=1508.67 ;it.second= 47.; theLowEData.push_back(it);
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it.first=1520.84 ;it.second= 45.; theLowEData.push_back(it);
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it.first=1568.67 ;it.second= 35.; theLowEData.push_back(it);
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it.first=1603.69 ;it.second= 37.; theLowEData.push_back(it);
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it.first=1660.54 ;it.second= 58.; theLowEData.push_back(it);
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it.first=1674.47 ;it.second= 59.; theLowEData.push_back(it);
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it.first=1688.29 ;it.second= 58.; theLowEData.push_back(it);
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it.first=1779.57 ;it.second= 36.; theLowEData.push_back(it);
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it.first=1881.49 ;it.second= 36.8; theLowEData.push_back(it);
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it.first=1978.31 ;it.second= 34.5; theLowEData.push_back(it);
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it.first=2038.82 ;it.second= 34.5; theLowEData.push_back(it);
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it.first=2115.39 ;it.second= 36.; theLowEData.push_back(it);
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it.first=2159.18 ;it.second= 36.3; theLowEData.push_back(it);
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it.first=2244.22 ;it.second= 36.; theLowEData.push_back(it);
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it.first=2424.78 ;it.second= 33.; theLowEData.push_back(it);
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it.first=2664.2 ;it.second= 32.; theLowEData.push_back(it);
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it.first=3487.43 ;it.second= 28.; theLowEData.push_back(it);
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it.first=4434.76 ;it.second= 26.7; theLowEData.push_back(it);
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}
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G4double G4XpimNTotal::
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CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const
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{
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G4double sqrts = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag();
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if(sqrts > theLowEData.back().first/MeV) return thePDGData.CrossSection(trk1, trk2);
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G4double result = 0;
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size_t i(0), it(0);
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if(sqrts<theLowEData[0].first) return 0;
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for(i=0; i<theLowEData.size(); i++)
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{
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if(theLowEData[i].first/MeV>sqrts) break;
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it = i;
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}
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G4double x1 = G4Log(theLowEData[it].first);
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G4double x2 = G4Log(theLowEData[it+1].first);
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G4double y1 = G4Log(theLowEData[it].second);
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G4double y2 = G4Log(theLowEData[it+1].second);
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G4double x = G4Log(sqrts);
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G4double y = y1+(x-x1)*(y2-y1)/(x2-x1);
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result = G4Exp(y);
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return result*millibarn;
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}
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