G4NeutronInelasticXS.cc

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// $Id: G4NeutronInelasticXS.cc 110787 2018-06-14 06:43:31Z gcosmo $
//
// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:    G4NeutronInelasticXS
//
// Author  Ivantchenko, Geant4, 3-Aug-09
//
// Modifications:
//

#include "G4NeutronInelasticXS.hh"
#include "G4Neutron.hh"
#include "G4DynamicParticle.hh"
#include "G4Element.hh"
#include "G4ElementTable.hh"
#include "G4PhysicsLogVector.hh"
#include "G4PhysicsVector.hh"
#include "G4ComponentGGHadronNucleusXsc.hh"
#include "G4HadronNucleonXsc.hh"
#include "G4NistManager.hh"
#include "G4Proton.hh"
#include "Randomize.hh"

#include <iostream>
#include <fstream>
#include <sstream>

// factory
#include "G4CrossSectionFactory.hh"
//
G4_DECLARE_XS_FACTORY(G4NeutronInelasticXS);

using namespace std;

const G4int G4NeutronInelasticXS::amin[] = {
  0,
  1,   4,   6,   9, 10,  12,  14,  16,  19,  20,  //1-10
 23,  24,  27,  28, 31,  32,  35,  36,  39,  40,  //11-20
 45,  46,  50,  50, 55,  54,  59,  58,  63,  64,  //21-30
 69,  70,  75,   0,  0,   0,   0,   0,   0,  90,  //31-40
  0,  92,   0,   0,  0, 102, 107, 106, 113, 112,  //41-50
  0,   0,   0,   0,  0,   0,   0,   0,   0,   0,  //51-60
  0,   0,   0,   0,  0,   0,   0,   0,   0,   0,  //61-70
  0,   0, 181, 180,  0,   0,   0, 192, 197,   0,  //71-80
  0, 204, 209,   0,  0,   0,   0,   0,   0,   0,  //81-90
  0, 235};
const G4int G4NeutronInelasticXS::amax[] = {
  0,
  1,   4,   7,   9, 11,  13,  15,  18,  19,  22,  //1-10
 23,  26,  27,  30, 31,  34,  37,  40,  41,  48,  //11-20
 45,  50,  51,  54, 55,  58,  59,  64,  65,  70,  //21-30
 71,  76,  75,   0,  0,   0,   0,   0,   0,  96,  //31-40
  0, 100,   0,   0,  0, 110, 109, 116, 115, 124,  //41-50
  0,   0,   0,   0,  0,   0,   0,   0,   0,   0,  //51-60
  0,   0,   0,   0,  0,   0,   0,   0,   0,   0,  //61-70
  0,   0, 181, 186,  0,   0,   0, 198, 197,   0,  //71-80
  0, 208, 209,   0,  0,   0,   0,   0,   0,   0,  //81-90
  0, 238};

G4double G4NeutronInelasticXS::coeff[] = {1.0};

G4ElementData* G4NeutronInelasticXS::data = nullptr;

#ifdef G4MULTITHREADED
  G4Mutex G4NeutronInelasticXS::neutronInelasticXSMutex = G4MUTEX_INITIALIZER;
#endif

G4NeutronInelasticXS::G4NeutronInelasticXS() 
  : G4VCrossSectionDataSet(Default_Name()),
    proton(G4Proton::Proton()), emax(20*CLHEP::MeV)
{
  //  verboseLevel = 0;
  if(verboseLevel > 0){
    G4cout << "G4NeutronInelasticXS::G4NeutronInelasticXS Initialise for Z < " 
      << MAXZINEL << G4endl;
  }
  ggXsection = new G4ComponentGGHadronNucleusXsc();
  fNucleon = new G4HadronNucleonXsc();
  isMaster = false;
}

