Gabriele Cosmo
125 lines
4.0 KiB
C++
125 lines
4.0 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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#ifndef G4CrossSectionBuffer_h
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#define G4CrossSectionBuffer_h
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#include <utility>
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#include <vector>
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#include <CLHEP/Units/SystemOfUnits.h>
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#include "globals.hh"
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#include "G4ParticleDefinition.hh"
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#include "G4KineticTrack.hh"
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class G4CrossSectionBuffer
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{
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public:
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G4CrossSectionBuffer(const G4ParticleDefinition * aA, const G4ParticleDefinition * aB)
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: theA(aA), theB(aB) {}
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G4bool InCharge(const G4ParticleDefinition * aA, const G4ParticleDefinition * aB) const
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{
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G4bool result = false;
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if(aA == theA)
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{
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if(aB == theB) result = true;
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}
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else if(aA == theB)
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{
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if(aB == theA) result = true;
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}
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return result;
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}
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void push_back(G4double S, G4double x)
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{
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std::pair<G4double, G4double> aNew;
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aNew.first = S;
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aNew.second = x;
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theData.push_back(aNew);
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}
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G4double 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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G4double x1(1), y1(0);
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G4double x2(2), y2(0);
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if(theData.size()==1) return theData[theData.size()-1].second;
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for(size_t i=0; i<theData.size(); i++)
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{
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if(theData[i].first>sqrts)
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{
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if(0==i)
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{
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x1 = theData[i].first;
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y1 = theData[i].second;
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x2 = theData[i+1].first;
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y2 = theData[i+1].second;
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}
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else if(theData.size()-1==i)
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{
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x1 = theData[theData.size()-2].first;
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y1 = theData[theData.size()-2].second;
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x2 = theData[theData.size()-1].first;
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y2 = theData[theData.size()-1].second;
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}
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else
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{
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x1 = theData[i-1].first;
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y1 = theData[i-1].second;
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x2 = theData[i].first;
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y2 = theData[i].second;
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}
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break;
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}
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}
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// LINLIN interpolation
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// G4cerr << "!!!!!! "<<sqrts<<" "<<x1<<" "<<x2<<" "<<y1<<" "<<y2<<" "<<i<<G4endl;
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G4double result = y1 + (sqrts-x1) * (y2-y1)/(x2-x1);
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if(result<0) result = 0;
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if(y1<0.01*CLHEP::millibarn) result = 0;
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return result;
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}
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void Print()
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{
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for(size_t i=0;i<theData.size(); i++)
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{
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G4cerr << "sqrts = "<<theData[i].first<<", X = "<<theData[i].second/CLHEP::millibarn<<G4endl;
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}
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}
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private:
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std::vector<std::pair<G4double, G4double> > theData;
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const G4ParticleDefinition * theA;
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const G4ParticleDefinition * theB;
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};
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#endif
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