G4ANuElNucleusCcModel Class Reference

#include <G4ANuElNucleusCcModel.hh>

Inheritance diagram for G4ANuElNucleusCcModel:

Public Member Functions
	G4ANuElNucleusCcModel (const G4String &name="ANuElNuclCcModel")
virtual	~G4ANuElNucleusCcModel ()
virtual void	InitialiseModel ()
virtual G4bool	IsApplicable (const G4HadProjectile &aTrack, G4Nucleus &targetNucleus)
virtual G4HadFinalState *	ApplyYourself (const G4HadProjectile &aTrack, G4Nucleus &targetNucleus)
void	SampleLVkr (const G4HadProjectile &aTrack, G4Nucleus &targetNucleus)
G4double	GetMinNuElEnergy ()
G4double	ThresholdEnergy (G4double mI, G4double mF, G4double mP)
virtual void	ModelDescription (std::ostream &) const
Public Member Functions inherited from G4NeutrinoNucleusModel
	G4NeutrinoNucleusModel (const G4String &name="neutrino-nucleus")
virtual	~G4NeutrinoNucleusModel ()
G4double	SampleXkr (G4double energy)
G4double	GetXkr (G4int iEnergy, G4double prob)
G4double	SampleQkr (G4double energy, G4double xx)
G4double	GetQkr (G4int iE, G4int jX, G4double prob)
void	ClusterDecay (G4LorentzVector &lvX, G4int qX)
void	MesonDecay (G4LorentzVector &lvX, G4int qX)
void	FinalBarion (G4LorentzVector &lvB, G4int qB, G4int pdgB)
void	RecoilDeexcitation (G4Fragment &fragment)
void	FinalMeson (G4LorentzVector &lvM, G4int qM, G4int pdgM)
void	CoherentPion (G4LorentzVector &lvP, G4int pdgP, G4Nucleus &targetNucleus)
void	SetCutEnergy (G4double ec)
G4double	GetCutEnergy ()
G4double	GetNuEnergy ()
G4double	GetQtransfer ()
G4double	GetQ2 ()
G4double	GetXsample ()
G4int	GetPDGencoding ()
G4bool	GetCascade ()
G4bool	GetString ()
G4double	GetCosTheta ()
G4double	GetEmu ()
G4double	GetEx ()
G4double	GetMuMass ()
G4double	GetW2 ()
G4double	GetM1 ()
G4double	GetMr ()
G4double	GetTr ()
G4double	GetDp ()
G4bool	GetfBreak ()
G4bool	GetfCascade ()
G4bool	GetfString ()
G4LorentzVector	GetLVl ()
G4LorentzVector	GetLVh ()
G4LorentzVector	GetLVt ()
G4LorentzVector	GetLVcpi ()
G4double	GetMinNuMuEnergy ()
G4double	ThresholdEnergy (G4double mI, G4double mF, G4double mP)
G4double	GetQEratioA ()
void	SetQEratioA (G4double qea)
G4double	FinalMomentum (G4double mI, G4double mF, G4double mP, G4LorentzVector lvX)
G4double	FermiMomentum (G4Nucleus &targetNucleus)
G4double	NucleonMomentum (G4Nucleus &targetNucleus)
G4double	GetEx (G4int A, G4bool fP)
G4double	GgSampleNM (G4Nucleus &nucl)
G4int	GetEnergyIndex (G4double energy)
G4double	GetNuMuQeTotRat (G4int index, G4double energy)
G4int	GetOnePionIndex (G4double energy)
G4double	GetNuMuOnePionProb (G4int index, G4double energy)
G4double	CalculateQEratioA (G4int Z, G4int A, G4double energy, G4int nepdg)
Public Member Functions inherited from G4HadronicInteraction
	G4HadronicInteraction (const G4String &modelName="HadronicModel")
virtual	~G4HadronicInteraction ()
virtual G4double	SampleInvariantT (const G4ParticleDefinition *p, G4double plab, G4int Z, G4int A)
G4double	GetMinEnergy () const
G4double	GetMinEnergy (const G4Material *aMaterial, const G4Element *anElement) const
void	SetMinEnergy (G4double anEnergy)
void	SetMinEnergy (G4double anEnergy, const G4Element *anElement)
void	SetMinEnergy (G4double anEnergy, const G4Material *aMaterial)
G4double	GetMaxEnergy () const
G4double	GetMaxEnergy (const G4Material *aMaterial, const G4Element *anElement) const
void	SetMaxEnergy (const G4double anEnergy)
void	SetMaxEnergy (G4double anEnergy, const G4Element *anElement)
void	SetMaxEnergy (G4double anEnergy, const G4Material *aMaterial)
G4int	GetVerboseLevel () const
void	SetVerboseLevel (G4int value)
const G4String &	GetModelName () const
void	DeActivateFor (const G4Material *aMaterial)
void	ActivateFor (const G4Material *aMaterial)
void	DeActivateFor (const G4Element *anElement)
void	ActivateFor (const G4Element *anElement)
G4bool	IsBlocked (const G4Material *aMaterial) const
G4bool	IsBlocked (const G4Element *anElement) const
void	SetRecoilEnergyThreshold (G4double val)
G4double	GetRecoilEnergyThreshold () const
virtual const std::pair< G4double, G4double >	GetFatalEnergyCheckLevels () const
virtual std::pair< G4double, G4double >	GetEnergyMomentumCheckLevels () const
void	SetEnergyMomentumCheckLevels (G4double relativeLevel, G4double absoluteLevel)
virtual void	BuildPhysicsTable (const G4ParticleDefinition &)
	G4HadronicInteraction (const G4HadronicInteraction &right)=delete
const G4HadronicInteraction &	operator= (const G4HadronicInteraction &right)=delete
G4bool	operator== (const G4HadronicInteraction &right) const =delete
G4bool	operator!= (const G4HadronicInteraction &right) const =delete

