G4AntiNuclElastic Class Reference

#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 G4HadFinalState *	ApplyYourself (const G4HadProjectile &aTrack, G4Nucleus &targetNucleus)
virtual G4double	SampleInvariantT (const G4ParticleDefinition *p, G4double plab, G4int Z, G4int A)
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	ModelDescription (std::ostream &outFile) const
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
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.

{}

Member Function Documentation

BesselJone()

G4double G4AntiNuclElastic::BesselJone

(

G4double

z

)

Definition at line 589 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 538 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 636 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 522 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 499 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 513 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 479 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(), G4HadronDElasticPhysics::ConstructProcess(), and G4HadronHElasticPhysics::ConstructProcess().

GetcosTeta1()

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

Definition at line 655 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 * theDef = 0;
 
  if(Z == 1 && A == 1)       theDef = theProton;
  else if (Z == 1 && A == 2) theDef = theDeuteron;
  else if (Z == 1 && A == 3) theDef = G4Triton::Triton();
  else if (Z == 2 && A == 3) theDef = G4He3::He3();
  else if (Z == 2 && A == 4) theDef = 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;  
 
  if(Plab < (std::abs(particle->GetBaryonNumber())*100)*MeV)   // Uzhi 24 Nov. 2011
  {return fTmax*G4UniformRand();}                              // Uzhi 24 Nov. 2011
  
  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.);  
  G4double  XsCoulomb = sqr(n/fWaveVector)*pi*(1+ctet1)/(1.+Am)/(1.+2.*Am-ctet1); 
  XsCoulomb=XsCoulomb*0.38938e+6;
 
  G4double XsElastHad =cs->GetElasticElementCrossSection(particle, energy, Z, (G4double)A);
  G4double XstotalHad =cs->GetTotalElementCrossSection(particle, energy, Z, (G4double)A);
 
  XsElastHad/=millibarn; XstotalHad/=millibarn;
 
  G4double CoulombProb =  XsCoulomb/(XsCoulomb+XsElastHad);
 
// G4cout<<" XselastHadron " << XsElastHad << "  XsCol "<< XsCoulomb <<G4endl; 
// G4cout <<"  XsTotal" << XstotalHad <<G4endl;  
// G4cout<<"XsInel"<< XstotalHad-XsElastHad<<G4endl;        
 
  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 Qmax = 2.*3.0*197.33;    // in fm^-1
   G4double Amag = 70*70;          //  A1 in Magora funct:A1*exp(-q*A2)
   G4double SlopeMag = 2.*3.0;    // A2 in Magora funct:A1*exp(-q*A2)
 
   G4double sig_pbarp= cs->GetAntiHadronNucleonTotCrSc(particle,energy); 
   
   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 = 0;
   G4double ceff2 =0;
   G4double rho = 0;
   if  ((theParticle == theAProton) || (theParticle == theANeutron))  
   {
    if(theDef == theProton)
    { 
//   G4double Mp2=sqr(theDef->GetPDGMass()/GeV ); 
 
// change 30 October
  
     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=0.8/std::sqrt(std::sqrt(S-4.*Mp2)) + 0.55; 
   if(S>1000.) Ref2=0.62+0.02*G4Log(S) ;
   ceff2 = 0.035/(sqr(S-4.3)+0.4) + 0.085 * G4Log(S) ;
   if(S>1000.) ceff2 = 0.005 * G4Log(S) + 0.29;
*/
 
     Ref2=Ref2*Ref2;
     ceff2 = ceff2*ceff2;
 
     SlopeMag = 0.5;        // Uzhi
     Amag= 1.;              // Uzhi
    }
 
    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);
    }
    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==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==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 (theParticle == theADeuteron)
   {
    sig_pbarp= cs->GetAntiHadronNucleonTotCrSc(particle,energy/2.); 
    Ref2 = XstotalHad/10./2./pi ;
    if(Z>2)
    {
     ceff2 = 0.38 + 2.0e-4 *sig_pbarp + 0.5 * G4Exp(-0.03*sig_pbarp);
    }
    if(theDef == theProton)
    { 
     ceff2 = 0.297 + 7.853e-04*sig_pbarp + 0.2899*G4Exp(-0.03*sig_pbarp);
    }
    if(theDef == theDeuteron)
    { 
     ceff2 = 0.65 + 3.0e-4*sig_pbarp + 0.55 * G4Exp(-0.03*sig_pbarp);
    }
    if( (theDef == G4Triton::Triton()) || (theDef == G4He3::He3() ) )
    {
     ceff2 = 0.57 + 2.5e-4*sig_pbarp + 0.65 * G4Exp(-0.02*sig_pbarp);
    }
    if(theDef == theAlpha)
    {
     ceff2 = 0.40 + 3.5e-4 *sig_pbarp + 0.45 * G4Exp(-0.02*sig_pbarp);
    }
   }
 
