G4AblaInterface.cc

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//
// ABLAXX statistical de-excitation model
// Pekka Kaitaniemi, HIP (translation)
// Christelle Schmidt, IPNL (fission code)
// Davide Mancusi, CEA (contact person INCL/ABLA)
// Aatos Heikkinen, HIP (project coordination)
//
#define ABLAXX_IN_GEANT4_MODE 1

#include "globals.hh"

#ifdef ABLAXX_IN_GEANT4_MODE

#include "G4AblaInterface.hh"
#include "G4ParticleDefinition.hh"
#include "G4ReactionProductVector.hh"
#include "G4ReactionProduct.hh"
#include "G4DynamicParticle.hh"
#include "G4IonTable.hh"
#include "G4SystemOfUnits.hh"
#include "G4PhysicalConstants.hh"
#include <iostream>
#include <cmath>

G4AblaInterface::G4AblaInterface() :
  G4VPreCompoundModel(NULL, "ABLA"),
  ablaResult(new G4VarNtp),
  volant(new G4Volant),
  theABLAModel(new G4Abla(volant, ablaResult)),
  eventNumber(0)
{
  theABLAModel->initEvapora();
}

G4AblaInterface::~G4AblaInterface() {
  delete volant;
  delete ablaResult;
  delete theABLAModel;
}

G4ReactionProductVector *G4AblaInterface::DeExcite(G4Fragment &aFragment) {
  volant->clear();
  ablaResult->clear();

  const G4int ARem = aFragment.GetA_asInt();
  const G4int ZRem = aFragment.GetZ_asInt();
  const G4double nuclearMass = aFragment.GetGroundStateMass() / MeV;
  const G4double eStarRem = aFragment.GetExcitationEnergy() / MeV;
  const G4double jRem = aFragment.GetAngularMomentum().mag() / hbar_Planck;
  const G4LorentzVector &pRem = aFragment.GetMomentum();
  const G4double eTotRem = pRem.e();
  const G4double eKinRem = (eTotRem - pRem.invariantMass()) / MeV;
  const G4double pxRem = pRem.x() / MeV;
  const G4double pyRem = pRem.y() / MeV;
  const G4double pzRem = pRem.z() / MeV;

  eventNumber++;

  theABLAModel->breakItUp(ARem, ZRem,
                          nuclearMass,
                          eStarRem,
                          jRem,
                          eKinRem,
                          pxRem,
                          pyRem,
                          pzRem,
                          eventNumber);

  G4ReactionProductVector *result = new G4ReactionProductVector;

  for(int j = 0; j < ablaResult->ntrack; ++j) { // Copy ABLA result to the EventInfo
    G4ReactionProduct *product = toG4Particle(ablaResult->avv[j],
                                              ablaResult->zvv[j],
                                              ablaResult->enerj[j],
                                              ablaResult->plab[j]*std::sin(ablaResult->tetlab[j]*pi/180.0)*std::cos(ablaResult->philab[j]*pi/180.0),
                                              ablaResult->plab[j]*std::sin(ablaResult->tetlab[j]*pi/180.0)*std::sin(ablaResult->philab[j]*pi/180.0),
                                              ablaResult->plab[j]*std::cos(ablaResult->tetlab[j]*pi/180.0));
    if(product)
      result->push_back(product);
  }
  return result;
}

G4ParticleDefinition *G4AblaInterface::toG4ParticleDefinition(G4int A, G4int Z) const {
  if     (A == 1 && Z == 1)  return G4Proton::Proton();
  else if(A == 1 && Z == 0)  return G4Neutron::Neutron();
  else if(A == 0 && Z == 1)  return G4PionPlus::PionPlus();
  else if(A == 0 && Z == -1) return G4PionMinus::PionMinus();
  else if(A == 0 && Z == 0)  return G4PionZero::PionZero();
  else if(A == 2 && Z == 1)  return G4Deuteron::Deuteron();
  else if(A == 3 && Z == 1)  return G4Triton::Triton();
  else if(A == 3 && Z == 2)  return G4He3::He3();
  else if(A == 4 && Z == 2)  return G4Alpha::Alpha();
  else if(A > 0 && Z > 0 && A >= Z) { // Returns ground state ion definition
    return G4IonTable::GetIonTable()->GetIon(Z, A, 0);
  } else { // Error, unrecognized particle
    G4cout << "Can't convert particle with A=" << A << ", Z=" << Z << " to G4ParticleDefinition, trouble ahead" << G4endl;
    return 0;
  }
}

G4ReactionProduct *G4AblaInterface::toG4Particle(G4int A, G4int Z,
                         G4double kinE,
                         G4double px,
                                                 G4double py, G4double pz) const {
  G4ParticleDefinition *def = toG4ParticleDefinition(A, Z);
  if(def == 0) { // Check if we have a valid particle definition
    return 0;
  }
  const double energy = kinE * MeV;
  const G4ThreeVector momentum(px, py, pz);
  const G4ThreeVector momentumDirection = momentum.unit();
  G4DynamicParticle p(def, momentumDirection, energy);
  G4ReactionProduct *r = new G4ReactionProduct(def);
  (*r) = p;
  return r;
}

void G4AblaInterface::ModelDescription(std::ostream& outFile) const {
   outFile << "ABLA V3 does not provide an implementation of the ApplyYourself method!\n\n";
}

void G4AblaInterface::DeExciteModelDescription(std::ostream& outFile) const {
   outFile << "ABLA V3 is a statistical model for nuclear de-excitation. It simulates\n"
     << "evaporation of neutrons, protons and alpha particles, as well as fission\n"
     << "where applicable. The code included in Geant4 is a C++ translation of the\n"
     << "original Fortran code. More details about the physics are available in the\n"
     << "the Geant4 Physics Reference Manual and in the reference articles.\n\n"
     << "References: A.R. Junghans et al., Nucl. Phys. A629 (1998) 635;\n"
     << "            J. Benlliure et al., Nucl. Phys. A628 (1998) 458.\n\n"; }

#endif // ABLAXX_IN_GEANT4_MODE