Additional Inherited Members
Protected Member Functions inherited from G4HadronicInteraction
void	SetModelName (const G4String &nam)
G4bool	IsBlocked () const
void	Block ()
Protected Attributes inherited from G4NeutrinoNucleusModel
G4ParticleDefinition *	theMuonMinus
G4ParticleDefinition *	theMuonPlus
G4double	fSin2tW
G4double	fCutEnergy
G4int	fNbin
G4int	fIndex
G4int	fEindex
G4int	fXindex
G4int	fQindex
G4int	fOnePionIndex
G4int	fPDGencoding
G4bool	fCascade
G4bool	fString
G4bool	fProton
G4bool	f2p2h
G4bool	fBreak
G4double	fNuEnergy
G4double	fQ2
G4double	fQtransfer
G4double	fXsample
G4double	fM1
G4double	fM2
G4double	fMt
G4double	fMu
G4double	fW2
G4double	fMpi
G4double	fW2pi
G4double	fMinNuEnergy
G4double	fDp
G4double	fTr
G4double	fEmu
G4double	fEmuPi
G4double	fEx
G4double	fMr
G4double	fCosTheta
G4double	fCosThetaPi
G4double	fQEratioA
G4LorentzVector	fLVh
G4LorentzVector	fLVl
G4LorentzVector	fLVt
G4LorentzVector	fLVcpi
G4GeneratorPrecompoundInterface *	fPrecoInterface
G4PreCompoundModel *	fPreCompound
G4ExcitationHandler *	fDeExcitation
G4Nucleus *	fRecoil
G4int	fSecID
Protected Attributes inherited from G4HadronicInteraction
G4HadFinalState	theParticleChange
G4int	verboseLevel
G4double	theMinEnergy
G4double	theMaxEnergy
G4bool	isBlocked
Static Protected Attributes inherited from G4NeutrinoNucleusModel
static const G4int	fResNumber = 6
static const G4double	fResMass [6]
static const G4int	fClustNumber = 4
static const G4double	fMesMass [4] = {1260., 980., 770., 139.57}
static const G4int	fMesPDG [4] = {20213, 9000211, 213, 211}
static const G4double	fBarMass [4] = {1700., 1600., 1232., 939.57}
static const G4int	fBarPDG [4] = {12224, 32224, 2224, 2212}
static const G4double	fNuMuResQ [50][50]
static const G4double	fNuMuEnergy [50]
static const G4double	fNuMuQeTotRat [50]
static const G4double	fOnePionEnergy [58]
static const G4double	fOnePionProb [58]
static const G4double	fNuMuEnergyLogVector [50]
static G4double	fNuMuXarrayKR [50][51] = {{1.0}}
static G4double	fNuMuXdistrKR [50][50] = {{1.0}}
static G4double	fNuMuQarrayKR [50][51][51] = {{{1.0}}}
static G4double	fNuMuQdistrKR [50][51][50] = {{{1.0}}}
static const G4double	fQEnergy [50]
static const G4double	fANeMuQEratio [50]
static const G4double	fNeMuQEratio [50]

Detailed Description

Definition at line 55 of file G4ANuElNucleusCcModel.hh.

