#include <G4NeutronBetaDecayChannel.hh>

Inheritance diagram for G4NeutronBetaDecayChannel:

Public Member Functions
	G4NeutronBetaDecayChannel (const G4String &theParentName, G4double theBR)

virtual	~G4NeutronBetaDecayChannel ()

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
	G4NeutronBetaDecayChannel (const G4NeutronBetaDecayChannel &)

G4NeutronBetaDecayChannel &	operator= (const G4NeutronBetaDecayChannel &)

	G4NeutronBetaDecayChannel ()

Protected Member Functions inherited from G4VDecayChannel
void	ClearDaughtersName ()

void	FillDaughters ()

void	FillParent ()

	G4VDecayChannel ()

	G4VDecayChannel (const G4VDecayChannel &)

G4VDecayChannel &	operator= (const G4VDecayChannel &)

Protected Attributes
const G4double	aENuCorr

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

Additional Inherited Members
Static Protected Attributes inherited from G4VDecayChannel
static const G4String	noName = " "

Detailed Description

Definition at line 43 of file G4NeutronBetaDecayChannel.hh.

Constructor & Destructor Documentation

G4NeutronBetaDecayChannel::G4NeutronBetaDecayChannel	(	const G4String &	theParentName,
		G4double	theBR
	)

Definition at line 58 of file G4NeutronBetaDecayChannel.cc.

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

                    :G4VDecayChannel("Neutron Decay"),
             aENuCorr(-0.102)
 {
   // set names for daughter particles
   if (theParentName == "neutron") {
     SetBR(theBR);
     SetParent("neutron");
     SetNumberOfDaughters(3);
     SetDaughter(0, "e-");
     SetDaughter(1, "anti_nu_e");
     SetDaughter(2, "proton");
   } else if (theParentName == "anti_neutron") {
     SetBR(theBR);
     SetParent("anti_neutron");
     SetNumberOfDaughters(3);
     SetDaughter(0, "e+");
     SetDaughter(1, "nu_e");
     SetDaughter(2, "anti_proton");
   } else {
 #ifdef G4VERBOSE
     if (GetVerboseLevel()>0) {
       G4cout << "G4NeutronBetaDecayChannel:: constructor :";
       G4cout << " parent particle is not neutron but ";
       G4cout << theParentName << G4endl;
     }
 #endif
   }
 }

G4NeutronBetaDecayChannel::~G4NeutronBetaDecayChannel ( )

virtual

Definition at line 90 of file G4NeutronBetaDecayChannel.cc.

91 {

92 }

G4NeutronBetaDecayChannel::G4NeutronBetaDecayChannel ( const G4NeutronBetaDecayChannel & right )

protected

Definition at line 94 of file G4NeutronBetaDecayChannel.cc.

     : G4VDecayChannel(right),
       aENuCorr(-0.102)
 {
 }

G4NeutronBetaDecayChannel::G4NeutronBetaDecayChannel ( )

protected

Definition at line 52 of file G4NeutronBetaDecayChannel.cc.

                    :G4VDecayChannel(),
             aENuCorr(-0.102)
 {
 }

Member Function Documentation

G4DecayProducts * G4NeutronBetaDecayChannel::DecayIt ( G4double )

virtual

Implements G4VDecayChannel.

Definition at line 128 of file G4NeutronBetaDecayChannel.cc.

References aENuCorr, 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::HepRotation::rotateY(), CLHEP::HepRotation::rotateZ(), python.hepunit::twopi, and test::x.

