G4INCLEventInfo.cc

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//
// INCL++ intra-nuclear cascade model
// Pekka Kaitaniemi, CEA and Helsinki Institute of Physics
// Davide Mancusi, CEA
// Alain Boudard, CEA
// Sylvie Leray, CEA
// Joseph Cugnon, University of Liege
//
#define INCLXX_IN_GEANT4_MODE 1

#include "globals.hh"

#include "G4INCLEventInfo.hh"
#include "G4INCLGlobals.hh"
#include "G4INCLParticleTable.hh"
#include <cmath>

namespace G4INCL {

  Int_t EventInfo::eventNumber = 0;

#ifdef INCL_INVERSE_KINEMATICS
  void EventInfo::fillInverseKinematics(const Double_t gamma) {
    const Double_t beta = std::sqrt(1.-1./(gamma*gamma));
    for(Int_t i=0; i<nParticles; ++i) {
      Double_t mass;
      if(A[i]>0) {
        mass = ParticleTable::getTableMass(A[i],Z[i]);
      } else if(origin[i]==-1) { // cascade particles with A=0, must be pions
        if(Z[i]==1)
          mass = ParticleTable::getTableParticleMass(PiPlus);
        else if(Z[i]==0)
          mass = ParticleTable::getTableParticleMass(PiZero);
        else
          mass = ParticleTable::getTableParticleMass(PiMinus);
      } else // gamma rays
        mass = 0.;

      const Double_t ETot = EKin[i] + mass;
      const Double_t ETotPrime = gamma*(ETot - beta*pz[i]);
      /* Using the invariant mass here avoids negative kinetic energies with
       * particles produced by the de-excitation models, which do not
       * necessarily use the same mass look-up tables as INCL.
       */
      Double_t invariantMass;
      if(A[i]>0 || origin[i]==-1) { // massive particles
        invariantMass = std::sqrt(ETot*ETot - px[i]*px[i] - py[i]*py[i] - pz[i]*pz[i]);
      } else { // gamma rays
        invariantMass = 0.;
      }
      EKinPrime[i] = ETotPrime - invariantMass;
      pzPrime[i] = -gamma*(pz[i] - beta*ETot);
      const Double_t pPrime = std::sqrt(px[i]*px[i] + py[i]*py[i] + pzPrime[i]*pzPrime[i]);
      const Double_t cosThetaPrime = pzPrime[i]/pPrime;
      if(cosThetaPrime>=1.)
        thetaPrime[i] = 0.;
      else if(cosThetaPrime<=-1.)
        thetaPrime[i] = 180.;
      else
        thetaPrime[i] = 180.*std::acos(cosThetaPrime)/Math::pi;
    }
  }
#endif // INCL_INVERSE_KINEMATICS
}