Constructor & Destructor Documentation

G4ANuElNucleusCcModel()

G4ANuElNucleusCcModel::G4ANuElNucleusCcModel

(

const G4String &

name = "ANuElNuclCcModel"

)

Definition at line 94 of file G4ANuElNucleusCcModel.cc.

  : G4NeutrinoNucleusModel(name)
{
  thePositron = G4Positron::Positron();
  fData = fMaster = false;
  fMel = electron_mass_c2;
  InitialiseModel();  
}

~G4ANuElNucleusCcModel()

G4ANuElNucleusCcModel::~G4ANuElNucleusCcModel ( )

virtual

Definition at line 104 of file G4ANuElNucleusCcModel.cc.

{}

Member Function Documentation

ApplyYourself()

G4HadFinalState * G4ANuElNucleusCcModel::ApplyYourself ( const G4HadProjectile & aTrack, G4Nucleus & targetNucleus )

virtual

Implements G4NeutrinoNucleusModel.

Definition at line 240 of file G4ANuElNucleusCcModel.cc.

{
  theParticleChange.Clear();
  fProton = f2p2h = fBreak = false;
  fCascade = fString  = false;
  fLVh = fLVl = fLVt = fLVcpi = G4LorentzVector(0.,0.,0.,0.);
 
  const G4HadProjectile* aParticle = &aTrack;
  G4double energy = aParticle->GetTotalEnergy();
 
  G4String pName  = aParticle->GetDefinition()->GetParticleName();
 
  if( energy < fMinNuEnergy ) 
  {
    theParticleChange.SetEnergyChange(energy);
    theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
    return &theParticleChange;
  }
 
  SampleLVkr( aTrack, targetNucleus);
 
  if( fBreak == true || fEmu < fMel ) // ~5*10^-6
  {
    // G4cout<<"ni, ";
    theParticleChange.SetEnergyChange(energy);
    theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
    return &theParticleChange;
  }
 
  // LVs of initial state
 
  G4LorentzVector lvp1 = aParticle->Get4Momentum();
  G4LorentzVector lvt1( 0., 0., 0., fM1 );
  G4double mPip = G4ParticleTable::GetParticleTable()->FindParticle(211)->GetPDGMass();
 
  // 1-pi by fQtransfer && nu-energy
  G4LorentzVector lvpip1( 0., 0., 0., mPip );
  G4LorentzVector lvsum, lv2, lvX;
  G4ThreeVector eP;
  G4double cost(1.), sint(0.), phi(0.), muMom(0.), massX2(0.), massX(0.), massR(0.), eCut(0.);
  G4DynamicParticle* aLept = nullptr; // lepton lv
 
  G4int Z = targetNucleus.GetZ_asInt();
  G4int A = targetNucleus.GetA_asInt();
  G4double  mTarg = targetNucleus.AtomicMass(A,Z);
  G4int pdgP(0), qB(0);
  // G4double mSum = G4ParticleTable::GetParticleTable()->FindParticle(2212)->GetPDGMass() + mPip;
 
  G4int iPi     = GetOnePionIndex(energy);
  G4double p1pi = GetNuMuOnePionProb( iPi, energy);
 
  if( p1pi > G4UniformRand()  && fCosTheta > 0.9  ) // && fQtransfer < 0.95*GeV ) // mu- & coherent pion + nucleus
  {
    // lvsum = lvp1 + lvpip1;
    lvsum = lvp1 + lvt1;
    // cost = fCosThetaPi;
    cost = fCosTheta;
    sint = std::sqrt( (1.0 - cost)*(1.0 + cost) );
    phi  = G4UniformRand()*CLHEP::twopi;
    eP   = G4ThreeVector( sint*std::cos(phi), sint*std::sin(phi), cost );
 
    // muMom = sqrt(fEmuPi*fEmuPi-fMel*fMel);
    muMom = sqrt(fEmu*fEmu-fMel*fMel);
 
    eP *= muMom;
 
    // lv2 = G4LorentzVector( eP, fEmuPi );
    // lv2 = G4LorentzVector( eP, fEmu );
    lv2 = fLVl;
 
