#include <G4DiffuseElasticV2.hh>

Inheritance diagram for G4DiffuseElasticV2:

Public Member Functions
	G4DiffuseElasticV2 ()

virtual	~G4DiffuseElasticV2 ()

virtual G4bool	IsApplicable (const G4HadProjectile &, G4Nucleus &)

void	Initialise ()

void	InitialiseOnFly (G4double Z, G4double A)

void	BuildAngleTable ()

virtual G4double	SampleInvariantT (const G4ParticleDefinition *p, G4double plab, G4int Z, G4int A)

G4double	NeutronTuniform (G4int Z)

void	SetPlabLowLimit (G4double value)

void	SetHEModelLowLimit (G4double value)

void	SetQModelLowLimit (G4double value)

void	SetLowestEnergyLimit (G4double value)

void	SetRecoilKinEnergyLimit (G4double value)

G4double	SampleTableT (const G4ParticleDefinition *aParticle, G4double p, G4double Z, G4double A)

G4double	SampleThetaCMS (const G4ParticleDefinition *aParticle, G4double p, G4double A)

G4double	SampleTableThetaCMS (const G4ParticleDefinition *aParticle, G4double p, G4double Z, G4double A)

G4double	GetScatteringAngle (G4int iMomentum, unsigned long iAngle, G4double position)

G4double	SampleThetaLab (const G4HadProjectile *aParticle, G4double tmass, G4double A)

G4double	CalculateZommerfeld (G4double beta, G4double Z1, G4double Z2)

G4double	CalculateAm (G4double momentum, G4double n, G4double Z)

G4double	CalculateNuclearRad (G4double A)

G4double	ThetaCMStoThetaLab (const G4DynamicParticle *aParticle, G4double tmass, G4double thetaCMS)

G4double	ThetaLabToThetaCMS (const G4DynamicParticle *aParticle, G4double tmass, G4double thetaLab)

G4double	BesselJzero (G4double z)

G4double	BesselJone (G4double z)

G4double	DampFactor (G4double z)

G4double	BesselOneByArg (G4double z)

G4double	GetDiffElasticSumProbA (G4double alpha)

G4double	GetIntegrandFunction (G4double theta)

G4double	GetNuclearRadius ()

Public Member Functions inherited from G4HadronElastic
	G4HadronElastic (const G4String &name="hElasticLHEP")

	~G4HadronElastic () override

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

G4double	SampleInvariantT (const G4ParticleDefinition *p, G4double plab, G4int Z, G4int A) override

G4double	GetSlopeCof (const G4int pdg)

void	SetLowestEnergyLimit (G4double value)

G4double	LowestEnergyLimit () const

G4double	ComputeMomentumCMS (const G4ParticleDefinition *p, G4double plab, G4int Z, G4int A)

void	ModelDescription (std::ostream &) const override

Public Member Functions inherited from G4HadronicInteraction
	G4HadronicInteraction (const G4String &modelName="HadronicModel")

virtual	~G4HadronicInteraction ()

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 &)

virtual void	InitialiseModel ()

	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 G4HadronElastic
G4double	pLocalTmax

G4int	secID

Protected Attributes inherited from G4HadronicInteraction
G4HadFinalState	theParticleChange

G4int	verboseLevel

G4double	theMinEnergy

G4double	theMaxEnergy

G4bool	isBlocked

Detailed Description

Definition at line 61 of file G4DiffuseElasticV2.hh.

Constructor & Destructor Documentation

◆ G4DiffuseElasticV2()

G4DiffuseElasticV2::G4DiffuseElasticV2 ( )

Definition at line 76 of file G4DiffuseElasticV2.cc.

  : G4HadronElastic("DiffuseElasticV2"), fParticle(0)
{
  SetMinEnergy( 0.01*MeV );
  SetMaxEnergy( G4HadronicParameters::Instance()->GetMaxEnergy() );
 
  verboseLevel         = 0;
  lowEnergyRecoilLimit = 100.*keV;  
  lowEnergyLimitQ      = 0.0*GeV;  
  lowEnergyLimitHE     = 0.0*GeV;  
  lowestEnergyLimit    = 0.0*keV;  
  plabLowLimit         = 20.0*MeV;
 
  theProton    = G4Proton::Proton();
  theNeutron   = G4Neutron::Neutron();
 
  fEnergyBin = 300;  // Increased from the original 200 to have no wider log-energy-bins up to 10 PeV  
  fAngleBin  = 200;
 
  fEnergyVector =  new G4PhysicsLogVector( theMinEnergy, theMaxEnergy, fEnergyBin );
 
  fEnergyAngleVector = 0;
  fEnergySumVector = 0;
  
  fParticle      = 0;
  fWaveVector    = 0.;
  fAtomicWeight  = 0.;
  fAtomicNumber  = 0.;
  fNuclearRadius = 0.;
  fBeta          = 0.;
  fZommerfeld    = 0.;
  fAm = 0.;
  fAddCoulomb = false;
}

Referenced by BuildAngleTable().

