G4PiData.cc

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// by J.P Wellisch, Sun Sep 15 2002.
 
#include "G4PiData.hh"
#include "G4SystemOfUnits.hh"
 
 
G4PiData::G4PiData(const G4double * aT, const G4double * aIn, 
                   const G4double * anE, G4int nP)
{
  G4int i=0;
 
  for( i = 0; i < nP; i++ )
  {
    std::pair<G4double, G4double> x;
    x.first=aT[i]*millibarn;
    x.second=aIn[i]*millibarn;
    std::pair<G4double, std::pair<G4double, G4double > > aP;
    aP.first=anE[i]*GeV;
    aP.second=x;
    push_back(aP);
  }
}
 
 
G4bool G4PiData::AppliesTo(G4double kineticEnergy)
{
  return (kineticEnergy<=back().first);
}
 
 
G4double G4PiData::ReactionXSection(G4double kineticEnergy)
{
  G4double result = 0;
  G4PiData::iterator it=begin();
  while(it!=end()&&kineticEnergy>(*it).first) {it++;}  /* Loop checking, 08.01.2016, W. Pokorski */
  if(it==end()) 
  {
    G4ExceptionDescription ed;
    ed << "This cross section is applied for E(MeV)= " << kineticEnergy
       << " outside allowed energy interval" << G4endl; 
    G4Exception("G4PiData::ReactionXSection", "had001", FatalException, ed);
  }
  if(it==begin()) it++;
  G4double x1,x2,e1,e2;
  e1=(*(it-1)).first;
  x1=(*(it-1)).second.second;
  e2=(*(it)).first;
  x2=(*(it)).second.second;
  result = std::max(0., x1 + (kineticEnergy-e1)*(x2-x1)/(e2-e1));
  return result;
}
 
 
G4double G4PiData::ElasticXSection(G4double kineticEnergy)
{
  G4double result = 0;
  G4PiData::iterator it=begin();
  while(it!=end()&&kineticEnergy>(*it).first) {it++;}  /* Loop checking, 08.01.2016, W. Pokorski */
  if(it==end()) 
  {
    G4ExceptionDescription ed;
    ed << "This cross section is applied for E(MeV)= " << kineticEnergy
       << " outside allowed energy interval" << G4endl; 
    G4Exception("G4PiData::ElasticXSection", "had001", FatalException, ed);
  }
  if(it==begin()) it++;
  G4double x1,x2,e1,e2;
  e1=(*(it-1)).first;
  x1=(*(it-1)).second.first - (*(it-1)).second.second;
  e2=(*(it)).first;
  x2=(*(it)).second.first - (*(it)).second.second;
  result = std::max(0., x1 + (kineticEnergy-e1)*(x2-x1)/(e2-e1));
  return result;
}
 
 
G4double G4PiData::TotalXSection(G4double kineticEnergy)
{
  G4double result = 0;
  G4PiData::iterator it=begin();
  while(it!=end()&&kineticEnergy>(*it).first) {it++;}  /* Loop checking, 08.01.2016, W. Pokorski */
  if(it==end()) 
  {
    G4ExceptionDescription ed;
    ed << "This cross section is applied for E(MeV)= " << kineticEnergy
       << " outside allowed energy interval" << G4endl; 
    G4Exception("G4PiData::TotalXSection", "had001", FatalException, ed);
  }
  if(it==begin()) it++;
  G4double x1,x2,e1,e2;
  e1=(*(it-1)).first;
  x1=(*(it-1)).second.first;
  e2=(*(it)).first;
  x2=(*(it)).second.first;
  result = std::max(0., x1 + (kineticEnergy-e1)*(x2-x1)/(e2-e1));
  return result;
}