G4PionRadiativeDecayChannel Class Reference

#include <G4PionRadiativeDecayChannel.hh>

Inheritance diagram for G4PionRadiativeDecayChannel:

Public Member Functions
	G4PionRadiativeDecayChannel (const G4String &theParentName, G4double theBR)
virtual	~G4PionRadiativeDecayChannel ()
virtual G4DecayProducts *	DecayIt (G4double)
Public Member Functions inherited from G4VDecayChannel
	G4VDecayChannel (const G4String &aName, G4int Verbose=1)
	G4VDecayChannel (const G4String &aName, const G4String &theParentName, G4double theBR, G4int theNumberOfDaughters, const G4String &theDaughterName1, const G4String &theDaughterName2="", const G4String &theDaughterName3="", const G4String &theDaughterName4="")
virtual	~G4VDecayChannel ()
G4int	operator== (const G4VDecayChannel &right) const
G4int	operator!= (const G4VDecayChannel &right) const
G4int	operator< (const G4VDecayChannel &right) const
const G4String &	GetKinematicsName () const
G4double	GetBR () const
G4int	GetNumberOfDaughters () const
G4ParticleDefinition *	GetParent ()
G4ParticleDefinition *	GetDaughter (G4int anIndex)
G4int	GetAngularMomentum ()
const G4String &	GetParentName () const
const G4String &	GetDaughterName (G4int anIndex) const
G4double	GetParentMass () const
G4double	GetDaughterMass (G4int anIndex) const
void	SetParent (const G4ParticleDefinition *particle_type)
void	SetParent (const G4String &particle_name)
void	SetBR (G4double value)
void	SetNumberOfDaughters (G4int value)
void	SetDaughter (G4int anIndex, const G4ParticleDefinition *particle_type)
void	SetDaughter (G4int anIndex, const G4String &particle_name)
void	SetVerboseLevel (G4int value)
G4int	GetVerboseLevel () const
void	DumpInfo ()

Protected Member Functions
	G4PionRadiativeDecayChannel (const G4PionRadiativeDecayChannel &)
G4PionRadiativeDecayChannel &	operator= (const G4PionRadiativeDecayChannel &)
	G4PionRadiativeDecayChannel ()
Protected Member Functions inherited from G4VDecayChannel
void	ClearDaughtersName ()
void	FillDaughters ()
void	FillParent ()
	G4VDecayChannel ()
	G4VDecayChannel (const G4VDecayChannel &)
G4VDecayChannel &	operator= (const G4VDecayChannel &)

Additional Inherited Members
Protected Attributes inherited from G4VDecayChannel
G4String	kinematics_name
G4double	rbranch
G4int	numberOfDaughters
G4String *	parent_name
G4String **	daughters_name
G4ParticleTable *	particletable
G4int	verboseLevel
G4ParticleDefinition *	G4MT_parent
G4ParticleDefinition **	G4MT_daughters
G4double	G4MT_parent_mass
G4double *	G4MT_daughters_mass
Static Protected Attributes inherited from G4VDecayChannel
static const G4String	noName = " "

Detailed Description

Definition at line 54 of file G4PionRadiativeDecayChannel.hh.

Constructor & Destructor Documentation

G4PionRadiativeDecayChannel::G4PionRadiativeDecayChannel	(	const G4String &	theParentName,
		G4double	theBR
	)

Definition at line 56 of file G4PionRadiativeDecayChannel.cc.

References G4cout, G4endl, G4VDecayChannel::GetVerboseLevel(), python.hepunit::MeV, G4VDecayChannel::SetBR(), G4VDecayChannel::SetDaughter(), G4VDecayChannel::SetNumberOfDaughters(), and G4VDecayChannel::SetParent().