◆ ~G4DiffuseElasticV2()

G4DiffuseElasticV2::~G4DiffuseElasticV2 ( )

virtual

Definition at line 115 of file G4DiffuseElasticV2.cc.

{
  if ( fEnergyVector ) 
  {
    delete fEnergyVector;
    fEnergyVector = 0;
  }
}

Member Function Documentation

◆ BesselJone()

G4double G4DiffuseElasticV2::BesselJone ( G4double z )

inline

Definition at line 267 of file G4DiffuseElasticV2.hh.

{
  G4double modvalue, value2, fact1, fact2, arg, shift, bessel;
 
  modvalue = std::fabs(value);
 
  if ( modvalue < 8.0 ) 
  {
    value2 = value*value;
 
    fact1  = value*(72362614232.0 + value2*(-7895059235.0 
                                  + value2*( 242396853.1
                                  + value2*(-2972611.439 
                                  + value2*( 15704.48260 
                                  + value2*(-30.16036606  ) ) ) ) ) );
 
    fact2  = 144725228442.0 + value2*(2300535178.0 
                            + value2*(18583304.74
                            + value2*(99447.43394 
                            + value2*(376.9991397 
                            + value2*1.0             ) ) ) );
    bessel = fact1/fact2;
  } 
  else 
  {
    arg    = 8.0/modvalue;
 
    value2 = arg*arg;
 
    shift  = modvalue - 2.356194491;
 
    fact1  = 1.0 + value2*( 0.183105e-2 
                 + value2*(-0.3516396496e-4
                 + value2*(0.2457520174e-5 
                 + value2*(-0.240337019e-6          ) ) ) );
 
    fact2 = 0.04687499995 + value2*(-0.2002690873e-3
                          + value2*( 0.8449199096e-5
                          + value2*(-0.88228987e-6
                          + value2*0.105787412e-6       ) ) );
 
    bessel = std::sqrt( 0.636619772/modvalue)*(std::cos(shift)*fact1 - arg*std::sin(shift)*fact2);
 
    if (value < 0.0) bessel = -bessel;
  }
  return bessel;
}

Referenced by BesselOneByArg(), and GetDiffElasticSumProbA().

◆ BesselJzero()

G4double G4DiffuseElasticV2::BesselJzero ( G4double z )

inline

Definition at line 215 of file G4DiffuseElasticV2.hh.

{
  G4double modvalue, value2, fact1, fact2, arg, shift, bessel;
 
  modvalue = std::fabs(value);
 
  if ( value < 8.0 && value > -8.0 )
  {
    value2 = value*value;
 
    fact1  = 57568490574.0 + value2*(-13362590354.0 
                           + value2*( 651619640.7 
                           + value2*(-11214424.18 
                           + value2*( 77392.33017 
                           + value2*(-184.9052456   ) ) ) ) );
 
    fact2  = 57568490411.0 + value2*( 1029532985.0 
                           + value2*( 9494680.718
                           + value2*(59272.64853
                           + value2*(267.8532712 
                           + value2*1.0               ) ) ) );
 
    bessel = fact1/fact2;
  } 
  else 
  {
    arg    = 8.0/modvalue;
 
    value2 = arg*arg;
 
    shift  = modvalue-0.785398164;
 
    fact1  = 1.0 + value2*(-0.1098628627e-2 
                 + value2*(0.2734510407e-4
                 + value2*(-0.2073370639e-5 
                 + value2*0.2093887211e-6    ) ) );
 
    fact2  = -0.1562499995e-1 + value2*(0.1430488765e-3
                              + value2*(-0.6911147651e-5 
                              + value2*(0.7621095161e-6
                              - value2*0.934945152e-7    ) ) );
 
    bessel = std::sqrt(0.636619772/modvalue)*(std::cos(shift)*fact1 - arg*std::sin(shift)*fact2 );
  }
  return bessel;
}

Referenced by GetDiffElasticSumProbA().

◆ BesselOneByArg()

G4double G4DiffuseElasticV2::BesselOneByArg ( G4double z )

inline

Definition at line 342 of file G4DiffuseElasticV2.hh.