G4NeutronInelasticXS::~G4NeutronInelasticXS()
{
  //G4cout << "G4NeutronInelasticXS::~G4NeutronInelasticXS() " 
  // << " isMaster= " << isMaster << "  data: " << data << G4endl;
  delete fNucleon;
  delete ggXsection;
  if(isMaster) { delete data; data = nullptr; }
}

void G4NeutronInelasticXS::CrossSectionDescription(std::ostream& outFile) const
{
  outFile << "G4NeutronInelasticXS calculates the neutron inelastic scattering\n"
          << "cross section on nuclei using data from the high precision\n"
          << "neutron database.  These data are simplified and smoothed over\n"
          << "the resonance region in order to reduce CPU time.\n"
          << "For high energy Glauber-Gribov cross section model is used\n";
}

G4bool 
G4NeutronInelasticXS::IsElementApplicable(const G4DynamicParticle*, 
            G4int, const G4Material*)
{
  return true;
}

G4bool 
G4NeutronInelasticXS::IsIsoApplicable(const G4DynamicParticle*,
              G4int, G4int,
              const G4Element*, const G4Material*)
{
  return true;
}

G4double G4NeutronInelasticXS::GetElementCrossSection(
         const G4DynamicParticle* aParticle,
   G4int ZZ, const G4Material*)
{
  G4double xs = 0.0;
  G4double ekin = aParticle->GetKineticEnergy();

  G4int Z = (ZZ >= MAXZINEL) ? MAXZINEL - 1 : ZZ; 

  G4PhysicsVector* pv = data->GetElementData(Z);
  //  G4cout  << "G4NeutronInelasticXS::GetCrossSection e= " << ekin 
  //  << " Z= " << Z << G4endl;

  // element was not initialised
  if(!pv || ekin <= pv->Energy(0)) { return xs; }

  if(ekin <= pv->GetMaxEnergy()) { 
    xs = pv->Value(ekin); 
  } else if(1 == Z) { 
    fNucleon->GetHadronNucleonXscPDG(aParticle, proton);
    xs = coeff[1]*fNucleon->GetInelasticHadronNucleonXsc();
  } else {          
    G4int Amean = 
      G4lrint(G4NistManager::Instance()->GetAtomicMassAmu(Z));
    ggXsection->GetIsoCrossSection(aParticle, Z, Amean);
    xs = coeff[Z]*ggXsection->GetInelasticGlauberGribovXsc();
  }

  if(verboseLevel > 0) {
    G4cout  << "Z= " << Z << " Ekin(MeV)= " << ekin/CLHEP::MeV 
      << ",  nElmXSinel(bn)= " << xs/CLHEP::barn 
      << G4endl;
  }
  return xs;
}

G4double G4NeutronInelasticXS::GetIsoCrossSection(
         const G4DynamicParticle* aParticle, 
   G4int Z, G4int A,
   const G4Isotope*, const G4Element*,
   const G4Material*)
{
  return IsoCrossSection(aParticle->GetKineticEnergy(), Z, A);
}

G4double 
G4NeutronInelasticXS::IsoCrossSection(G4double ekin, G4int ZZ, G4int A)
{
  G4double xs = 0.0;
  G4int Z = (ZZ >= MAXZINEL) ? MAXZINEL - 1 : ZZ; 

  /*
  G4cout << "IsoCrossSection  Z= " << Z << "  A= " << A 
         << "  Amin= " << amin[Z] << " Amax= " << amax[Z]
         << " E(MeV)= " << ekin << G4endl;
  */
  // first compute isotope cross section 
  if(ekin <=emax && amin[Z]>0 && A >= amin[Z] && A <= amax[Z]) {
    G4PhysicsVector* pviso = data->GetComponentDataByIndex(Z, A - amin[Z]);
    if(pviso) { 
      xs = pviso->Value(ekin); 
      if(verboseLevel > 0) {
  G4cout  << "IsoXS: Z= " << Z << " A= " << A 
    << " Ekin(MeV)= " << ekin/CLHEP::MeV 
    << ",  nElmXSinel(bn)= " << xs/CLHEP::barn << G4endl;
      }
      return xs;
    }
  }
  // isotope data are not available or applicable
  G4PhysicsVector* pv = data->GetElementData(Z);
  if(pv) { xs = pv->Value(ekin); }
  if(verboseLevel > 0) {
    G4cout  << "IsoXS: Z= " << Z << " A= " << A 
      << " Ekin(MeV)= " << ekin/CLHEP::MeV 
      << ",  nElmXSinel(bn)= " << xs/CLHEP::barn << G4endl;
  }
  return xs;
}