    // lvX = lvsum - lv2;
    lvX = fLVh;
    massX2 = lvX.m2();
    massX = lvX.m();
    massR = fLVt.m();
    
    if ( massX2 <= 0. ) // vmg: very rarely ~ (1-4)e-6 due to big Q2/x, to be improved
    {
      fCascade = true;
      theParticleChange.SetEnergyChange(energy);
      theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
      return &theParticleChange;
    }
    fW2 = massX2;
 
    if(  pName == "anti_nu_e" )         aLept = new G4DynamicParticle( thePositron, lv2 );  
    else
    {
      theParticleChange.SetEnergyChange(energy);
      theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
      return &theParticleChange;
    }
    if( pName == "anti_nu_e" ) pdgP =  211;
    // else                   pdgP = -211;
    // eCut = fMpi + 0.5*(fMpi*fMpi-massX2)/mTarg; // massX -> fMpi
 
    if( A > 1 )
    {
      eCut = (fMpi + mTarg)*(fMpi + mTarg) - (massX + massR)*(massX + massR);
      eCut /= 2.*massR;
      eCut += massX;
    }
    else  eCut = fM1 + fMpi;
 
    if ( lvX.e() > eCut ) // && sqrt( GetW2() ) < 1.4*GeV ) // 
    {
      CoherentPion( lvX, pdgP, targetNucleus);
    }
    else
    {
      fCascade = true;
      theParticleChange.SetEnergyChange(energy);
      theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
      return &theParticleChange;
    } 
    theParticleChange.AddSecondary( aLept, fSecID );
 
    return &theParticleChange;
  }
  else // lepton part in lab
  { 
    lvsum = lvp1 + lvt1;
    cost = fCosTheta;
    sint = std::sqrt( (1.0 - cost)*(1.0 + cost) );
    phi  = G4UniformRand()*CLHEP::twopi;
    eP   = G4ThreeVector( sint*std::cos(phi), sint*std::sin(phi), cost );
 
    muMom = sqrt(fEmu*fEmu-fMel*fMel);
 
    eP *= muMom;
 
    lv2 = G4LorentzVector( eP, fEmu );
    lv2 = fLVl;
    lvX = lvsum - lv2;
    lvX = fLVh;
    massX2 = lvX.m2();
 
    if ( massX2 <= 0. ) // vmg: very rarely ~ (1-4)e-6 due to big Q2/x, to be improved
    {
      fCascade = true;
      theParticleChange.SetEnergyChange(energy);
      theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
      return &theParticleChange;
    }
    fW2 = massX2;
 
    if(  pName == "anti_nu_e" )         aLept = new G4DynamicParticle( thePositron, lv2 );  
    else
    {
      theParticleChange.SetEnergyChange(energy);
      theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
      return &theParticleChange;
    }
    theParticleChange.AddSecondary( aLept, fSecID );
  }
 
  // hadron part
 
  fRecoil  = nullptr;
  
  if( A == 1 )
  {
    if( pName == "anti_nu_e" ) qB = 2;
    // else                   qB = 0;
 
    // if( G4UniformRand() > 0.1 ) //  > 0.9999 ) // > 0.0001 ) //
    {
      ClusterDecay( lvX, qB );
    }
    return &theParticleChange;
  }
    /*
    // else
    {
      if( pName == "nu_mu" ) pdgP =  211;
      else                   pdgP = -211;
 
 
      if ( fQtransfer < 0.95*GeV ) // < 0.35*GeV ) //
      {
    if( lvX.m() > mSum ) CoherentPion( lvX, pdgP, targetNucleus);
      }
    }
    return &theParticleChange;
  }
  */
  G4Nucleus recoil;
  G4double ratio = G4double(Z)/G4double(A);
 