{
  G4double x2, result;
  
  if( std::fabs(x) < 0.01 )
  { 
   x     *= 0.5;
   x2     = x*x;
   result = 2. - x2 + x2*x2/6.;
  }
  else
  {
    result = BesselJone(x)/x; 
  }
  return result;
}

Referenced by GetDiffElasticSumProbA().

◆ BuildAngleTable()

void G4DiffuseElasticV2::BuildAngleTable ( )

Definition at line 435 of file G4DiffuseElasticV2.cc.

{
  G4double partMom, kinE, a = 0., z = fParticle->GetPDGCharge(), m1 = fParticle->GetPDGMass();
  G4double alpha1, alpha2, alphaMax, alphaCoulomb, delta = 0., sum = 0.;
 
  G4Integrator<G4DiffuseElasticV2,G4double(G4DiffuseElasticV2::*)(G4double)> integral;
  
  fEnergyAngleVector = new std::vector<std::vector<G4double>*>;
  fEnergySumVector = new std::vector<std::vector<G4double>*>;
  
  for( G4int i = 0; i < fEnergyBin; ++i)
  {
    kinE        = fEnergyVector->Energy(i);
    partMom     = std::sqrt( kinE*(kinE + 2*m1) );
 
    fWaveVector = partMom/hbarc;
 
    G4double kR     = fWaveVector*fNuclearRadius;
    G4double kRmax  = 18.6; // 10.6; 10.6, 18, 10.174; ~ 3 maxima of J1 or 15., 25.
    G4double kRcoul = 1.9; // 1.2; 1.4, 2.5; // on the first slope of J1
 
    alphaMax = kRmax/kR;
 
    if ( alphaMax >= CLHEP::pi ) alphaMax = CLHEP::pi;   // vmg21.10.15 
 
    alphaCoulomb = kRcoul/kR;
 
    if( z )
    {
      a           = partMom/m1;         // beta*gamma for m1
      fBeta       = a/std::sqrt(1+a*a);
      fZommerfeld = CalculateZommerfeld( fBeta, z, fAtomicNumber);
      fAm         = CalculateAm( partMom, fZommerfeld, fAtomicNumber);
      fAddCoulomb = true;
    }
 
    std::vector<G4double>* angleVector = new std::vector<G4double>(fAngleBin);
    std::vector<G4double>* sumVector = new std::vector<G4double>(fAngleBin);
 
    
    G4double delth = alphaMax/fAngleBin;
        
    sum = 0.;
 
    for(G4int j = (G4int)fAngleBin-1; j >= 0; --j)
    {
      alpha1 = delth*j;
      alpha2 = alpha1 + delth;
      
      if( fAddCoulomb && ( alpha2 < alphaCoulomb)) fAddCoulomb = false;
 
      delta = integral.Legendre10(this, &G4DiffuseElasticV2::GetIntegrandFunction, alpha1, alpha2);
 
      sum += delta;
      
      (*angleVector)[j] = alpha1;
      (*sumVector)[j] = sum; 
      
    }
    fEnergyAngleVector->push_back(angleVector);
    fEnergySumVector->push_back(sumVector);
      
  }
  return;
}

Referenced by Initialise(), and InitialiseOnFly().

◆ CalculateAm()

G4double G4DiffuseElasticV2::CalculateAm	(	G4double	momentum,
		G4double	n,
		G4double	Z )

inline

Definition at line 375 of file G4DiffuseElasticV2.hh.

{
  G4double k   = momentum/CLHEP::hbarc;
  G4double ch  = 1.13 + 3.76*n*n;
  G4double zn  = 1.77*k*(1.0/G4Pow::GetInstance()->A13(Z))*CLHEP::Bohr_radius;
  G4double zn2 = zn*zn;
  fAm          = ch/zn2;
 
  return fAm;
}

Referenced by BuildAngleTable().

◆ CalculateNuclearRad()

G4double G4DiffuseElasticV2::CalculateNuclearRad ( G4double A )

inline

Definition at line 390 of file G4DiffuseElasticV2.hh.

