G4FissionLibrary.cc

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// Copyright (c) 2006 The Regents of the University of California.
// All rights reserved.
// UCRL-CODE-224807
//
//
// $Id$
//
// neutron_hp -- source file
// J.M. Verbeke, Jan-2007
// A low energy neutron-induced fission model.
//
 
#include "G4FissionLibrary.hh"
#include "G4SystemOfUnits.hh"
 
G4FissionLibrary::G4FissionLibrary()
  : G4NeutronHPFinalState(), theIsotope(0), targetMass(0.0)
{
  hasXsec = false;
}
 
G4FissionLibrary::~G4FissionLibrary()
{}
 
G4NeutronHPFinalState * G4FissionLibrary::New()
{
  G4FissionLibrary * theNew = new G4FissionLibrary;
  return theNew;
}
 
//void G4FissionLibrary::Init (G4double A, G4double Z, G4String & dirName, G4String &)
void G4FissionLibrary::Init (G4double A, G4double Z, G4int M, G4String & dirName, G4String &)
{
  G4String tString = "/FS/";
  G4bool dbool;
  theIsotope = static_cast<G4int>(1000*Z+A);
  G4NeutronHPDataUsed aFile = theNames.GetName(static_cast<G4int>(A), static_cast<G4int>(Z), M, dirName, tString, dbool);
  G4String filename = aFile.GetName();
 
  if(!dbool)
  {
    hasAnyData = false;
    hasFSData = false;
    hasXsec = false;
    return;
  }
  std::ifstream theData(filename, std::ios::in);
 
  // here it comes
  G4int infoType, dataType;
  hasFSData = false;
  while (theData >> infoType)
  {
    hasFSData = true;
    theData >> dataType;
    switch(infoType)
    {
      case 1:
        if(dataType==4) theNeutronAngularDis.Init(theData);
        if(dataType==5) thePromptNeutronEnDis.Init(theData);
        if(dataType==12) theFinalStatePhotons.InitMean(theData);
        if(dataType==14) theFinalStatePhotons.InitAngular(theData);
        if(dataType==15) theFinalStatePhotons.InitEnergies(theData);
        break;
      case 2:
        if(dataType==1) theFinalStateNeutrons.InitMean(theData);
        break;
      case 3:
        if(dataType==1) theFinalStateNeutrons.InitDelayed(theData);
        if(dataType==5) theDelayedNeutronEnDis.Init(theData);
        break;
      case 4:
        if(dataType==1) theFinalStateNeutrons.InitPrompt(theData);
        break;
      case 5:
        if(dataType==1) theEnergyRelease.Init(theData);
        break;
      default:
        G4cout << "G4FissionLibrary::Init: unknown data type"<<dataType<<G4endl;
        throw G4HadronicException(__FILE__, __LINE__, "G4FissionLibrary::Init: unknown data type");
        break;
    }
  }
  targetMass = theFinalStateNeutrons.GetTargetMass();
  theData.close();
}
 
G4HadFinalState * G4FissionLibrary::ApplyYourself(const G4HadProjectile & theTrack)
{  
  theResult.Clear();
 
// prepare neutron
  G4double eKinetic = theTrack.GetKineticEnergy();
  const G4HadProjectile *incidentParticle = &theTrack;
  G4ReactionProduct theNeutron( const_cast<G4ParticleDefinition *>(incidentParticle->GetDefinition()) );
  theNeutron.SetMomentum( incidentParticle->Get4Momentum().vect() );
  theNeutron.SetKineticEnergy( eKinetic );
 
// prepare target
  G4Nucleus aNucleus;
  G4ReactionProduct theTarget; 
  G4ThreeVector neuVelo = (1./incidentParticle->GetDefinition()->GetPDGMass())*theNeutron.GetMomentum();
  theTarget = aNucleus.GetBiasedThermalNucleus( targetMass, neuVelo, theTrack.GetMaterial()->GetTemperature());
 
// set neutron and target in the FS classes 
  theNeutronAngularDis.SetNeutron(theNeutron);
  theNeutronAngularDis.SetTarget(theTarget);
 
// boost to target rest system
  theNeutron.Lorentz(theNeutron, -1*theTarget);
 
  eKinetic = theNeutron.GetKineticEnergy();    
 
// dice neutron and gamma multiplicities, energies and momenta in Lab. @@
// no energy conservation on an event-to-event basis. we rely on the data to be ok. @@
// also for mean, we rely on the consistency of the data. @@
 
