G4BGGPionInelasticXS Class Reference

#include <G4BGGPionInelasticXS.hh>

Inheritance diagram for G4BGGPionInelasticXS:

Collaboration diagram for G4BGGPionInelasticXS:

Public Member Functions
	G4BGGPionInelasticXS (const G4ParticleDefinition *)
virtual	~G4BGGPionInelasticXS ()
virtual G4bool	IsElementApplicable (const G4DynamicParticle *, G4int Z, const G4Material *mat=0)
virtual G4bool	IsIsoApplicable (const G4DynamicParticle *, G4int Z, G4int A, const G4Element *elm=0, const G4Material *mat=0)
virtual G4double	GetElementCrossSection (const G4DynamicParticle *, G4int Z, const G4Material *mat=0)
virtual G4double	GetIsoCrossSection (const G4DynamicParticle *, G4int Z, G4int A, const G4Isotope *iso=0, const G4Element *elm=0, const G4Material *mat=0)
virtual void	BuildPhysicsTable (const G4ParticleDefinition &)
virtual void	CrossSectionDescription (std::ostream &) const
Public Member Functions inherited from G4VCrossSectionDataSet
	G4VCrossSectionDataSet (const G4String &nam="")
virtual	~G4VCrossSectionDataSet ()
G4double	GetCrossSection (const G4DynamicParticle *, const G4Element *, const G4Material *mat=0)
G4double	ComputeCrossSection (const G4DynamicParticle *, const G4Element *, const G4Material *mat=0)
virtual G4Isotope *	SelectIsotope (const G4Element *, G4double kinEnergy)
virtual void	DumpPhysicsTable (const G4ParticleDefinition &)
virtual G4int	GetVerboseLevel () const
virtual void	SetVerboseLevel (G4int value)
G4double	GetMinKinEnergy () const
void	SetMinKinEnergy (G4double value)
G4double	GetMaxKinEnergy () const
void	SetMaxKinEnergy (G4double value)
const G4String &	GetName () const

Private Member Functions
G4double	CoulombFactor (G4double kinEnergy, G4int Z)
G4BGGPionInelasticXS &	operator= (const G4BGGPionInelasticXS &right)
	G4BGGPionInelasticXS (const G4BGGPionInelasticXS &)

Private Attributes
G4double	fGlauberEnergy
G4double	fLowEnergy
G4double	fSAIDHighEnergyLimit
G4double	theGlauberFac [93]
G4double	theCoulombFac [93]
G4int	theA [93]
const G4ParticleDefinition *	particle
const G4ParticleDefinition *	theProton
G4Pow *	fG4pow
G4ComponentGGHadronNucleusXsc *	fGlauber
G4UPiNuclearCrossSection *	fPion
G4HadronNucleonXsc *	fHadron
G4ComponentSAIDTotalXS *	fSAID
G4bool	isPiplus
G4bool	isInitialized

Additional Inherited Members
Protected Member Functions inherited from G4VCrossSectionDataSet
void	SetName (const G4String &)
Protected Attributes inherited from G4VCrossSectionDataSet
G4int	verboseLevel

Detailed Description

Definition at line 68 of file G4BGGPionInelasticXS.hh.

Constructor & Destructor Documentation

G4BGGPionInelasticXS() [1/2]

G4BGGPionInelasticXS::G4BGGPionInelasticXS

(

const G4ParticleDefinition *

p

)

Definition at line 56 of file G4BGGPionInelasticXS.cc.

 : G4VCrossSectionDataSet("Barashenkov-Glauber-Gribov")
{
  verboseLevel = 0;
  fGlauberEnergy = 91.*GeV;
  fLowEnergy = 20.*MeV;
  fSAIDHighEnergyLimit = 2.6*GeV;
  SetMinKinEnergy(0.0);
  SetMaxKinEnergy(100*TeV);

  for (G4int i = 0; i < 93; i++) {
    theGlauberFac[i] = 0.0;
    theCoulombFac[i] = 0.0;
    theA[i] = 1;
  }
  fPion = 0;
  fGlauber = 0;
  fHadron  = 0;
  fSAID    = 0;

  fG4pow   = G4Pow::GetInstance();

  particle = p;
  theProton= G4Proton::Proton();
  isPiplus = false;
  isInitialized = false;
}

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~G4BGGPionInelasticXS()

G4BGGPionInelasticXS::~G4BGGPionInelasticXS ( )

virtual

Definition at line 85 of file G4BGGPionInelasticXS.cc.