  if( ratio > G4UniformRand() ) // proton is excited
  {
    fProton = true;
    recoil = G4Nucleus(A-1,Z-1);
    fRecoil = &recoil;
    if( pName == "anti_nu_e" ) // (++) state -> p + pi+
    { 
      fMt = G4ParticleTable::GetParticleTable()->FindParticle(2212)->GetPDGMass()
          + G4ParticleTable::GetParticleTable()->FindParticle(211)->GetPDGMass();
    }
    else // (0) state -> p + pi-, n + pi0
    {
      // fMt = G4ParticleTable::GetParticleTable()->FindParticle(2212)->GetPDGMass()
      //     + G4ParticleTable::GetParticleTable()->FindParticle(-211)->GetPDGMass();
    } 
  }
  else // excited neutron
  {
    fProton = false;
    recoil = G4Nucleus(A-1,Z);
    fRecoil = &recoil;
    if( pName == "anti_nu_e" ) // (+) state -> n + pi+
    {      
      fMt = G4ParticleTable::GetParticleTable()->FindParticle(2112)->GetPDGMass()
          + G4ParticleTable::GetParticleTable()->FindParticle(211)->GetPDGMass();
    }
    else // (-) state -> n + pi-, // n + pi0
    {
      // fMt = G4ParticleTable::GetParticleTable()->FindParticle(2112)->GetPDGMass()
      //     + G4ParticleTable::GetParticleTable()->FindParticle(-211)->GetPDGMass();
    } 
  }
  // G4int       index = GetEnergyIndex(energy);
  G4int nepdg = aParticle->GetDefinition()->GetPDGEncoding();
 
  G4double qeTotRat; //  = GetNuMuQeTotRat(index, energy);
  qeTotRat = CalculateQEratioA( Z, A, energy, nepdg);
 
  G4ThreeVector dX = (lvX.vect()).unit();
  G4double eX   = lvX.e();  // excited nucleon
  G4double mX   = sqrt(massX2);
  // G4double pX   = sqrt( eX*eX - mX*mX );
  // G4double sumE = eX + rM;
 
  if( qeTotRat > G4UniformRand() || mX <= fMt ) // || eX <= 1232.*MeV) // QE
  {  
    fString = false;
 
    G4double rM;
    if( fProton ) 
    {  
      fPDGencoding = 2212;
      fMr =  proton_mass_c2;
      recoil = G4Nucleus(A-1,Z-1);
      fRecoil = &recoil;
      rM = recoil.AtomicMass(A-1,Z-1);
    } 
    else 
    {  
      fPDGencoding = 2112;
      fMr =   G4ParticleTable::GetParticleTable()->
    FindParticle(fPDGencoding)->GetPDGMass(); // 939.5654133*MeV;
      recoil = G4Nucleus(A-1,Z);
      fRecoil = &recoil;
      rM = recoil.AtomicMass(A-1,Z);
    } 
    // sumE = eX + rM;   
    G4double eTh = fMr + 0.5*(fMr*fMr - mX*mX)/rM;
 
    if( eX <= eTh ) // vmg, very rarely out of kinematics
    {
      fString = true;
      theParticleChange.SetEnergyChange(energy);
      theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
      return &theParticleChange;
    }
    // FinalBarion( fLVh, 0, fPDGencoding ); // p(n)+deexcited recoil
    FinalBarion( lvX, 0, fPDGencoding ); // p(n)+deexcited recoil
  }
  else // if ( eX < 9500000.*GeV ) // <  25.*GeV) // < 95.*GeV ) // < 2.5*GeV ) //cluster decay
  {  
    if     (  fProton && pName == "anti_nu_e" )      qB =  2;
    else if( !fProton && pName == "anti_nu_e" )      qB =  1;
 
    ClusterDecay( lvX, qB );
  }
  return &theParticleChange;
}

GetMinNuElEnergy()

G4double G4ANuElNucleusCcModel::GetMinNuElEnergy ( )

inline

Definition at line 76 of file G4ANuElNucleusCcModel.hh.

{ return fMel + 0.5*fMel*fMel/fM1 + 0.05*CLHEP::MeV; }; // kinematics + accuracy for sqrts

Referenced by IsApplicable().

InitialiseModel()

void G4ANuElNucleusCcModel::InitialiseModel ( )

virtual

Reimplemented from G4HadronicInteraction.

Definition at line 121 of file G4ANuElNucleusCcModel.cc.

{
  G4String pName  = "anti_nu_e";
  
  G4int nSize(0), i(0), j(0), k(0);
 
  if(!fData)
  { 
#ifdef G4MULTITHREADED
    G4MUTEXLOCK(&numuNucleusModel);
    if(!fData)
    { 
#endif     
      fMaster = true;
#ifdef G4MULTITHREADED
    }
    G4MUTEXUNLOCK(&numuNucleusModel);
#endif
  }
  
  if(fMaster)
  {  
    const char* path = G4FindDataDir("G4PARTICLEXSDATA");
    std::ostringstream ost1, ost2, ost3, ost4;
    ost1 << path << "/" << "neutrino" << "/" << pName << "/xarraycckr";
 
    std::ifstream filein1( ost1.str().c_str() );
 