  G4int nPrompt=0, gPrompt=0;
  SampleMult(theTrack, &nPrompt, &gPrompt, eKinetic);
 
// Build neutrons and add them to dynamic particle vector
  G4double momentum;
  for(G4int i=0; i<nPrompt; i++)
  {
    G4DynamicParticle * it = new G4DynamicParticle;
    it->SetDefinition(G4Neutron::Neutron());
    it->SetKineticEnergy(getneng_(&i)*MeV);
    momentum = it->GetTotalMomentum();
    G4ThreeVector temp(momentum*getndircosu_(&i), 
                       momentum*getndircosv_(&i), 
                       momentum*getndircosw_(&i));
    it->SetMomentum( temp );
//    it->SetGlobalTime(getnage_(&i)*second);
    theResult.AddSecondary(it);
//    G4cout <<"G4FissionLibrary::ApplyYourself: energy of prompt neutron " << i << " = " << it->GetKineticEnergy()<<G4endl;
  }
 
// Build gammas, lorentz transform them, and add them to dynamic particle vector
  for(G4int i=0; i<gPrompt; i++)
  {
    G4ReactionProduct * thePhoton = new G4ReactionProduct;
    thePhoton->SetDefinition(G4Gamma::Gamma());
    thePhoton->SetKineticEnergy(getpeng_(&i)*MeV);
    momentum = thePhoton->GetTotalMomentum();
    G4ThreeVector temp(momentum*getpdircosu_(&i), 
                       momentum*getpdircosv_(&i), 
                       momentum*getpdircosw_(&i));
    thePhoton->SetMomentum( temp );
    thePhoton->Lorentz(*thePhoton, -1.*theTarget);
    
    G4DynamicParticle * it = new G4DynamicParticle;
    it->SetDefinition(thePhoton->GetDefinition());
    it->SetMomentum(thePhoton->GetMomentum());
//    it->SetGlobalTime(getpage_(&i)*second);
//    G4cout <<"G4FissionLibrary::ApplyYourself: energy of prompt photon " << i << " = " << it->GetKineticEnergy()<<G4endl;
    theResult.AddSecondary(it);
    delete thePhoton;  
  }
//  G4cout <<"G4FissionLibrary::ApplyYourself: Number of secondaries = "<<theResult.GetNumberOfSecondaries()<< G4endl;
//  G4cout <<"G4FissionLibrary::ApplyYourself: Number of induced prompt neutron = "<<nPrompt<<G4endl;
//  G4cout <<"G4FissionLibrary::ApplyYourself: Number of induced prompt photons = "<<gPrompt<<G4endl;
 
// finally deal with local energy depositions.
  G4double eDepByFragments = theEnergyRelease.GetFragmentKinetic();
  theResult.SetLocalEnergyDeposit(eDepByFragments);
//   G4cout << "G4FissionLibrary::local energy deposit" << eDepByFragments<<G4endl;
// clean up the primary neutron
  theResult.SetStatusChange(stopAndKill);
  return &theResult;
}
 
void G4FissionLibrary::SampleMult(const G4HadProjectile & theTrack, G4int* nPrompt,
                                   G4int* gPrompt, G4double eKinetic)
{
   G4double promptNeutronMulti = 0;
   promptNeutronMulti = theFinalStateNeutrons.GetPrompt(eKinetic); // prompt nubar from Geant
   G4double delayedNeutronMulti = 0;
   delayedNeutronMulti = theFinalStateNeutrons.GetDelayed(eKinetic); // delayed nubar from Geant
 
   G4double time = theTrack.GetGlobalTime()/second;
   if(delayedNeutronMulti==0&&promptNeutronMulti==0) {
     // no data for prompt and delayed neutrons in Geant
     // but there is perhaps data for the total neutron multiplicity, in which case 
     // we use it for prompt neutron emission
     G4double totalNeutronMulti = theFinalStateNeutrons.GetMean(eKinetic);
     genfissevt_(&theIsotope, &time, &totalNeutronMulti, &eKinetic);
   } else {
     // prompt nubar != 0 || delayed nubar != 0
     genfissevt_(&theIsotope, &time, &promptNeutronMulti, &eKinetic);
   }
   *nPrompt = getnnu_();
   if (*nPrompt == -1) *nPrompt = 0; // the fission library libFission.a has no data for neutrons
   *gPrompt = getpnu_();
   if (*gPrompt == -1) *gPrompt = 0; // the fission library libFission.a has no data for gammas
}