#include <G4AntiNuclElastic.hh>

Inheritance diagram for G4AntiNuclElastic:

Public Member Functions
	G4AntiNuclElastic ()

	~G4AntiNuclElastic () override

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

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

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

G4double	CalculateParticleBeta (const G4ParticleDefinition *particle, G4double momentum)

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

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

G4double	DampFactor (G4double z)

G4double	BesselJzero (G4double z)

G4double	BesselJone (G4double z)

G4double	BesselOneByArg (G4double z)

G4double	GetcosTeta1 (G4double plab, G4int A)

G4ComponentAntiNuclNuclearXS *	GetComponentCrossSection ()

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 ()

virtual G4bool	IsApplicable (const G4HadProjectile &aTrack, G4Nucleus &targetNucleus)

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 46 of file G4AntiNuclElastic.hh.

Constructor & Destructor Documentation

◆ G4AntiNuclElastic()

G4AntiNuclElastic::G4AntiNuclElastic ( )

explicit

Definition at line 56 of file G4AntiNuclElastic.cc.

  : G4HadronElastic("AntiAElastic")
{
  //V.Ivanchenko commented out 
  //SetMinEnergy( 0.1*GeV );
  //SetMaxEnergy( 10.*TeV );
 
  theAProton       = G4AntiProton::AntiProton();
  theANeutron      = G4AntiNeutron::AntiNeutron();
  theADeuteron     = G4AntiDeuteron::AntiDeuteron();
  theATriton       = G4AntiTriton::AntiTriton();
  theAAlpha        = G4AntiAlpha::AntiAlpha();
  theAHe3          = G4AntiHe3::AntiHe3();
 
  theProton   = G4Proton::Proton();
  theNeutron  = G4Neutron::Neutron();
  theDeuteron = G4Deuteron::Deuteron();
  theAlpha    = G4Alpha::Alpha();
 
  G4CrossSectionDataSetRegistry* reg = G4CrossSectionDataSetRegistry::Instance();
  cs = static_cast<G4ComponentAntiNuclNuclearXS*>(reg->GetComponentCrossSection("AntiAGlauber"));
  if(!cs) { cs = new G4ComponentAntiNuclNuclearXS(); }
 
  fParticle = 0;
  fWaveVector = 0.;
  fBeta = 0.;
  fZommerfeld = 0.;
  fAm = 0.;
  fTetaCMS = 0.;    
  fRa = 0.;
  fRef = 0.;
  fceff = 0.;
  fptot = 0.;
  fTmax = 0.;
  fThetaLab = 0.;
}

◆ ~G4AntiNuclElastic()

G4AntiNuclElastic::~G4AntiNuclElastic ( )

override

Definition at line 94 of file G4AntiNuclElastic.cc.

95{}

Member Function Documentation

◆ BesselJone()

G4double G4AntiNuclElastic::BesselJone ( G4double z )

Definition at line 570 of file G4AntiNuclElastic.cc.

{
  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().

◆ BesselJzero()

G4double G4AntiNuclElastic::BesselJzero ( G4double z )

Definition at line 519 of file G4AntiNuclElastic.cc.

{  
  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 SampleInvariantT().

◆ BesselOneByArg()

G4double G4AntiNuclElastic::BesselOneByArg ( G4double z )

Definition at line 617 of file G4AntiNuclElastic.cc.

{
  G4double x2, result;
 
  if( std::fabs(x) < 0.01 )
  {
   x  *= 0.5;
   x2 = x*x;
   result = (2.- x2 + x2*x2/6.)/4.;
  }
  else
  {
    result = BesselJone(x)/x;
  }
  return result;
} 

Referenced by SampleInvariantT().

◆ CalculateAm()

G4double G4AntiNuclElastic::CalculateAm	(	G4double	momentum,
		G4double	n,
		G4double	Z )

Definition at line 503 of file G4AntiNuclElastic.cc.

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

Referenced by SampleInvariantT().

◆ CalculateParticleBeta()

G4double G4AntiNuclElastic::CalculateParticleBeta	(	const G4ParticleDefinition *	particle,
		G4double	momentum )

Definition at line 480 of file G4AntiNuclElastic.cc.

{
  G4double mass = particle->GetPDGMass();
  G4double a    = momentum/mass;
  fBeta         = a/std::sqrt(1+a*a);
 
  return fBeta; 
}

Referenced by SampleInvariantT().

◆ CalculateZommerfeld()

G4double G4AntiNuclElastic::CalculateZommerfeld	(	G4double	beta,
		G4double	Z1,
		G4double	Z2 )

Definition at line 494 of file G4AntiNuclElastic.cc.