 {
   //  This class describes free neutron beta decay  kinemtics.
   //  This version neglects neutron/electron polarization  
   //  without Coulomb effect
 
 #ifdef G4VERBOSE
   if (GetVerboseLevel()>1) G4cout << "G4NeutronBetaDecayChannel::DecayIt ";
 #endif
 
   if (G4MT_parent == 0) FillParent();  
   if (G4MT_daughters == 0) FillDaughters();
  
   // parent mass
   G4double parentmass = G4MT_parent->GetPDGMass();
 
   //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 xmax = parentmass-sumofdaughtermass;  
 
    //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;
 
   // calculate daughter momentum
   G4double daughtermomentum[3];
 
   // calcurate electron energy
   G4double x;                    // Ee
   G4double p;                    // Pe
   G4double dm = daughtermass[0]; //Me
   G4double w;                    // cosine of e-nu angle
   G4double r;  
   G4double r0;
   do {
       x = xmax*G4UniformRand();
       p = std::sqrt(x*(x+2.0*dm));
       w = 1.0-2.0*G4UniformRand();
       r = p*(x+dm)*(xmax-x)*(xmax-x)*(1.0+aENuCorr*p/(x+dm)*w);
       r0 = G4UniformRand()*(xmax+dm)*(xmax+dm)*xmax*xmax*(1.0+aENuCorr);
   } while (r < r0);    
 
 
   //create daughter G4DynamicParticle 
   // rotation materix to lab frame
   G4double costheta = 2.*G4UniformRand()-1.0;
   G4double theta = std::acos(costheta)*rad;
   G4double phi  = twopi*G4UniformRand()*rad;
   G4RotationMatrix rm;
   rm.rotateY(theta);
   rm.rotateZ(phi);
 
   // daughter 0 (electron) in Z direction
   daughtermomentum[0] = p;
   G4ThreeVector direction0(0.0, 0.0, 1.0);
   direction0 = rm * direction0;
   G4DynamicParticle * daughterparticle0 
          = new G4DynamicParticle( G4MT_daughters[0], direction0*daughtermomentum[0]);
   products->PushProducts(daughterparticle0);
 
   // daughter 1 (nutrino) in XZ plane
   G4double eNu;    // Enu
   eNu = (parentmass-daughtermass[2])*(parentmass+daughtermass[2])+(dm*dm)-2.*parentmass*(x+dm);
   eNu /= 2.*(parentmass+p*w-(x+dm));
   G4double cosn = w;
   G4double phin  = twopi*G4UniformRand()*rad;
   G4double sinn = std::sqrt((1.0-cosn)*(1.0+cosn));
 
   G4ThreeVector direction1(sinn*std::cos(phin), sinn*std::sin(phin), cosn);
   direction1 = rm * direction1;
   G4DynamicParticle * daughterparticle1 
          = new G4DynamicParticle( G4MT_daughters[1], direction1*eNu);
   products->PushProducts(daughterparticle1);
 
   // daughter 2 (proton) at REST
   G4double eP;     // Eproton
   eP = parentmass-eNu-(x+dm)-daughtermass[2];
   G4double pPx = -eNu*sinn;
   G4double pPz = -p-eNu*cosn;
   G4double pP  = std::sqrt(eP*(eP+2.*daughtermass[2]));
   G4ThreeVector direction2(pPx/pP*std::cos(phin), pPx/pP*std::sin(phin), pPz/pP);
     G4DynamicParticle * daughterparticle2 
          = new G4DynamicParticle( G4MT_daughters[2], direction2);
   products->PushProducts(daughterparticle2);
  
 
  // output message
 #ifdef G4VERBOSE
   if (GetVerboseLevel()>1) {
     G4cout << "G4NeutronBetaDecayChannel::DecayIt ";
     G4cout << "  create decay products in rest frame " <<G4endl;
     products->DumpInfo();
   }
 #endif
   return products;
 }

G4NeutronBetaDecayChannel & G4NeutronBetaDecayChannel::operator= ( const G4NeutronBetaDecayChannel & right )

protected

Definition at line 101 of file G4NeutronBetaDecayChannel.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]);
       }
     }
   }
   return *this;
 }

Field Documentation

const G4double G4NeutronBetaDecayChannel::aENuCorr

protected

Definition at line 70 of file G4NeutronBetaDecayChannel.hh.

Referenced by DecayIt().

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

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Field Documentation