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// This software was developed by Lawrence Livermore National Laboratory.
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// Copyright (c) 2006 The Regents of the University of California.
// All rights reserved.
// UCRL-CODE-224807
//
//
// $Id: G4FissLib.cc,v 1.2 2007/06/27 09:57:42 gcosmo Exp $
//
// neutron_hp -- source file
// J.M. Verbeke, Jan-2007
// A prototype of the low energy neutron transport model.
//
#include "G4FissLib.hh"

G4FissLib::G4FissLib()
{
  SetMinEnergy( 0.0 );
  SetMaxEnergy( 20.*MeV );
  if(!getenv("G4NEUTRONHPDATA")) {
     G4cout << "Please setenv G4NEUTRONHPDATA to point to the neutron cross-section files." << G4endl;
     throw G4HadronicException(__FILE__, __LINE__, "Please setenv G4NEUTRONHPDATA to point to the neutron cross-section files.");
  }
  dirName = getenv("G4NEUTRONHPDATA");
  G4String tString = "/Fission/";
  dirName = dirName + tString;
  numEle = G4Element::GetNumberOfElements();
  theFission = new G4NeutronHPChannel[numEle];

  for (G4int i=0; i<numEle; i++)
  { 
//    G4cout << "G4FissLib::G4FissLib(): element "<< i << " : " << (*(G4Element::GetElementTable()))[i]->GetZ()<< G4endl;
    if((*(G4Element::GetElementTable()))[i]->GetZ()>89)
    {
      theFission[i].Init((*(G4Element::GetElementTable()))[i], dirName);
      theFission[i].Register(&theLibrary);
    }
  }
}
  
G4FissLib::~G4FissLib()
{
  delete [] theFission;
}
  
G4HadFinalState * G4FissLib::ApplyYourself(const G4HadProjectile& aTrack, G4Nucleus& )
{
  const G4Material * theMaterial = aTrack.GetMaterial();
  G4int n = theMaterial->GetNumberOfElements();
  G4int index = theMaterial->GetElement(0)->GetIndex();
  if(n!=1)
  {
    xSec = new G4double[n];
    G4double sum=0;
    G4int i, index;
    const G4double * NumAtomsPerVolume = theMaterial->GetVecNbOfAtomsPerVolume();
    G4double rWeight;    
    G4NeutronHPThermalBoost aThermalE;
    for (i=0; i<n; i++)
    {
      index = theMaterial->GetElement(i)->GetIndex();
      rWeight = NumAtomsPerVolume[i];
      xSec[i] = theFission[index].GetXsec(aThermalE.GetThermalEnergy(aTrack,
		                                                      theMaterial->GetElement(i),
  						      theMaterial->GetTemperature()));
      xSec[i] *= rWeight;
      sum+=xSec[i];
    }
    G4double random = G4UniformRand();
    G4double running = 0;
    for (i=0; i<n; i++)
    {
      running += xSec[i];
      index = theMaterial->GetElement(i)->GetIndex();
      if(random<=running/sum) break;
    }
    delete [] xSec;
  }

  return theFission[index].ApplyYourself(aTrack);
}