{
  delete fSAID;
  delete fHadron;
  delete fPion;
  delete fGlauber;
}

G4BGGPionInelasticXS() [2/2]

G4BGGPionInelasticXS::G4BGGPionInelasticXS ( const G4BGGPionInelasticXS &  )

private

Member Function Documentation

BuildPhysicsTable()

void G4BGGPionInelasticXS::BuildPhysicsTable ( const G4ParticleDefinition &  p )

virtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 184 of file G4BGGPionInelasticXS.cc.

{
  if(&p == G4PionPlus::PionPlus() || &p == G4PionMinus::PionMinus()) {
    particle = &p;
  } else {
    G4cout << "### G4BGGPionInelasticXS WARNING: is not applicable to " 
       << p.GetParticleName()
       << G4endl;
    throw G4HadronicException(__FILE__, __LINE__,
      "G4BGGPionInelasticXS::BuildPhysicsTable is used for wrong particle");
    return;
  }

  if(isInitialized) { return; }
  isInitialized = true;

  fPion    = new G4UPiNuclearCrossSection();
  fGlauber = new G4ComponentGGHadronNucleusXsc();
  fHadron  = new G4HadronNucleonXsc();
  fSAID    = new G4ComponentSAIDTotalXS();

  fPion->BuildPhysicsTable(*particle);
  fGlauber->BuildPhysicsTable(*particle);

  if(particle == G4PionPlus::PionPlus()) { isPiplus = true; }

  G4ThreeVector mom(0.0,0.0,1.0);
  G4DynamicParticle dp(particle, mom, fGlauberEnergy);

  G4NistManager* nist = G4NistManager::Instance();

  G4double csup, csdn;
  G4int A;

  if(verboseLevel > 0) {
    G4cout << "### G4BGGPionInelasticXS::Initialise for "
       << particle->GetParticleName()
       << " isPiplus: " << isPiplus
       << G4endl;
  }

  for(G4int iz=2; iz<93; iz++) {

    A = G4lrint(nist->GetAtomicMassAmu(iz));
    theA[iz] = A;

    csup = fGlauber->GetInelasticGlauberGribov(&dp, iz, A);
    csdn = fPion->GetInelasticCrossSection(&dp, iz, theA[iz]);

    theGlauberFac[iz] = csdn/csup;
    if(verboseLevel > 0) {
      G4cout << "Z= " << iz <<  "  A= " << A 
         << " factor= " << theGlauberFac[iz] << G4endl; 
    }
  }
  dp.SetKineticEnergy(fSAIDHighEnergyLimit);
  fHadron->GetHadronNucleonXscPDG(&dp, theProton);
  theCoulombFac[1] = fSAIDHighEnergyLimit*
    (fSAID->GetInelasticIsotopeCrossSection(particle,fSAIDHighEnergyLimit,1,1)
     /fHadron->GetInelasticHadronNucleonXsc() - 1);

  if(isPiplus) { 
    dp.SetKineticEnergy(2*MeV);
    for(G4int iz=2; iz<93; iz++) {
      theCoulombFac[iz] = fPion->GetInelasticCrossSection(&dp, iz, theA[iz])
    /CoulombFactor(2*MeV,iz); 
    }

  } else {
    dp.SetKineticEnergy(fLowEnergy);
    //fHadron->GetHadronNucleonXscNS(&dp, theProton);
    //theCoulombFac[1] = theGlauberFac[1]*fHadron->GetInelasticHadronNucleonXsc();
    for(G4int iz=2; iz<93; iz++) {
      theCoulombFac[iz] = fPion->GetInelasticCrossSection(&dp, iz, theA[iz]);
    }
  }
}

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CoulombFactor()

G4double G4BGGPionInelasticXS::CoulombFactor ( G4double  kinEnergy, G4int  Z  )

private

Definition at line 264 of file G4BGGPionInelasticXS.cc.

