G4CoulombBarrier Class Reference

#include <G4CoulombBarrier.hh>

Inheritance diagram for G4CoulombBarrier:

Public Member Functions
	G4CoulombBarrier ()
	G4CoulombBarrier (G4int anA, G4int aZ)
virtual	~G4CoulombBarrier ()
G4double	GetCoulombBarrier (G4int ARes, G4int ZRes, G4double U) const
Public Member Functions inherited from G4VCoulombBarrier
	G4VCoulombBarrier (G4int anA, G4int aZ)
virtual	~G4VCoulombBarrier ()
virtual G4double	GetCoulombBarrier (G4int ARes, G4int ZRes, G4double U) const =0
G4int	GetA (void) const
G4int	GetZ (void) const

Detailed Description

Definition at line 43 of file G4CoulombBarrier.hh.

Constructor & Destructor Documentation

G4CoulombBarrier() [1/2]

G4CoulombBarrier::G4CoulombBarrier

(

)

Definition at line 42 of file G4CoulombBarrier.cc.

                                  : G4VCoulombBarrier(1,0) 
{}

G4CoulombBarrier() [2/2]

G4CoulombBarrier::G4CoulombBarrier	(	G4int	anA,
		G4int	aZ
	)

Definition at line 45 of file G4CoulombBarrier.cc.

  : G4VCoulombBarrier(anA,aZ) 
{}

~G4CoulombBarrier()

G4CoulombBarrier::~G4CoulombBarrier ( )

virtual

Definition at line 49 of file G4CoulombBarrier.cc.

{}

Member Function Documentation

GetCoulombBarrier()

G4double G4CoulombBarrier::GetCoulombBarrier ( G4int  ARes, G4int  ZRes, G4double  U  ) const

virtual

New coulomb Barrier according to original Dostrovski's paper

Implements G4VCoulombBarrier.

Definition at line 57 of file G4CoulombBarrier.cc.

{
  G4double Barrier = 0.0;
  if (ZRes > ARes || ARes < 1) {
    std::ostringstream errOs;
    errOs << "G4CoulombBarrier::GetCoulombBarrier: ";
    errOs << "Wrong values for ";
    errOs << "residual nucleus A = " << ARes << " ";
    errOs << "and residual nucleus Z = " << ZRes << G4endl;
 
    throw G4HadronicException(__FILE__, __LINE__, errOs.str());
  }
  if (GetA() == 1 && GetZ() == 0) {
    Barrier = 0.0;   // Neutron Coulomb Barrier is 0
  } else {
 
    // JMQ: old coulomb barrier commented since it does not agree with Dostrovski's prescription
    // and too low  barriers are obtained (for protons at least)
    // calculation of K penetration factor is correct
    //    G4double CompoundRadius = CalcCompoundRadius(static_cast<G4double>(ZRes));
    //    Barrier = elm_coupling/CompoundRadius * static_cast<G4double>(GetZ())*static_cast<G4double>(ZRes)/
    //      (std::pow(static_cast<G4double>(GetA()),1./3.) + std::pow(static_cast<G4double>(ARes),1./3.));
 
    ///New coulomb Barrier according to original Dostrovski's paper 
    G4double rho=1.2*fermi; 
    if(GetA()==1 && GetZ()==1){  rho=0.0;}  
 
    G4double RN=1.5*fermi;  
    // VI cleanup 
    Barrier=elm_coupling*(GetZ()*ZRes)/(RN * G4Pow::GetInstance()->Z13(ARes) + rho);
 
    // Barrier penetration coeficient
    G4double K = BarrierPenetrationFactor(ZRes);
 
    Barrier *= K;
        
    // JMQ : the following statement has unknown origin and dimensionally is meaningless( energy divided by mass number in argument of sqrt function). Energy dependence of Coulomb barrier penetrability should be included in proper way (if needed..)
    //   Barrier /= (1.0 + std::sqrt(U/(2.0*static_cast<G4double>(ARes))));
    //
  }
  return Barrier;
}

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

• G4CoulombBarrier.hh
• G4CoulombBarrier.cc