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

Referenced by SampleInvariantT().

◆ DampFactor()

G4double G4AntiNuclElastic::DampFactor ( G4double z )

Definition at line 460 of file G4AntiNuclElastic.cc.

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

Referenced by SampleInvariantT().

◆ GetComponentCrossSection()

G4ComponentAntiNuclNuclearXS * G4AntiNuclElastic::GetComponentCrossSection ( )

inline

Definition at line 121 of file G4AntiNuclElastic.hh.

{
  return cs;
}

Referenced by LBE::ConstructHad().

◆ GetcosTeta1()

G4double G4AntiNuclElastic::GetcosTeta1	(	G4double	plab,
		G4int	A )

Definition at line 636 of file G4AntiNuclElastic.cc.

{
 
// G4double p0 =G4LossTableManager::Instance()->FactorForAngleLimit()*CLHEP::hbarc/CLHEP::fermi;
  G4double p0 = 1.*hbarc/fermi;
//G4double cteta1 = 1.0 - p0*p0/2.0 * pow(A,2./3.)/(plab*plab);
  G4double cteta1 = 1.0 - p0*p0/2.0 * G4Pow::GetInstance()->Z23(A)/(plab*plab);
//////////////////
  if(cteta1 < -1.) cteta1 = -1.0;
  return cteta1;
}

Referenced by SampleInvariantT().

◆ SampleInvariantT()

G4double G4AntiNuclElastic::SampleInvariantT	(	const G4ParticleDefinition *	p,
		G4double	plab,
		G4int	Z,
		G4int	A )

overridevirtual

Reimplemented from G4HadronicInteraction.

Definition at line 99 of file G4AntiNuclElastic.cc.

{
  G4double T;
  G4double Mproj = particle->GetPDGMass();
  G4LorentzVector Pproj(0.,0.,Plab,std::sqrt(Plab*Plab+Mproj*Mproj));
  G4double ctet1 = GetcosTeta1(Plab, A); 
 
  G4double energy=Pproj.e()-Mproj;   
  
  const G4ParticleDefinition* theParticle = particle;
 
  G4ParticleDefinition * theTargetDef = 0;
 
  if      (Z == 1 && A == 1) theTargetDef = theProton;
  else if (Z == 1 && A == 2) theTargetDef = theDeuteron;
  else if (Z == 1 && A == 3) theTargetDef = G4Triton::Triton();
  else if (Z == 2 && A == 3) theTargetDef = G4He3::He3();
  else if (Z == 2 && A == 4) theTargetDef = theAlpha;
 
 
  G4double TargMass =G4NucleiProperties::GetNuclearMass(A,Z); 
 
  //transform to CMS
 
  G4LorentzVector lv(0.0,0.0,0.0,TargMass);   
  lv += Pproj;
  G4double S = lv.mag2()/(GeV*GeV);
 
  G4ThreeVector bst = lv.boostVector();
  Pproj.boost(-bst);
 
  G4ThreeVector p1 = Pproj.vect();
  G4double ptot    = p1.mag();
 
  fbst = bst;
  fptot= ptot;
  fTmax = 4.0*ptot*ptot;  // In (MeV/c)^2
 
  if(Plab < (std::abs(particle->GetBaryonNumber())*100)*MeV)
  {return fTmax*G4UniformRand();}
  
  // Calculation of NN collision properties
  G4double PlabPerN = Plab/std::abs(theParticle->GetBaryonNumber());
  G4double NucleonMass = 0.5*( theProton->GetPDGMass() + theNeutron->GetPDGMass() );
  G4double PrNucleonMass(0.);  // Projectile average nucleon mass
  if( std::abs(theParticle->GetBaryonNumber()) == 1 ) { PrNucleonMass = theParticle->GetPDGMass(); }
  else                                                { PrNucleonMass = NucleonMass;               }
  G4double energyPerN = std::sqrt( sqr(PlabPerN) + sqr(PrNucleonMass));
  energyPerN -= PrNucleonMass;
  //---
 
  G4double  Z1 = particle->GetPDGCharge();
  G4double  Z2 = Z;  
  
  G4double beta = CalculateParticleBeta(particle, ptot); 
  G4double n  = CalculateZommerfeld( beta,  Z1,  Z2 );
  G4double Am = CalculateAm( ptot,  n,  Z2 );
  fWaveVector = ptot;     //   /hbarc; 
        