{
  G4int A = theA[Z];
  G4double res= 0.0;
  if(kinEnergy <= DBL_MIN) { return res; }
  else if(A < 2) { return kinEnergy*kinEnergy; }
  
  G4double elog = fG4pow->log10A(6.7*kinEnergy/GeV);
  G4double aa = A;

  // from G4ProtonInelasticCrossSection
  G4double ff1 = 0.70 - 0.002*aa;           // slope of the drop at medium energies.
  G4double ff2 = 1.00 + 1/aa;               // start of the slope.
  G4double ff3 = 0.8  + 18/aa - 0.002*aa;   // stephight
  res = 1.0 + ff3*(1.0 - (1.0/(1+fG4pow->expA(-8*ff1*(elog + 1.37*ff2)))));

  ff1 = 1.   - 1./aa - 0.001*aa; // slope of the rise
  ff2 = 1.17 - 2.7/aa-0.0014*aa; // start of the rise
  res /= (1 + fG4pow->expA(-8.*ff1*(elog + 2*ff2)));
  return res;  
}

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CrossSectionDescription()

void G4BGGPionInelasticXS::CrossSectionDescription ( std::ostream &  outFile ) const

virtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 289 of file G4BGGPionInelasticXS.cc.

{
  outFile << "The Barashenkov-Glauber-Gribov cross section handles inelastic\n"
          << "pion scattering from nuclei at all energies.  The Barashenkov\n"
          << "parameterization is used below 91 GeV and the Glauber-Gribov\n"
          << "parameterization is used above 91 GeV.\n";
}

GetElementCrossSection()

G4double G4BGGPionInelasticXS::GetElementCrossSection ( const G4DynamicParticle *  dp, G4int  Z, const G4Material *  mat = 0  )

virtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 115 of file G4BGGPionInelasticXS.cc.

{
  // this method should be called only for Z > 1

  G4double cross = 0.0;
  G4double ekin = dp->GetKineticEnergy();
  G4int Z = ZZ;
  if(1 == Z) {
    cross = 1.0115*GetIsoCrossSection(dp,1,1);
  } else {
    if(Z > 92) { Z = 92; }

    if(ekin <= fLowEnergy && !isPiplus) {
      cross = theCoulombFac[Z];
    } else if(ekin <= 2*MeV && isPiplus) {
      cross = theCoulombFac[Z]*CoulombFactor(ekin, Z);  
    } else if(ekin > fGlauberEnergy) {
      cross = theGlauberFac[Z]*fGlauber->GetInelasticGlauberGribov(dp, Z, theA[Z]);
    } else {
      cross = fPion->GetInelasticCrossSection(dp, Z, theA[Z]);
    }
  }
  if(verboseLevel > 1) {
    G4cout << "G4BGGPionInelasticXS::GetCrossSection  for "
       << dp->GetDefinition()->GetParticleName()
       << "  Ekin(GeV)= " << dp->GetKineticEnergy()
       << " in nucleus Z= " << Z << "  A= " << theA[Z]
       << " XS(b)= " << cross/barn 
       << G4endl;
  }
  return cross;
}

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GetIsoCrossSection()

G4double G4BGGPionInelasticXS::GetIsoCrossSection ( const G4DynamicParticle *  dp, G4int  Z, G4int  A, const G4Isotope *  iso = 0, const G4Element *  elm = 0, const G4Material *  mat = 0  )

virtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 152 of file G4BGGPionInelasticXS.cc.