                            : G4VDecayChannel("Radiative Pion Decay",1)
{
  // set names for daughter particles
  if (theParentName == "pi+") {
    SetBR(theBR);
    SetParent("pi+");
    SetNumberOfDaughters(3);
    SetDaughter(0, "e+");
    SetDaughter(1, "gamma");
    SetDaughter(2, "nu_e");
  } else if (theParentName == "pi-") {
    SetBR(theBR);
    SetParent("pi-");
    SetNumberOfDaughters(3);
    SetDaughter(0, "e-");
    SetDaughter(1, "gamma");
    SetDaughter(2, "anti_nu_e");
  } else {
#ifdef G4VERBOSE
    if (GetVerboseLevel()>0) {
      G4cout << "G4RadiativePionDecayChannel:: constructor :";
      G4cout << " parent particle is not charged pion but ";
      G4cout << theParentName << G4endl;
    }
#endif
  }

  beta = 3.6612e-03;

  cib  = 1.16141e-03;
  csdp = 3.45055e-02;
  csdm = 5.14122e-03;
  cif  = 4.63543e-05;
  cig  = 1.78928e-05;

  xl = 2.*0.1*MeV/139.57*MeV;
  yl = ((1.-xl) + std::sqrt((1-xl)*(1-xl)+4*beta*beta))/2.;

  xu = 1. - (yl - std::sqrt(yl*yl-4.*beta*beta))/2.;
  yu = 1. + beta*beta;

  d2wmax = D2W(xl,yl);

}

G4PionRadiativeDecayChannel::~G4PionRadiativeDecayChannel ( )

virtual

Definition at line 103 of file G4PionRadiativeDecayChannel.cc.

{
}

G4PionRadiativeDecayChannel::G4PionRadiativeDecayChannel ( const G4PionRadiativeDecayChannel &  right )

protected

Definition at line 106 of file G4PionRadiativeDecayChannel.cc.

  :G4VDecayChannel(right),
   beta(right.beta),cib(right.cib),csdp(right.csdp),
   csdm(right.csdm),cif(right.cif),cig(right.cig),
   xl(right.xl), yl(right.yl), xu(right.xu), yu(right.yu), 
   d2wmax(right.d2wmax)
{
}

G4PionRadiativeDecayChannel::G4PionRadiativeDecayChannel ( )

protected

Definition at line 48 of file G4PionRadiativeDecayChannel.cc.

  : G4VDecayChannel(),
    beta(0.),cib(0.),csdp(0.),csdm(0.),cif(0.),cig(0.),
    xl(0.), yl(0.), xu(0.), yu(0.), d2wmax(0.)
{
}

Member Function Documentation

G4DecayProducts * G4PionRadiativeDecayChannel::DecayIt ( G4double  )

virtual

Implements G4VDecayChannel.

Definition at line 153 of file G4PionRadiativeDecayChannel.cc.

References G4DecayProducts::DumpInfo(), G4VDecayChannel::FillDaughters(), G4VDecayChannel::FillParent(), G4cout, G4endl, G4VDecayChannel::G4MT_daughters, G4VDecayChannel::G4MT_parent, G4UniformRand, G4ParticleDefinition::GetPDGMass(), G4VDecayChannel::GetVerboseLevel(), G4DecayProducts::PushProducts(), python.hepunit::rad, CLHEP::Hep3Vector::rotateUz(), python.hepunit::twopi, and test::x.

{

#ifdef G4VERBOSE
  if (GetVerboseLevel()>1) 
                 G4cout << "G4PionRadiativeDecayChannel::DecayIt ";
#endif

  if (G4MT_parent == 0) FillParent();  
  if (G4MT_daughters == 0) FillDaughters();

  // parent mass
  G4double parentmass = G4MT_parent->GetPDGMass();

  G4double EMPI = parentmass;

  //daughters'mass
  G4double daughtermass[3]; 
  G4double sumofdaughtermass = 0.0;
  for (G4int index=0; index<3; index++){
    daughtermass[index] = G4MT_daughters[index]->GetPDGMass();
    sumofdaughtermass += daughtermass[index];
  }

  G4double EMASS = daughtermass[0];

  //create parent G4DynamicParticle at rest
  G4ThreeVector dummy;
  G4DynamicParticle * parentparticle = 
                               new G4DynamicParticle( G4MT_parent, dummy, 0.0);
  //create G4Decayproducts
  G4DecayProducts *products = new G4DecayProducts(*parentparticle);
  delete parentparticle;

  G4double x, y, d2w;

  do {

     do {

        x = xl + G4UniformRand()*(xu-xl);
        y = yl + G4UniformRand()*(yu-yl);

     } while (x+y <= 1.);

     d2w = D2W(x,y);