    // filein.open("$PARTICLEXSDATA/");
 
    filein1>>nSize;
 
    for( k = 0; k < fNbin; ++k )
    {
      for( i = 0; i <= fNbin; ++i )
      {
        filein1 >> fNuMuXarrayKR[k][i];
        // G4cout<< fNuMuXarrayKR[k][i] << "  ";
      }
    }
    // G4cout<<G4endl<<G4endl;
 
    ost2 << path << "/" << "neutrino" << "/" << pName << "/xdistrcckr";
    std::ifstream  filein2( ost2.str().c_str() );
 
    filein2>>nSize;
 
    for( k = 0; k < fNbin; ++k )
    {
      for( i = 0; i < fNbin; ++i )
      {
        filein2 >> fNuMuXdistrKR[k][i];
        // G4cout<< fNuMuXdistrKR[k][i] << "  ";
      }
    }
    // G4cout<<G4endl<<G4endl;
 
    ost3 << path << "/" << "neutrino" << "/" << pName << "/q2arraycckr";
    std::ifstream  filein3( ost3.str().c_str() );
 
    filein3>>nSize;
 
    for( k = 0; k < fNbin; ++k )
    {
      for( i = 0; i <= fNbin; ++i )
      {
        for( j = 0; j <= fNbin; ++j )
        {
          filein3 >> fNuMuQarrayKR[k][i][j];
          // G4cout<< fNuMuQarrayKR[k][i][j] << "  ";
        }
      }
    }
    // G4cout<<G4endl<<G4endl;
 
    ost4 << path << "/" << "neutrino" << "/" << pName << "/q2distrcckr";
    std::ifstream  filein4( ost4.str().c_str() );
 
    filein4>>nSize;
 
    for( k = 0; k < fNbin; ++k )
    {
      for( i = 0; i <= fNbin; ++i )
      {
        for( j = 0; j < fNbin; ++j )
        {
          filein4 >> fNuMuQdistrKR[k][i][j];
          // G4cout<< fNuMuQdistrKR[k][i][j] << "  ";
        }
      }
    }
    fData = true;
  }
}

Referenced by G4ANuElNucleusCcModel().

IsApplicable()

G4bool G4ANuElNucleusCcModel::IsApplicable ( const G4HadProjectile & aTrack, G4Nucleus & targetNucleus )

virtual

Reimplemented from G4NeutrinoNucleusModel.

Definition at line 218 of file G4ANuElNucleusCcModel.cc.

{
  G4bool result  = false;
  G4String pName = aPart.GetDefinition()->GetParticleName();
  G4double energy = aPart.GetTotalEnergy();
  fMinNuEnergy = GetMinNuElEnergy();
  
  if(  pName == "anti_nu_e"    
        &&
        energy > fMinNuEnergy                                )
  {
    result = true;
  }
 
  return result;
}

ModelDescription()

void G4ANuElNucleusCcModel::ModelDescription ( std::ostream & outFile ) const

virtual

Reimplemented from G4NeutrinoNucleusModel.

Definition at line 108 of file G4ANuElNucleusCcModel.cc.

{
 
    outFile << "G4ANuElNucleusCcModel is a neutrino-nucleus (charge current)  scattering\n"
            << "model which uses the standard model \n"
            << "transfer parameterization.  The model is fully relativistic\n";
 
}

SampleLVkr()

void G4ANuElNucleusCcModel::SampleLVkr	(	const G4HadProjectile &	aTrack,
		G4Nucleus &	targetNucleus )

Definition at line 528 of file G4ANuElNucleusCcModel.cc.

{
  fBreak = false;
  G4int A = targetNucleus.GetA_asInt(), iTer(0), iTerMax(100); 
  G4int Z = targetNucleus.GetZ_asInt(); 
  G4double e3(0.), pMu2(0.), pX2(0.), nMom(0.), rM(0.), hM(0.), tM = targetNucleus.AtomicMass(A,Z);
  G4double Ex(0.), ei(0.), nm2(0.);
  G4double cost(1.), sint(0.), phi(0.), muMom(0.); 
  G4ThreeVector eP, bst;
  const G4HadProjectile* aParticle = &aTrack;
  G4LorentzVector lvp1 = aParticle->Get4Momentum();
 
  if( A == 1 ) // hydrogen, no Fermi motion ???
  {
    fNuEnergy = aParticle->GetTotalEnergy();
    iTer = 0;
 