  G4LorentzVector Fproj(0.,0.,0.,0.);  
  const G4double mevToBarn = 0.38938e+6;
  G4double XsCoulomb = mevToBarn*sqr(n/fWaveVector)*pi*(1+ctet1)/(1.+Am)/(1.+2.*Am-ctet1);
 
  G4double XsElastHadronic =cs->GetElasticElementCrossSection(particle, energy, Z, (G4double)A);
  G4double XsTotalHadronic =cs->GetTotalElementCrossSection(particle, energy, Z, (G4double)A);
 
  XsElastHadronic/=millibarn; XsTotalHadronic/=millibarn;
 
  G4double CoulombProb =  XsCoulomb/(XsCoulomb+XsElastHadronic);
 
  if(G4UniformRand() < CoulombProb)
  {  // Simulation of Coulomb scattering
 
    G4double phi = twopi * G4UniformRand();
    G4double Ksi =  G4UniformRand();
 
    G4double par1 = 2.*(1.+Am)/(1.+ctet1);
 
    // ////sample ThetaCMS in Coulomb part
 
    G4double cosThetaCMS = (par1*ctet1- Ksi*(1.+2.*Am))/(par1-Ksi);
 
    G4double PtZ=ptot*cosThetaCMS;
    Fproj.setPz(PtZ);
    G4double PtProjCMS = ptot*std::sqrt(1.0 - cosThetaCMS*cosThetaCMS);
    G4double PtX= PtProjCMS * std::cos(phi);
    G4double PtY= PtProjCMS * std::sin(phi);
    Fproj.setPx(PtX);     
    Fproj.setPy(PtY);
    Fproj.setE(std::sqrt(PtX*PtX+PtY*PtY+PtZ*PtZ+Mproj*Mproj));    
    T =  -(Pproj-Fproj).mag2();      
  } 
  else 
  {  
    // Simulation of strong interaction scattering
 
    G4double Qmax = 2.*ptot/197.33;   // in fm^-1
 
    G4double Amag      = 1.0;  // A1 in Majorant funct:A1*exp(-q*A2)
    G4double SlopeMag  = 0.5;  // A2 in Majorant funct:A1*exp(-q*A2)
    
    G4double sig_pbarp = cs->GetAntiHadronNucleonTotCrSc(theAProton,energyPerN);  //mb
 
    fRa = 1.113*G4Pow::GetInstance()->Z13(A) -                     
          0.227/G4Pow::GetInstance()->Z13(A);                      
    if(A == 3) fRa=1.81;
    if(A == 4) fRa=1.37;
 
    if((A>=12.) && (A<27) ) fRa=fRa*0.85;
    if((A>=27.) && (A<48) ) fRa=fRa*0.90;
    if((A>=48.) && (A<65) ) fRa=fRa*0.95;
 
    G4double Ref2 = XsTotalHadronic/10./2./pi;  // in fm^2
    G4double ceff2 = 0.0;
    G4double rho = 0.0;
 
    if  ((theParticle == theAProton) || (theParticle == theANeutron))  
    {
      if(theTargetDef == theProton)
      { 
        // Determination of the real part of Pbar+N amplitude
        if(Plab < 610.) 
        { rho = 1.3347-10.342*Plab/1000.+22.277*Plab/1000.*Plab/1000.-
                13.634*Plab/1000.*Plab/1000.*Plab/1000. ;}
        if((Plab < 5500.)&&(Plab >= 610.) )
        { rho = 0.22; }
        if((Plab >= 5500.)&&(Plab < 12300.) )
        { rho = -0.32; }
        if( Plab >= 12300.)
        { rho = 0.135-2.26/(std::sqrt(S)) ;}
        Ref2  = 0.35 + 0.9/std::sqrt(std::sqrt(S-4.*0.88))+0.04*G4Log(S) ;
        ceff2 = 0.375 - 2./S + 0.44/(sqr(S-4.)+1.5) ;
        Ref2  =Ref2*Ref2;
        ceff2 = ceff2*ceff2;
      }
 