   if( (theParticle ==theAHe3) || (theParticle ==theATriton) )
   {
    sig_pbarp = cs->GetAntiHadronNucleonTotCrSc(particle,energy/3.);
    Ref2 = XstotalHad/10./2./pi ;
    if(Z>2)
    {
     ceff2 = 0.26 + 2.2e-4*sig_pbarp + 0.33*G4Exp(-0.03*sig_pbarp);
    }  
    if(theDef == theProton)
    {
     ceff2 = 0.149 + 7.091e-04*sig_pbarp + 0.3743*G4Exp(-0.03*sig_pbarp);         
    }
    if(theDef == theDeuteron)
    {
     ceff2 = 0.57 + 2.5e-4*sig_pbarp + 0.65 * G4Exp(-0.02*sig_pbarp);
    }
    if( (theDef == G4Triton::Triton()) || (theDef == G4He3::He3() ) )
    {
     ceff2 = 0.39 + 2.7e-4*sig_pbarp + 0.7 * G4Exp(-0.02*sig_pbarp);
    }
    if(theDef == theAlpha)
    {
     ceff2 = 0.24 + 3.5e-4*sig_pbarp + 0.75 * G4Exp(-0.03*sig_pbarp);
    }
   }
 
 
   if (theParticle == theAAlpha)
   {
    sig_pbarp = cs->GetAntiHadronNucleonTotCrSc(particle,energy/3.);
    Ref2 = XstotalHad/10./2./pi ;
    if(Z>2)
    {
     ceff2 = 0.22 + 2.0e-4*sig_pbarp + 0.2 * G4Exp(-0.03*sig_pbarp);
    }
    if(theDef == theProton)
    {
     ceff2= 0.078 + 6.657e-4*sig_pbarp + 0.3359*G4Exp(-0.03*sig_pbarp);   
    }
    if(theDef == theDeuteron)  
    {
     ceff2 = 0.40 + 3.5e-4 *sig_pbarp + 0.45 * G4Exp(-0.02*sig_pbarp);
    }   
    if( (theDef == G4Triton::Triton()) || (theDef == G4He3::He3() ) )
    {
     ceff2 = 0.24 + 3.5e-4*sig_pbarp + 0.75 * G4Exp(-0.03*sig_pbarp);   
    }
    if(theDef == theAlpha)   
    {
     ceff2 = 0.17 + 3.5e-4*sig_pbarp + 0.45 * G4Exp(-0.03*sig_pbarp);
    }
   }
 
   fRef=std::sqrt(Ref2);
   fceff = std::sqrt(ceff2);     
// G4cout<<" Ref  "<<fRef<<" c_eff "<<fceff<< " rho "<< rho<<G4endl; 
 
 
   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 * sqr(sqr(fRef));   
   } 
   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 -> MeV^2
   }
 
  // VI: 29.04.2019 unnecessary computation of trigonometry
  /*
   G4double cosTet=1.0-T/(2.*ptot*ptot);
   if(cosTet >  1.0 ) cosTet= 1.;          // Uzhi 30 Nov. 
   if(cosTet < -1.0 ) cosTet=-1.;          // Uzhi 30 Nov. 
   fTetaCMS=std::acos(cosTet);
  */
   return T;
}

Referenced by SampleThetaCMS(), and SampleThetaLab().

SampleThetaCMS()

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

Definition at line 387 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.)                             // Uzhi 24 Nov. 2011
  {
   G4double cosTet=1.0-T/(2.*fptot*fptot);
   if(cosTet >  1.0 ) cosTet= 1.;          // Uzhi 30 Nov. 
   if(cosTet < -1.0 ) cosTet=-1.;          // Uzhi 30 Nov. 
   fTetaCMS=std::acos(cosTet); 
   return fTetaCMS;
  } else                                    // Uzhi 24 Nov. 2011
  {                                         // Uzhi 24 Nov. 2011
   return 2.*G4UniformRand()-1.;            // Uzhi 24 Nov. 2011
  }                                         // Uzhi 24 Nov. 2011
}  

SampleThetaLab()

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

Definition at line 423 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;}             // Uzhi 24 Nov. 2011
 
  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:

• G4AntiNuclElastic.hh
• G4AntiNuclElastic.cc