const G4Isotope* G4NeutronInelasticXS::SelectIsotope(
           const G4Element* anElement, G4double kinEnergy)
{
  size_t nIso = anElement->GetNumberOfIsotopes();
  const G4Isotope* iso = anElement->GetIsotope(0);

  //G4cout << "SelectIsotope NIso= " << nIso << G4endl;
  if(1 == nIso) { return iso; }

  // more than 1 isotope
  G4int Z = anElement->GetZasInt();
  //G4cout << "SelectIsotope Z= " << Z << G4endl;

  const G4double* abundVector = anElement->GetRelativeAbundanceVector();
  G4double q = G4UniformRand();
  G4double sum = 0.0;

  // isotope wise cross section not available
  size_t j;
  if(kinEnergy > emax || 0 >= amin[Z] || Z >= MAXZINEL) {
    for (j = 0; j<nIso; ++j) {
      sum += abundVector[j];
      if(q <= sum) {
  iso = anElement->GetIsotope(j);
  break;
      }
    }
    return iso;
  }

  // use isotope cross sections
  size_t nn = temp.size();
  if(nn < nIso) { temp.resize(nIso, 0.); }

  for (j=0; j<nIso; ++j) {
    //G4cout << j << "-th isotope " << (*isoVector)[j]->GetN() 
    //       <<  " abund= " << abundVector[j] << G4endl;
    sum += abundVector[j]*IsoCrossSection(kinEnergy, Z, 
            anElement->GetIsotope(j)->GetN());
    temp[j] = sum;
  }
  sum *= q;
  for (j = 0; j<nIso; ++j) {
    if(temp[j] >= sum) {
      iso = anElement->GetIsotope(j);
      break;
    }
  }
  return iso;
}

void 
G4NeutronInelasticXS::BuildPhysicsTable(const G4ParticleDefinition& p)
{
  if(verboseLevel > 0){
    G4cout << "G4NeutronInelasticXS::BuildPhysicsTable for " 
     << p.GetParticleName() << G4endl;
  }
  if(p.GetParticleName() != "neutron") { 
    G4ExceptionDescription ed;
    ed << p.GetParticleName() << " is a wrong particle type -"
       << " only neutron is allowed";
    G4Exception("G4NeutronInelasticXS::BuildPhysicsTable(..)","had012",
    FatalException, ed, "");
    return; 
  }

  if(!data) { 
#ifdef G4MULTITHREADED
    G4MUTEXLOCK(&neutronInelasticXSMutex);
    if(!data) { 
#endif
      isMaster = true;
      data = new G4ElementData(); 
      data->SetName("NeutronInelastic");
      temp.resize(13,0.0);
#ifdef G4MULTITHREADED
    }
    G4MUTEXUNLOCK(&neutronInelasticXSMutex);
#endif
  }

  // it is possible re-initialisation for the new run
  if(isMaster) {

    // check environment variable 
    // Build the complete string identifying the file with the data set
    char* path = getenv("G4NEUTRONXSDATA");

    G4DynamicParticle* dynParticle = 
      new G4DynamicParticle(G4Neutron::Neutron(),G4ThreeVector(1,0,0),1);