{
  G4double R, r0, a11, a12, a13, a2, a3;
 
  a11 = 1.26;  // 1.08, 1.16
  a12 = 1.;  // 1.08, 1.16
  a13 = 1.12;  // 1.08, 1.16
  a2 = 1.1;
  a3 = 1.;
 
  // Special rms radii for light nucleii
 
  if (A < 50.)
    {
      if     (std::abs(A-1.) < 0.5)                         return 0.89*CLHEP::fermi; // p
      else if(std::abs(A-2.) < 0.5)                         return 2.13*CLHEP::fermi; // d
      else if(  // std::abs(Z-1.) < 0.5 && 
          std::abs(A-3.) < 0.5) return 1.80*CLHEP::fermi; // t
 
      // else if(std::abs(Z-2.) < 0.5 && std::abs(A-3.) < 0.5) return 1.96CLHEP::fermi; // He3
      else if( // std::abs(Z-2.) < 0.5 && 
          std::abs(A-4.) < 0.5) return 1.68*CLHEP::fermi; // He4
 
      else if(  // std::abs(Z-3.) < 0.5
          std::abs(A-7.) < 0.5   )                         return 2.40*CLHEP::fermi; // Li7
      else if(  // std::abs(Z-4.) < 0.5 
          std::abs(A-9.) < 0.5)                         return 2.51*CLHEP::fermi; // Be9
 
      else if( 10.  < A && A <= 16. ) r0  = a11*( 1 - (1.0/G4Pow::GetInstance()->A23(A)) )*CLHEP::fermi;   // 1.08CLHEP::fermi;
      else if( 15.  < A && A <= 20. ) r0  = a12*( 1 - (1.0/G4Pow::GetInstance()->A23(A)) )*CLHEP::fermi;
      else if( 20.  < A && A <= 30. ) r0  = a13*( 1 - (1.0/G4Pow::GetInstance()->A23(A)) )*CLHEP::fermi;
      else                            r0  = a2*CLHEP::fermi;
 
      R = r0*G4Pow::GetInstance()->A13(A);
    }
  else
    {
      r0 = a3*CLHEP::fermi;
 
      R  = r0*G4Pow::GetInstance()->powA(A, 0.27);
    }
  fNuclearRadius = R;
 
  return R;
}

Referenced by Initialise(), and InitialiseOnFly().

◆ CalculateZommerfeld()

G4double G4DiffuseElasticV2::CalculateZommerfeld	(	G4double	beta,
		G4double	Z1,
		G4double	Z2 )

inline

Definition at line 364 of file G4DiffuseElasticV2.hh.

{
  fZommerfeld = CLHEP::fine_structure_const*Z1*Z2/beta;
 
  return fZommerfeld; 
}

Referenced by BuildAngleTable().

◆ DampFactor()

G4double G4DiffuseElasticV2::DampFactor ( G4double z )

inline

Definition at line 319 of file G4DiffuseElasticV2.hh.

{
  G4double df;
  G4double f2 = 2., f3 = 6., f4 = 24.; // first factorials
 
  // x *= pi;
 
  if( std::fabs(x) < 0.01 )
  { 
    df = 1./(1. + x/f2 + x*x/f3 + x*x*x/f4);
  }
  else
  {
    df = x/std::sinh(x); 
  }
  return df;
}

Referenced by GetDiffElasticSumProbA().

◆ GetDiffElasticSumProbA()

G4double G4DiffuseElasticV2::GetDiffElasticSumProbA ( G4double alpha )

Definition at line 164 of file G4DiffuseElasticV2.cc.

{
 
  G4double sigma, bzero, bzero2, bonebyarg, bonebyarg2, damp, damp2;
  G4double delta, diffuse, gamma;
  G4double e1, e2, bone, bone2;
 
  // G4double wavek = momentum/hbarc;  // wave vector
  // G4double r0    = 1.08*fermi;
  // G4double rad   = r0*G4Pow::GetInstance()->A13(A);
 
  G4double kr    = fWaveVector*fNuclearRadius; // wavek*rad;
  G4double kr2   = kr*kr;
  G4double krt   = kr*theta;
 
  bzero      = BesselJzero(krt);
  bzero2     = bzero*bzero;    
  bone       = BesselJone(krt);
  bone2      = bone*bone;
  bonebyarg  = BesselOneByArg(krt);
  bonebyarg2 = bonebyarg*bonebyarg;  
 
  if ( fParticle == theProton )
  {
    diffuse = 0.63*fermi;
    gamma   = 0.3*fermi;
    delta   = 0.1*fermi*fermi;
    e1      = 0.3*fermi;
    e2      = 0.35*fermi;
  }
  else if ( fParticle == theNeutron )
  {
    diffuse = 0.63*fermi;
    gamma   = 0.3*fermi;
    delta   = 0.1*fermi*fermi;
    e1      = 0.3*fermi;
    e2      = 0.35*fermi;
  }
  else // as proton, if were not defined 
  {
    diffuse = 0.63*fermi;
    gamma   = 0.3*fermi;
    delta   = 0.1*fermi*fermi;
    e1      = 0.3*fermi;
    e2      = 0.35*fermi;
  }
  