    do
    {
      fXsample = SampleXkr(fNuEnergy);
      fQtransfer = SampleQkr(fNuEnergy, fXsample);
      fQ2 = fQtransfer*fQtransfer;
 
     if( fXsample > 0. )
      {
        fW2 = fM1*fM1 - fQ2 + fQ2/fXsample; // sample excited hadron mass
        fEmu = fNuEnergy - fQ2/2./fM1/fXsample;
      }
      else
      {
        fW2 = fM1*fM1;
        fEmu = fNuEnergy;
      }
      e3 = fNuEnergy + fM1 - fEmu;
 
      if( e3 < sqrt(fW2) )  G4cout<<"energyX = "<<e3/GeV<<", fW = "<<sqrt(fW2)/GeV<<G4endl;
    
      pMu2 = fEmu*fEmu - fMel*fMel;
 
      if(pMu2 < 0.) { fBreak = true; return; }
 
      pX2  = e3*e3 - fW2;
 
      fCosTheta  = fNuEnergy*fNuEnergy  + pMu2 - pX2;
      fCosTheta /= 2.*fNuEnergy*sqrt(pMu2);
      iTer++;
    }
    while( ( abs(fCosTheta) > 1. || fEmu < fMel ) && iTer < iTerMax );
 
    if( iTer >= iTerMax ) { fBreak = true; return; }
 
    if( abs(fCosTheta) > 1.) // vmg: due to big Q2/x values. To be improved ...
    { 
      G4cout<<"H2: fCosTheta = "<<fCosTheta<<", fEmu = "<<fEmu<<G4endl;
      // fCosTheta = -1. + 2.*G4UniformRand(); 
      if(fCosTheta < -1.) fCosTheta = -1.;
      if(fCosTheta >  1.) fCosTheta =  1.;
    }
    // LVs
 
    G4LorentzVector lvt1  = G4LorentzVector( 0., 0., 0., fM1 );
    G4LorentzVector lvsum = lvp1 + lvt1;
 
    cost = fCosTheta;
    sint = std::sqrt( (1.0 - cost)*(1.0 + cost) );
    phi  = G4UniformRand()*CLHEP::twopi;
    eP   = G4ThreeVector( sint*std::cos(phi), sint*std::sin(phi), cost );
    muMom = sqrt(fEmu*fEmu-fMel*fMel);
    eP *= muMom;
    fLVl = G4LorentzVector( eP, fEmu );
 
    fLVh = lvsum - fLVl;
    fLVt = G4LorentzVector( 0., 0., 0., 0. ); // no recoil
  }
  else // Fermi motion, Q2 in nucleon rest frame
  {
    G4Nucleus recoil1( A-1, Z );
    rM = recoil1.AtomicMass(A-1,Z);   
    do
    {
      // nMom = NucleonMomentumBR( targetNucleus ); // BR
      nMom = GgSampleNM( targetNucleus ); // Gg
      Ex = GetEx(A-1, fProton);
      ei = tM - sqrt( (rM + Ex)*(rM + Ex) + nMom*nMom );
      //   ei = 0.5*( tM - s2M - 2*eX );
    
      nm2 = ei*ei - nMom*nMom;
      iTer++;
    }
    while( nm2 < 0. && iTer < iTerMax ); 
 
    if( iTer >= iTerMax ) { fBreak = true; return; }
    
    G4ThreeVector nMomDir = nMom*G4RandomDirection();
 
    if( !f2p2h || A < 3 ) // 1p1h
    {
      // hM = tM - rM;
 
      fLVt = G4LorentzVector( -nMomDir, sqrt( (rM + Ex)*(rM + Ex) + nMom*nMom ) ); // rM ); //
      fLVh = G4LorentzVector(  nMomDir, ei ); // hM); //
    }
    else // 2p2h
    {
      G4Nucleus recoil(A-2,Z-1);
      rM = recoil.AtomicMass(A-2,Z-1)+sqrt(nMom*nMom+fM1*fM1);
      hM = tM - rM;
 
      fLVt = G4LorentzVector( nMomDir, sqrt( rM*rM+nMom*nMom ) );
      fLVh = G4LorentzVector(-nMomDir, sqrt( hM*hM+nMom*nMom )  ); 
    }
    // G4cout<<hM<<", ";
    // bst = fLVh.boostVector();
 