  } while (d2w <= G4UniformRand()*d2wmax);

//-----------------------------------------------------------------------
//
//      Calculate the angle between positron and photon (cosine)
//
  G4double cthetaGE =  (y*(x-2.)+2.*(1.-x+beta*beta)) /
                       (x*std::sqrt(y*y-4.*beta*beta));

//
//-----------------------------------------------------------------------
//
  G4double G = x * EMPI/2.;
  G4double E = y * EMPI/2.;
//
//-----------------------------------------------------------------------
//

  if (E < EMASS) E = EMASS;

  // calculate daughter momentum
  G4double daughtermomentum[2];

  daughtermomentum[0] = std::sqrt(E*E - EMASS*EMASS);

  G4double cthetaE = 2.*G4UniformRand()-1.;
  G4double sthetaE = std::sqrt(1.-cthetaE*cthetaE);

  G4double phiE = twopi*G4UniformRand()*rad;
  G4double cphiE = std::cos(phiE);
  G4double sphiE = std::sin(phiE);

  //Coordinates of the decay positron

  G4double px = sthetaE*cphiE;
  G4double py = sthetaE*sphiE;
  G4double pz = cthetaE;

  G4ThreeVector direction0(px,py,pz);

  G4DynamicParticle * daughterparticle0 
    = new G4DynamicParticle( G4MT_daughters[0], daughtermomentum[0]*direction0);

  products->PushProducts(daughterparticle0);

  daughtermomentum[1] = G;

  G4double sthetaGE = std::sqrt(1.-cthetaGE*cthetaGE);

  G4double phiGE = twopi*G4UniformRand()*rad;
  G4double cphiGE = std::cos(phiGE);
  G4double sphiGE = std::sin(phiGE);

  //Coordinates of the decay gamma with respect to the decay positron

  px = sthetaGE*cphiGE;
  py = sthetaGE*sphiGE;
  pz = cthetaGE;

  G4ThreeVector direction1(px,py,pz);

  direction1.rotateUz(direction0);

  G4DynamicParticle * daughterparticle1
    = new G4DynamicParticle( G4MT_daughters[1], daughtermomentum[1]*direction1);

  products->PushProducts(daughterparticle1);

// output message
#ifdef G4VERBOSE
  if (GetVerboseLevel()>1) {
    G4cout << "G4PionRadiativeDecayChannel::DecayIt ";
    G4cout << "  create decay products in rest frame " <<G4endl;
    products->DumpInfo();
  }
#endif

  return products;

}

G4PionRadiativeDecayChannel & G4PionRadiativeDecayChannel::operator= ( const G4PionRadiativeDecayChannel &  right )

protected

Definition at line 115 of file G4PionRadiativeDecayChannel.cc.

References G4VDecayChannel::ClearDaughtersName(), G4VDecayChannel::daughters_name, G4VDecayChannel::kinematics_name, G4VDecayChannel::numberOfDaughters, G4VDecayChannel::parent_name, G4VDecayChannel::rbranch, and G4VDecayChannel::verboseLevel.

{
  if (this != &right) { 
    kinematics_name = right.kinematics_name;
    verboseLevel = right.verboseLevel;
    rbranch = right.rbranch;

    // copy parent name
    parent_name = new G4String(*right.parent_name);

    // clear daughters_name array
    ClearDaughtersName();

    // recreate array
    numberOfDaughters = right.numberOfDaughters;
    if ( numberOfDaughters >0 ) {
      if (daughters_name !=0) ClearDaughtersName();
      daughters_name = new G4String*[numberOfDaughters];
      //copy daughters name
      for (G4int index=0; index < numberOfDaughters; index++) {
          daughters_name[index] = new G4String(*right.daughters_name[index]);
      }
    }
    beta = right.beta;
    cib  = right.cib;
    csdp = right.csdp;
    csdm = right.csdm;
    cif  = right.cif;
    cig  = right.cig;
    xl   = right.xl;
    yl   = right.yl;
    xu   = right.xu;
    yu   = right.yu; 
    d2wmax = right.d2wmax;
  }
  return *this;
}

---

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

• G4PionRadiativeDecayChannel.hh
• G4PionRadiativeDecayChannel.cc