  G4double lambda = 15; // 15 ok
  // G4double kgamma    = fWaveVector*gamma;   // wavek*delta;
  G4double kgamma    = lambda*(1.-G4Exp(-fWaveVector*gamma/lambda));   // wavek*delta;
 
  if( fAddCoulomb )  // add Coulomb correction
  {
    G4double sinHalfTheta  = std::sin(0.5*theta); 
    G4double sinHalfTheta2 = sinHalfTheta*sinHalfTheta;
 
    kgamma += 0.5*fZommerfeld/kr/(sinHalfTheta2+fAm); // correction at J0()
  }
  
  G4double kgamma2   = kgamma*kgamma;
 
  // G4double dk2t  = delta*fWaveVector*fWaveVector*theta; // delta*wavek*wavek*theta;
  // G4double dk2t2 = dk2t*dk2t;
 
  // G4double pikdt = pi*fWaveVector*diffuse*theta;// pi*wavek*diffuse*theta;
  G4double pikdt    = lambda*(1. - G4Exp( -pi*fWaveVector*diffuse*theta/lambda ) );   // wavek*delta;
 
  damp           = DampFactor( pikdt );
  damp2          = damp*damp;
 
  G4double mode2k2 = ( e1*e1 + e2*e2 )*fWaveVector*fWaveVector;  
  G4double e2dk3t  = -2.*e2*delta*fWaveVector*fWaveVector*fWaveVector*theta;
 
  sigma  = kgamma2;
  // sigma += dk2t2;
  sigma *= bzero2;
  sigma += mode2k2*bone2; 
  sigma += e2dk3t*bzero*bone;
 
  // sigma += kr2*(1 + 8.*fZommerfeld*fZommerfeld/kr2)*bonebyarg2;  // correction at J1()/()
  sigma += kr2*bonebyarg2;  // correction at J1()/()
 
  sigma *= damp2;          // *rad*rad;
 
  return sigma;
}

Referenced by GetIntegrandFunction().

◆ GetIntegrandFunction()

G4double G4DiffuseElasticV2::GetIntegrandFunction ( G4double theta )

Definition at line 257 of file G4DiffuseElasticV2.cc.

{
  G4double result;
 
  result  = GetDiffElasticSumProbA(alpha) * 2 * CLHEP::pi * std::sin(alpha);
  
  return result;
}

Referenced by BuildAngleTable().

◆ GetNuclearRadius()

G4double G4DiffuseElasticV2::GetNuclearRadius ( )

inline

Definition at line 129 of file G4DiffuseElasticV2.hh.

129{return fNuclearRadius;};

◆ GetScatteringAngle()

G4double G4DiffuseElasticV2::GetScatteringAngle	(	G4int	iMomentum,
		unsigned long	iAngle,
		G4double	position )

Definition at line 506 of file G4DiffuseElasticV2.cc.

{
  G4double x1, x2, y1, y2, randAngle = 0;
  
  if( iAngle == 0 )
  {
    randAngle = (*(*fEnergyAngleVector)[iMomentum])[iAngle];
  }
  else
  {
    if ( iAngle >= (*fEnergyAngleVector)[iMomentum]->size() )
    {
      iAngle = (*fEnergyAngleVector)[iMomentum]->size() - 1;
    }
    
    y1 = (*(*fEnergySumVector)[iMomentum])[iAngle-1];
    y2 = (*(*fEnergySumVector)[iMomentum])[iAngle];
 
    x1 = (*(*fEnergyAngleVector)[iMomentum])[iAngle-1];
    x2 = (*(*fEnergyAngleVector)[iMomentum])[iAngle];
 
    if ( x1 == x2 )   randAngle = x2;
    else
    {
      if ( y1 == y2 ) randAngle = x1 + ( x2 - x1 )*G4UniformRand();
      else
      {
        randAngle = x1 + ( position - y1 )*( x2 - x1 )/( y2 - y1 );
      }
    }
  }
 
  return randAngle;
}

Referenced by SampleTableThetaCMS().

◆ Initialise()

void G4DiffuseElasticV2::Initialise ( )

Definition at line 128 of file G4DiffuseElasticV2.cc.