    // Access to elements
    const G4ElementTable* theElmTable = G4Element::GetElementTable();
    size_t numOfElm = G4Element::GetNumberOfElements();
    for(size_t i=0; i<numOfElm; ++i) {
      G4int Z = ((*theElmTable)[i])->GetZasInt();
      if(Z >= MAXZINEL) { Z = MAXZINEL-1; }
      //G4cout << "Z= " << Z << G4endl;
      // Initialisation 
      if(!(data->GetElementData(Z))) { 
  Initialise(Z, dynParticle, path); 
      }
    }
    delete dynParticle;
  }
}

void 
G4NeutronInelasticXS::Initialise(G4int Z, G4DynamicParticle* dp, 
         const char* p)
{
  if(data->GetElementData(Z) || Z < 1 || Z >= MAXZINEL) { return; }
  const char* path = p;
  if(!p) {
    // check environment variable 
    // Build the complete string identifying the file with the data set
    path = getenv("G4NEUTRONXSDATA");
    if (!path) {
      G4Exception("G4NeutronInelasticXS::Initialise(..)","had013",
      FatalException,
                  "Environment variable G4NEUTRONXSDATA is not defined");
      return;
    }
  }
  // upload element data 
  std::ostringstream ost;
  ost << path << "/neutron/inel" << Z ;
  G4PhysicsVector* v = RetrieveVector(ost, true);
  data->InitialiseForElement(Z, v);
  /*
  G4cout << "G4NeutronInelasticXS::Initialise for Z= " << Z 
   << " A= " << Amean << "  Amin= " << amin[Z] 
   << "  Amax= " << amax[Z] << G4endl;
  */
  // upload isotope data
  if(amin[Z] > 0) {
    size_t nmax = (size_t)(amax[Z]-amin[Z]+1);
    data->InitialiseForComponent(Z, nmax);

    for(G4int A=amin[Z]; A<=amax[Z]; ++A) {
      std::ostringstream ost1;
      ost1 << path << "/neutron/inel" << Z << "_" << A;
      G4PhysicsVector* v1 = RetrieveVector(ost1, false);
      data->AddComponent(Z, A, v1); 
    }
  }

  // smooth transition 
  G4double sig1 = (*v)[v->GetVectorLength()-1];
  dp->SetKineticEnergy(v->GetMaxEnergy());
  G4double sig2 = 0.0;
  if(1 == Z) {
    fNucleon->GetHadronNucleonXscPDG(dp, proton);
    sig2 = fNucleon->GetInelasticHadronNucleonXsc();
  } else {
    G4int Amean = 
      G4lrint(G4NistManager::Instance()->GetAtomicMassAmu(Z));
    ggXsection->GetIsoCrossSection(dp, Z, Amean);
    sig2 = ggXsection->GetInelasticGlauberGribovXsc();
  }
  if(sig2 > 0.) { coeff[Z] = sig1/sig2; } 
}

G4PhysicsVector* 
G4NeutronInelasticXS::RetrieveVector(std::ostringstream& ost, G4bool warn)
{
  G4PhysicsLogVector* v = nullptr;
  std::ifstream filein(ost.str().c_str());
  if (!(filein)) {
    if(warn) { 
      G4ExceptionDescription ed;
      ed << "Data file <" << ost.str().c_str()
   << "> is not opened!";
      G4Exception("G4NeutronInelasticXS::RetrieveVector(..)","had014",
      FatalException, ed, "Check G4NEUTRONXSDATA");
    }
  } else {
    if(verboseLevel > 1) {
      G4cout << "File " << ost.str() 
       << " is opened by G4NeutronInelasticXS" << G4endl;
    }
    // retrieve data from DB
    v = new G4PhysicsLogVector();
    if(!v->Retrieve(filein, true)) {
      G4ExceptionDescription ed;
      ed << "Data file <" << ost.str().c_str()
   << "> is not retrieved!";
      G4Exception("G4NeutronInelasticXS::RetrieveVector(..)","had015",
      FatalException, ed, "Check G4NEUTRONXSDATA");
    }
  }
  return v;
}