      if( (Z==1)&&(A==2) )
      {
        Ref2 = fRa*fRa - 0.28 + 0.019 * sig_pbarp + 2.06e-6 * sig_pbarp*sig_pbarp;  
        ceff2 = 0.297 + 7.853e-04*sig_pbarp + 0.2899*G4Exp(-0.03*sig_pbarp);
      }
      if( (Z==1)&&(A==3) )
      { 
        Ref2 = fRa*fRa - 1.36 + 0.025 * sig_pbarp - 3.69e-7 * sig_pbarp*sig_pbarp;
        ceff2 = 0.149 + 7.091e-04*sig_pbarp + 0.3743*G4Exp(-0.03*sig_pbarp);
      }
      if( (Z==2)&&(A==3) )
      { 
        Ref2 = fRa*fRa - 1.36 + 0.025 * sig_pbarp - 3.69e-7 * sig_pbarp*sig_pbarp;
        ceff2 = 0.149 + 7.091e-04*sig_pbarp + 0.3743*G4Exp(-0.03*sig_pbarp);
      }  
      if( (Z==2)&&(A==4) )
      { 
        Ref2 = fRa*fRa -0.46 +0.03*sig_pbarp - 2.98e-6*sig_pbarp*sig_pbarp;
        ceff2= 0.078 + 6.657e-4*sig_pbarp + 0.3359*G4Exp(-0.03*sig_pbarp);
      }
      if(Z>2) 
      { 
        Ref2 = fRa*fRa +2.48*0.01*sig_pbarp*fRa - 2.23e-6*sig_pbarp*sig_pbarp*fRa*fRa; 
        ceff2 = 0.16+3.3e-4*sig_pbarp+0.35*G4Exp(-0.03*sig_pbarp);
      }
    }  // End of if ((theParticle == theAProton) || (theParticle == theANeutron))
 
    if (theParticle == theADeuteron)
    {
      if(theTargetDef == theProton)
      { 
        ceff2 = 0.297 + 7.853e-04*sig_pbarp + 0.2899*G4Exp(-0.03*sig_pbarp);
      }
      if(theTargetDef == theDeuteron)
      { 
        ceff2 = 0.65 + 3.0e-4*sig_pbarp + 0.55 * G4Exp(-0.03*sig_pbarp);
      }
      if( (theTargetDef == G4Triton::Triton()) || (theTargetDef == G4He3::He3() ) )
      {
        ceff2 = 0.57 + 2.5e-4*sig_pbarp + 0.65 * G4Exp(-0.02*sig_pbarp);
      }
      if(theTargetDef == theAlpha)
      {
        ceff2 = 0.40 + 3.5e-4 *sig_pbarp + 0.45 * G4Exp(-0.02*sig_pbarp);
      }
      if(Z>2)
      {
        ceff2 = 0.38 + 2.0e-4 *sig_pbarp + 0.5 * G4Exp(-0.03*sig_pbarp);
      }
    }
 
    if( (theParticle ==theAHe3) || (theParticle ==theATriton) )
    {
      if(theTargetDef == theProton)
      {
        ceff2 = 0.149 + 7.091e-04*sig_pbarp + 0.3743*G4Exp(-0.03*sig_pbarp);         
      }
      if(theTargetDef == theDeuteron)
      {
        ceff2 = 0.57 + 2.5e-4*sig_pbarp + 0.65 * G4Exp(-0.02*sig_pbarp);
      }
      if( (theTargetDef == G4Triton::Triton()) || (theTargetDef == G4He3::He3() ) )
      {
        ceff2 = 0.39 + 2.7e-4*sig_pbarp + 0.7 * G4Exp(-0.02*sig_pbarp);
      }
      if(theTargetDef == theAlpha)
      {
        ceff2 = 0.24 + 3.5e-4*sig_pbarp + 0.75 * G4Exp(-0.03*sig_pbarp);
      }
      if(Z>2)
      {
        ceff2 = 0.26 + 2.2e-4*sig_pbarp + 0.33*G4Exp(-0.03*sig_pbarp);
      }  
    }
 
    if ( (theParticle == theAAlpha) || (ceff2 == 0.0) )
    {
      if(theTargetDef == theProton)
      {
        ceff2= 0.078 + 6.657e-4*sig_pbarp + 0.3359*G4Exp(-0.03*sig_pbarp);   
      }
      if(theTargetDef == theDeuteron)  
      {
        ceff2 = 0.40 + 3.5e-4 *sig_pbarp + 0.45 * G4Exp(-0.02*sig_pbarp);
      }   
      if( (theTargetDef == G4Triton::Triton()) || (theTargetDef == G4He3::He3() ) )
      {
        ceff2 = 0.24 + 3.5e-4*sig_pbarp + 0.75 * G4Exp(-0.03*sig_pbarp);   
      }
      if(theTargetDef == theAlpha)   
      {
        ceff2 = 0.17 + 3.5e-4*sig_pbarp + 0.45 * G4Exp(-0.03*sig_pbarp);
      }
      if(Z>2)
      {
        ceff2 = 0.22 + 2.0e-4*sig_pbarp + 0.2 * G4Exp(-0.03*sig_pbarp);
      }
    }
 
    fRef=std::sqrt(Ref2);
    fceff = std::sqrt(ceff2);     
 