{
 
  const G4ElementTable* theElementTable = G4Element::GetElementTable();
 
  std::size_t jEl, numOfEl = G4Element::GetNumberOfElements();
 
  for( jEl = 0; jEl < numOfEl; ++jEl) // application element loop
  {
    fAtomicNumber = (*theElementTable)[jEl]->GetZ();     // atomic number
    fAtomicWeight = G4NistManager::Instance()->GetAtomicMassAmu( static_cast< G4int >( fAtomicNumber ) );
    fNuclearRadius = CalculateNuclearRad(fAtomicWeight);
 
    if( verboseLevel > 0 ) 
    {   
      G4cout<<"G4DiffuseElasticV2::Initialise() the element: "
        <<(*theElementTable)[jEl]->GetName()<<G4endl;
    }
    fElementNumberVector.push_back(fAtomicNumber);
    fElementNameVector.push_back((*theElementTable)[jEl]->GetName());
 
    BuildAngleTable();
 
    fEnergyAngleVectorBank.push_back(fEnergyAngleVector);
    fEnergySumVectorBank.push_back(fEnergySumVector);
 
  }  
  return;
}

◆ InitialiseOnFly()

void G4DiffuseElasticV2::InitialiseOnFly	(	G4double	Z,
		G4double	A )

Definition at line 408 of file G4DiffuseElasticV2.cc.

{
  fAtomicNumber  = Z;     // atomic number
  fAtomicWeight  = G4NistManager::Instance()->GetAtomicMassAmu( static_cast< G4int >( Z ) );
 
  fNuclearRadius = CalculateNuclearRad(fAtomicWeight);
 
  if( verboseLevel > 0 )    
  {
    G4cout<<"G4DiffuseElasticV2::InitialiseOnFly() the element with Z = "
      <<Z<<"; and A = "<<A<<G4endl;
  }
  fElementNumberVector.push_back(fAtomicNumber);
 
  BuildAngleTable();
 
  fEnergyAngleVectorBank.push_back(fEnergyAngleVector);
  fEnergySumVectorBank.push_back(fEnergySumVector);
  
  return;
}

Referenced by SampleTableThetaCMS().

◆ IsApplicable()

G4bool G4DiffuseElasticV2::IsApplicable	(	const G4HadProjectile &	projectile,
		G4Nucleus &	nucleus )

inlinevirtual

Reimplemented from G4HadronicInteraction.

Definition at line 170 of file G4DiffuseElasticV2.hh.

{
  if( ( projectile.GetDefinition() == G4Proton::Proton() ||
        projectile.GetDefinition() == G4Neutron::Neutron() ||
        projectile.GetDefinition() == G4PionPlus::PionPlus() ||
        projectile.GetDefinition() == G4PionMinus::PionMinus() ||
        projectile.GetDefinition() == G4KaonPlus::KaonPlus() ||
        projectile.GetDefinition() == G4KaonMinus::KaonMinus() ) &&
 
        nucleus.GetZ_asInt() >= 2 ) return true;
  else                              return false;
}

◆ NeutronTuniform()

G4double G4DiffuseElasticV2::NeutronTuniform ( G4int Z )

Definition at line 310 of file G4DiffuseElasticV2.cc.

{
  G4double elZ  = G4double(Z);
  elZ -= 1.;
  G4double Tkin = 12.*G4Exp(-elZ/10.) + 1.;
 
  return Tkin;
}

Referenced by SampleInvariantT().

◆ SampleInvariantT()

G4double G4DiffuseElasticV2::SampleInvariantT	(	const G4ParticleDefinition *	p,
		G4double	plab,
		G4int	Z,
		G4int	A )

virtual

Reimplemented from G4HadronicInteraction.

Definition at line 273 of file G4DiffuseElasticV2.cc.

{
  fParticle = aParticle;
  G4double m1 = fParticle->GetPDGMass(), t;
  G4double totElab = std::sqrt(m1*m1+p*p);
  G4double mass2 = G4NucleiProperties::GetNuclearMass(A, Z);
  G4LorentzVector lv1(p,0.0,0.0,totElab);
  G4LorentzVector  lv(0.0,0.0,0.0,mass2);   
  lv += lv1;
 
  G4ThreeVector bst = lv.boostVector();
  lv1.boost(-bst);
 
  G4ThreeVector p1 = lv1.vect();
  G4double momentumCMS = p1.mag();
  
  if( aParticle == theNeutron)
  {
    G4double Tmax = NeutronTuniform( Z );
    G4double pCMS2 = momentumCMS*momentumCMS;
    G4double Tkin = std::sqrt(pCMS2+m1*m1)-m1;
 
    if( Tkin <= Tmax )
    {
      t = 4.*pCMS2*G4UniformRand();
      return t;
    }
  }
  
  t = SampleTableT( aParticle,  momentumCMS, G4double(Z), G4double(A) ); // sample theta in cms
 
  return t;
}

◆ SampleTableT()

G4double G4DiffuseElasticV2::SampleTableT	(	const G4ParticleDefinition *	aParticle,
		G4double	p,
		G4double	Z,
		G4double	A )

Definition at line 324 of file G4DiffuseElasticV2.cc.