{
  // this method should be called only for Z = 1

  G4double cross = 0.0;
  G4double ekin = dp->GetKineticEnergy();

  if(ekin <= fSAIDHighEnergyLimit) {
    cross = fSAID->GetInelasticIsotopeCrossSection(particle, ekin, 1, 1);
  } else {
    fHadron->GetHadronNucleonXscPDG(dp, theProton);
    cross = (theCoulombFac[1]/ekin + 1)*fHadron->GetInelasticHadronNucleonXsc();
  } 
  cross *= A;

  if(verboseLevel > 1) {
    G4cout << "G4BGGPionInelasticXS::GetCrossSection  for "
       << dp->GetDefinition()->GetParticleName()
       << "  Ekin(GeV)= " << dp->GetKineticEnergy()
       << " in nucleus Z= " << Z << "  A= " << A
       << " XS(b)= " << cross/barn 
       << G4endl;
  }
  return cross;
}

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IsElementApplicable()

G4bool G4BGGPionInelasticXS::IsElementApplicable ( const G4DynamicParticle *  , G4int  Z, const G4Material *  mat = 0  )

virtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 96 of file G4BGGPionInelasticXS.cc.

{
  return true;
}

IsIsoApplicable()

G4bool G4BGGPionInelasticXS::IsIsoApplicable ( const G4DynamicParticle *  , G4int  Z, G4int  A, const G4Element *  elm = 0, const G4Material *  mat = 0  )

virtual

Reimplemented from G4VCrossSectionDataSet.

Definition at line 104 of file G4BGGPionInelasticXS.cc.

{
  return (1 == Z && 2 >= A);
}

operator=()

G4BGGPionInelasticXS& G4BGGPionInelasticXS::operator= ( const G4BGGPionInelasticXS &  right )

private

Member Data Documentation

fG4pow

G4Pow* G4BGGPionInelasticXS::fG4pow

private

Definition at line 117 of file G4BGGPionInelasticXS.hh.

fGlauber

G4ComponentGGHadronNucleusXsc* G4BGGPionInelasticXS::fGlauber

private

Definition at line 119 of file G4BGGPionInelasticXS.hh.

fGlauberEnergy

G4double G4BGGPionInelasticXS::fGlauberEnergy

private

Definition at line 107 of file G4BGGPionInelasticXS.hh.

fHadron

G4HadronNucleonXsc* G4BGGPionInelasticXS::fHadron

private

Definition at line 121 of file G4BGGPionInelasticXS.hh.

fLowEnergy

G4double G4BGGPionInelasticXS::fLowEnergy

private

Definition at line 108 of file G4BGGPionInelasticXS.hh.

fPion

G4UPiNuclearCrossSection* G4BGGPionInelasticXS::fPion

private

Definition at line 120 of file G4BGGPionInelasticXS.hh.

fSAID

G4ComponentSAIDTotalXS* G4BGGPionInelasticXS::fSAID

private

Definition at line 122 of file G4BGGPionInelasticXS.hh.

fSAIDHighEnergyLimit

G4double G4BGGPionInelasticXS::fSAIDHighEnergyLimit

private

Definition at line 109 of file G4BGGPionInelasticXS.hh.

isInitialized

G4bool G4BGGPionInelasticXS::isInitialized

private

Definition at line 124 of file G4BGGPionInelasticXS.hh.

isPiplus

G4bool G4BGGPionInelasticXS::isPiplus

private

Definition at line 123 of file G4BGGPionInelasticXS.hh.

particle

const G4ParticleDefinition* G4BGGPionInelasticXS::particle

private

Definition at line 114 of file G4BGGPionInelasticXS.hh.

theA

G4int G4BGGPionInelasticXS::theA[93]

private

Definition at line 112 of file G4BGGPionInelasticXS.hh.

theCoulombFac

G4double G4BGGPionInelasticXS::theCoulombFac[93]

private

Definition at line 111 of file G4BGGPionInelasticXS.hh.

theGlauberFac

G4double G4BGGPionInelasticXS::theGlauberFac[93]

private

Definition at line 110 of file G4BGGPionInelasticXS.hh.

theProton

const G4ParticleDefinition* G4BGGPionInelasticXS::theProton

private

Definition at line 115 of file G4BGGPionInelasticXS.hh.

---

The documentation for this class was generated from the following files:

• G4BGGPionInelasticXS.hh
• G4BGGPionInelasticXS.cc