    // lvp1.boost(-bst); // -> nucleon rest system, where Q2 transfer is ???
 
    fNuEnergy  = lvp1.e();
    // G4double mN = fLVh.m(); // better mN = fM1 !? vmg
    iTer = 0;
 
    do // no FM!?, 5.4.20 vmg
    {
      fXsample = SampleXkr(fNuEnergy);
      fQtransfer = SampleQkr(fNuEnergy, fXsample);
      fQ2 = fQtransfer*fQtransfer;
 
      // G4double mR = mN + fM1*(A-1.)*std::exp(-2.0*fQtransfer/mN); // recoil mass in+el
 
      if( fXsample > 0. )
      {
        fW2 = fM1*fM1 - fQ2 + fQ2/fXsample; // sample excited hadron mass
 
        // fW2 = mN*mN - fQ2 + fQ2/fXsample; // sample excited hadron mass
        // fEmu = fNuEnergy - fQ2/2./mR/fXsample; // fM1->mN
 
        fEmu = fNuEnergy - fQ2/2./fM1/fXsample; // fM1->mN
      }
      else
      {
        // fW2 = mN*mN;
 
        fW2 = fM1*fM1; 
        fEmu = fNuEnergy;
      }
      // if(fEmu < 0.) G4cout<<"fEmu = "<<fEmu<<" hM = "<<hM<<G4endl;
      // e3 = fNuEnergy + mR - fEmu;
 
      e3 = fNuEnergy + fM1 - fEmu;
 
      // if( e3 < sqrt(fW2) )  G4cout<<"energyX = "<<e3/GeV<<", fW = "<<sqrt(fW2)/GeV<<G4endl;
    
      pMu2 = fEmu*fEmu - fMel*fMel;
      pX2  = e3*e3 - fW2;
 
      if(pMu2 < 0.) { fBreak = true; return; }
 
      fCosTheta  = fNuEnergy*fNuEnergy  + pMu2 - pX2;
      fCosTheta /= 2.*fNuEnergy*sqrt(pMu2);
      iTer++;
    }
    while( ( abs(fCosTheta) > 1. || fEmu < fMel ) && iTer < iTerMax );
 
    if( iTer >= iTerMax ) { fBreak = true; return; }
 
    if( abs(fCosTheta) > 1.) // vmg: due to big Q2/x values. To be improved ...
    { 
      G4cout<<"FM: fCosTheta = "<<fCosTheta<<", fEmu = "<<fEmu<<G4endl;
      // fCosTheta = -1. + 2.*G4UniformRand(); 
      if( fCosTheta < -1.) fCosTheta = -1.;
      if( fCosTheta >  1.) fCosTheta =  1.;
    }
    // LVs
    // G4LorentzVector lvt1  = G4LorentzVector( 0., 0., 0., mN ); // fM1 );
 
    G4LorentzVector lvt1  = G4LorentzVector( 0., 0., 0., fM1 ); // fM1 );
    G4LorentzVector lvsum = lvp1 + lvt1;
 
    cost = fCosTheta;
    sint = std::sqrt( (1.0 - cost)*(1.0 + cost) );
    phi  = G4UniformRand()*CLHEP::twopi;
    eP   = G4ThreeVector( sint*std::cos(phi), sint*std::sin(phi), cost );
    muMom = sqrt(fEmu*fEmu-fMel*fMel);
    eP *= muMom;
    fLVl = G4LorentzVector( eP, fEmu );
    fLVh = lvsum - fLVl;
 
    // if( fLVh.e() < mN || fLVh.m2() < 0.) { fBreak = true; return; }
 
    if( fLVh.e() < fM1 || fLVh.m2() < 0.) { fBreak = true; return; }
 
    // back to lab system
 
    // fLVl.boost(bst);
    // fLVh.boost(bst);
  }
  //G4cout<<iTer<<", "<<fBreak<<"; ";
}

Referenced by ApplyYourself().

ThresholdEnergy()

G4double G4ANuElNucleusCcModel::ThresholdEnergy ( G4double mI, G4double mF, G4double mP )

inline

Definition at line 78 of file G4ANuElNucleusCcModel.hh.

  { 
    G4double w = std::sqrt(fW2);
    return w + 0.5*( (mP+mF)*(mP+mF)-(w+mI)*(w+mI) )/mI;
  };

---

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

• G4ANuElNucleusCcModel.hh
• G4ANuElNucleusCcModel.cc