{
  G4double alpha = SampleTableThetaCMS( aParticle,  p, Z, A); // sample theta in cms
  G4double t     = 2*p*p*( 1 - std::cos(alpha) );             // -t !!!
  
  return t;
}

Referenced by SampleInvariantT().

◆ SampleTableThetaCMS()

G4double G4DiffuseElasticV2::SampleTableThetaCMS	(	const G4ParticleDefinition *	aParticle,
		G4double	p,
		G4double	Z,
		G4double	A )

Definition at line 339 of file G4DiffuseElasticV2.cc.

{
  std::size_t iElement;
  G4int iMomentum;
  unsigned long iAngle = 0;  
  G4double randAngle, position, theta1, theta2, E1, E2, W1, W2, W;  
  G4double m1 = particle->GetPDGMass();
 
  for(iElement = 0; iElement < fElementNumberVector.size(); iElement++)
  {
    if( std::fabs(Z - fElementNumberVector[iElement]) < 0.5) break;
  }
 
  if ( iElement == fElementNumberVector.size() ) 
  {
    InitialiseOnFly(Z,A); // table preparation, if needed
  }
  
  fEnergyAngleVector = fEnergyAngleVectorBank[iElement];
  fEnergySumVector = fEnergySumVectorBank[iElement];
 
  
  G4double kinE = std::sqrt(momentum*momentum + m1*m1) - m1;
    
  iMomentum = G4int(fEnergyVector->FindBin(kinE,1000) + 1);
  
  position = (*(*fEnergySumVector)[iMomentum])[0]*G4UniformRand();
 
  for(iAngle = 0; iAngle < fAngleBin; ++iAngle)
    {
      if (position > (*(*fEnergySumVector)[iMomentum])[iAngle]) break;
    }
 
  
  if (iMomentum == fEnergyBin -1 || iMomentum == 0 )   // the table edges
    {     
      randAngle = GetScatteringAngle(iMomentum, iAngle, position);
    }
  else  // kinE inside between energy table edges
    {                  
      theta2  = GetScatteringAngle(iMomentum, iAngle, position);
      
      E2 = fEnergyVector->Energy(iMomentum);
      
      iMomentum--;
      
      theta1  = GetScatteringAngle(iMomentum, iAngle, position);
    
      E1 = fEnergyVector->Energy(iMomentum);
    
      W  = 1.0/(E2 - E1);
      W1 = (E2 - kinE)*W;
      W2 = (kinE - E1)*W;
 
      randAngle = W1*theta1 + W2*theta2;
    }
 
 
 
  if(randAngle < 0.) randAngle = 0.;
 
  return randAngle;
}

Referenced by SampleTableT().

◆ SampleThetaCMS()

G4double G4DiffuseElasticV2::SampleThetaCMS	(	const G4ParticleDefinition *	aParticle,
		G4double	p,
		G4double	A )

◆ SampleThetaLab()

G4double G4DiffuseElasticV2::SampleThetaLab	(	const G4HadProjectile *	aParticle,
		G4double	tmass,
		G4double	A )

◆ SetHEModelLowLimit()

void G4DiffuseElasticV2::SetHEModelLowLimit ( G4double value )

inline

Definition at line 194 of file G4DiffuseElasticV2.hh.

{
  lowEnergyLimitHE = value;
}

◆ SetLowestEnergyLimit()

void G4DiffuseElasticV2::SetLowestEnergyLimit ( G4double value )

inline

Definition at line 204 of file G4DiffuseElasticV2.hh.

{
  lowestEnergyLimit = value;
}

◆ SetPlabLowLimit()

void G4DiffuseElasticV2::SetPlabLowLimit ( G4double value )

inline

Definition at line 189 of file G4DiffuseElasticV2.hh.

{
  plabLowLimit = value;
}

◆ SetQModelLowLimit()

void G4DiffuseElasticV2::SetQModelLowLimit ( G4double value )

inline

Definition at line 199 of file G4DiffuseElasticV2.hh.

{
  lowEnergyLimitQ = value;
}

◆ SetRecoilKinEnergyLimit()

void G4DiffuseElasticV2::SetRecoilKinEnergyLimit ( G4double value )

inline

Definition at line 184 of file G4DiffuseElasticV2.hh.