    G4double Q = 0.0 ;
    G4double BracFunct;
 
    const G4int maxNumberOfLoops = 10000;
    G4int loopCounter = 0;
    do 
    {
      Q = -G4Log(1.-(1.- G4Exp(-SlopeMag * Qmax))* G4UniformRand() )/SlopeMag;
      G4double x = fRef * Q;
      BracFunct = ( ( sqr(BesselOneByArg(x))+sqr(rho/2. * BesselJzero(x)) )
            *   sqr(DampFactor(pi*fceff*Q))) /(Amag*G4Exp(-SlopeMag*Q));
      BracFunct = BracFunct * Q;
    } 
    while ( (G4UniformRand()>BracFunct) && 
            ++loopCounter < maxNumberOfLoops );  /* Loop checking, 10.08.2015, A.Ribon */
    if ( loopCounter >= maxNumberOfLoops ) {
      fTetaCMS = 0.0;
      return 0.0;
    }
 
    T= sqr(Q); 
    T*=3.893913e+4;  // fm^(-2) -> MeV^2
 
  }  // End of simulation of strong interaction scattering
 
  return T;
}

Referenced by SampleThetaCMS(), and SampleThetaLab().

◆ SampleThetaCMS()

G4double G4AntiNuclElastic::SampleThetaCMS	(	const G4ParticleDefinition *	p,
		G4double	plab,
		G4int	Z,
		G4int	A )

Definition at line 368 of file G4AntiNuclElastic.cc.

{ 
  G4double T;
  T =  SampleInvariantT( p, plab,  Z,  A);
 
   // NaN finder
  if(!(T < 0.0 || T >= 0.0))
  {
    if (verboseLevel > 0)
    {
      G4cout << "G4DiffuseElastic:WARNING: A = " << A
             << " mom(GeV)= " << plab/GeV
             << " S-wave will be sampled"
             << G4endl;
    }
    T = G4UniformRand()*fTmax;
 
  }
 
  if(fptot > 0.)
  {
   G4double cosTet=1.0-T/(2.*fptot*fptot);
   if(cosTet >  1.0 ) cosTet= 1.;
   if(cosTet < -1.0 ) cosTet=-1.;
   fTetaCMS=std::acos(cosTet); 
   return fTetaCMS;
  } else
  {
   return 2.*G4UniformRand()-1.;
  }
}  

◆ SampleThetaLab()

G4double G4AntiNuclElastic::SampleThetaLab	(	const G4ParticleDefinition *	p,
		G4double	plab,
		G4int	Z,
		G4int	A )

Definition at line 404 of file G4AntiNuclElastic.cc.

{ 
  G4double T; 
  T = SampleInvariantT( p, plab,  Z,  A);
 
 // NaN finder
  if(!(T < 0.0 || T >= 0.0))
  {
    if (verboseLevel > 0)               
    {
      G4cout << "G4DiffuseElastic:WARNING: A = " << A
             << " mom(GeV)= " << plab/GeV
             << " S-wave will be sampled"
             << G4endl;
    }
    T = G4UniformRand()*fTmax;
  }
 
  G4double phi  = G4UniformRand()*twopi;
 
  G4double cost(1.);
  if(fTmax > 0.) {cost = 1. - 2.0*T/fTmax;}
 
  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));
  }
 
  G4double m1 = p->GetPDGMass();
  G4ThreeVector v(sint*std::cos(phi),sint*std::sin(phi),cost);
  v *= fptot;
  G4LorentzVector nlv(v.x(),v.y(),v.z(),std::sqrt(fptot*fptot + m1*m1));
   
  nlv.boost(fbst);
   
  G4ThreeVector np = nlv.vect();
  G4double theta = np.theta();
  fThetaLab = theta; 
 
  return theta;
}

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

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ G4AntiNuclElastic()

◆ ~G4AntiNuclElastic()

Member Function Documentation

◆ BesselJone()

◆ BesselJzero()

◆ BesselOneByArg()

◆ CalculateAm()

◆ CalculateParticleBeta()

◆ CalculateZommerfeld()

◆ DampFactor()

◆ GetComponentCrossSection()

◆ GetcosTeta1()

◆ SampleInvariantT()

◆ SampleThetaCMS()

◆ SampleThetaLab()