{
  lowEnergyRecoilLimit = value;
}

◆ ThetaCMStoThetaLab()

G4double G4DiffuseElasticV2::ThetaCMStoThetaLab	(	const G4DynamicParticle *	aParticle,
		G4double	tmass,
		G4double	thetaCMS )

Definition at line 551 of file G4DiffuseElasticV2.cc.

{
  const G4ParticleDefinition* theParticle = aParticle->GetDefinition();
  G4double m1 = theParticle->GetPDGMass();
  G4LorentzVector lv1 = aParticle->Get4Momentum();
  G4LorentzVector lv(0.0,0.0,0.0,tmass);   
 
  lv += lv1;
 
  G4ThreeVector bst = lv.boostVector();
 
  lv1.boost(-bst);
 
  G4ThreeVector p1 = lv1.vect();
  G4double ptot    = p1.mag();
 
  G4double phi  = G4UniformRand()*twopi;
  G4double cost = std::cos(thetaCMS);
  G4double sint;
 
  if( cost >= 1.0 ) 
  {
    cost = 1.0;
    sint = 0.0;
  }
  else if( cost <= -1.0) 
  {
    cost = -1.0;
    sint =  0.0;
  }
  else  
  {
    sint = std::sqrt((1.0-cost)*(1.0+cost));
  }    
  if (verboseLevel>1) 
  {
    G4cout << "cos(tcms)=" << cost << " std::sin(tcms)=" << sint << G4endl;
  }
  G4ThreeVector v1(sint*std::cos(phi),sint*std::sin(phi),cost);
  v1 *= ptot;
  G4LorentzVector nlv1(v1.x(),v1.y(),v1.z(),std::sqrt(ptot*ptot + m1*m1));
 
  nlv1.boost(bst); 
 
  G4ThreeVector np1 = nlv1.vect();
 
  G4double thetaLab = np1.theta();
 
  return thetaLab;
}

◆ ThetaLabToThetaCMS()

G4double G4DiffuseElasticV2::ThetaLabToThetaCMS	(	const G4DynamicParticle *	aParticle,
		G4double	tmass,
		G4double	thetaLab )

Definition at line 609 of file G4DiffuseElasticV2.cc.

{
  const G4ParticleDefinition* theParticle = aParticle->GetDefinition();
  G4double m1 = theParticle->GetPDGMass();
  G4double plab = aParticle->GetTotalMomentum();
  G4LorentzVector lv1 = aParticle->Get4Momentum();
  G4LorentzVector lv(0.0,0.0,0.0,tmass);   
 
  lv += lv1;
 
  G4ThreeVector bst = lv.boostVector();
 
  G4double phi  = G4UniformRand()*twopi;
  G4double cost = std::cos(thetaLab);
  G4double sint;
 
  if( cost >= 1.0 ) 
  {
    cost = 1.0;
    sint = 0.0;
  }
  else if( cost <= -1.0) 
  {
    cost = -1.0;
    sint =  0.0;
  }
  else  
  {
    sint = std::sqrt((1.0-cost)*(1.0+cost));
  }    
  if (verboseLevel>1) 
  {
    G4cout << "cos(tlab)=" << cost << " std::sin(tlab)=" << sint << G4endl;
  }
  G4ThreeVector v1(sint*std::cos(phi),sint*std::sin(phi),cost);
  v1 *= plab;
  G4LorentzVector nlv1(v1.x(),v1.y(),v1.z(),std::sqrt(plab*plab + m1*m1));
 
  nlv1.boost(-bst); 
 
  G4ThreeVector np1 = nlv1.vect();
  G4double thetaCMS = np1.theta();
 
  return thetaCMS;
}

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

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ G4DiffuseElasticV2()

◆ ~G4DiffuseElasticV2()

Member Function Documentation

◆ BesselJone()

◆ BesselJzero()

◆ BesselOneByArg()

◆ BuildAngleTable()

◆ CalculateAm()

◆ CalculateNuclearRad()

◆ CalculateZommerfeld()

◆ DampFactor()

◆ GetDiffElasticSumProbA()

◆ GetIntegrandFunction()

◆ GetNuclearRadius()

◆ GetScatteringAngle()

◆ Initialise()

◆ InitialiseOnFly()

◆ IsApplicable()

◆ NeutronTuniform()

◆ SampleInvariantT()

◆ SampleTableT()

◆ SampleTableThetaCMS()

◆ SampleThetaCMS()

◆ SampleThetaLab()

◆ SetHEModelLowLimit()

◆ SetLowestEnergyLimit()

◆ SetPlabLowLimit()

◆ SetQModelLowLimit()

◆ SetRecoilKinEnergyLimit()

◆ ThetaCMStoThetaLab()

◆ ThetaLabToThetaCMS()