#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="", const G4String &theDaughterName5="")

virtual	~G4VDecayChannel ()

G4bool	operator== (const G4VDecayChannel &r) const

G4bool	operator!= (const G4VDecayChannel &r) const

G4bool	operator< (const G4VDecayChannel &right) const

virtual G4DecayProducts *	DecayIt (G4double parentMass=-1.0)=0

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 ()

G4double	GetRangeMass () const

void	SetRangeMass (G4double val)

virtual G4bool	IsOKWithParentMass (G4double parentMass)

void	SetPolarization (const G4ThreeVector &)

const G4ThreeVector &	GetPolarization () const

Protected Member Functions
	G4NeutronBetaDecayChannel ()

	G4NeutronBetaDecayChannel (const G4NeutronBetaDecayChannel &)

G4NeutronBetaDecayChannel &	operator= (const G4NeutronBetaDecayChannel &)

Protected Member Functions inherited from G4VDecayChannel
void	ClearDaughtersName ()

void	CheckAndFillDaughters ()

void	CheckAndFillParent ()

G4double	DynamicalMass (G4double massPDG, G4double width, G4double maxDev=1.0) const

	G4VDecayChannel ()

	G4VDecayChannel (const G4VDecayChannel &)

G4VDecayChannel &	operator= (const G4VDecayChannel &)

Protected Attributes
const G4double	aENuCorr = -0.102

Protected Attributes inherited from G4VDecayChannel
G4String	kinematics_name = ""

G4double	rbranch = 0.0

G4String *	parent_name = nullptr

G4String **	daughters_name = nullptr

G4double	rangeMass = 2.5

G4ThreeVector	parent_polarization

G4ParticleTable *	particletable = nullptr

G4ParticleDefinition *	G4MT_parent = nullptr

G4ParticleDefinition **	G4MT_daughters = nullptr

G4double	G4MT_parent_mass = 0.0

G4double *	G4MT_daughters_mass = nullptr

G4double *	G4MT_daughters_width = nullptr

G4Mutex	daughtersMutex

G4Mutex	parentMutex

G4int	numberOfDaughters = 0

G4int	verboseLevel = 1

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

Detailed Description

Definition at line 42 of file G4NeutronBetaDecayChannel.hh.

Constructor & Destructor Documentation

◆ G4NeutronBetaDecayChannel() [1/3]

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

Definition at line 47 of file G4NeutronBetaDecayChannel.cc.

  : G4VDecayChannel("Neutron Decay")
{
  // 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::~G4NeutronBetaDecayChannel ( )

virtual

Definition at line 84 of file G4NeutronBetaDecayChannel.cc.

85{

86}

◆ G4NeutronBetaDecayChannel() [2/3]

G4NeutronBetaDecayChannel::G4NeutronBetaDecayChannel ( )

protected

Definition at line 42 of file G4NeutronBetaDecayChannel.cc.

  : G4VDecayChannel()
{
}

◆ G4NeutronBetaDecayChannel() [3/3]

G4NeutronBetaDecayChannel::G4NeutronBetaDecayChannel ( const G4NeutronBetaDecayChannel & right )

protected

Definition at line 88 of file G4NeutronBetaDecayChannel.cc.

  : G4VDecayChannel(right)
{
}

Member Function Documentation

◆ DecayIt()

G4DecayProducts * G4NeutronBetaDecayChannel::DecayIt ( G4double )

virtual

Implements G4VDecayChannel.

Definition at line 125 of file G4NeutronBetaDecayChannel.cc.

{
  //  This class describes free neutron beta decay kinematics.
  //  This version neglects neutron/electron polarization  
  //  without Coulomb effect
 
#ifdef G4VERBOSE
  if (GetVerboseLevel()>1) G4cout << "G4NeutronBetaDecayChannel::DecayIt ";
#endif
 
  CheckAndFillParent();
  CheckAndFillDaughters();
 
  // 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;
  const std::size_t MAX_LOOP=10000;
  for (std::size_t loop_counter=0; loop_counter<MAX_LOOP; ++loop_counter)
  {
    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);
    if  (r > r0) break;
  }  
 
  // 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);
  direction2 = rm * direction2;
  G4DynamicParticle* daughterparticle2 
    = new G4DynamicParticle( G4MT_daughters[2], direction2*pP);
  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;
}

◆ operator=()

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

protected

Definition at line 94 of file G4NeutronBetaDecayChannel.cc.

{
  if (this != &right)
  { 
    kinematics_name = right.kinematics_name;
    verboseLevel = right.verboseLevel;
    rbranch = right.rbranch;
 
    // copy parent name
    delete parent_name;
    parent_name = new G4String(*right.parent_name);
 
    // clear daughters_name array
    ClearDaughtersName();
 
    // recreate array
    numberOfDaughters = right.numberOfDaughters;
    if ( numberOfDaughters >0 )
    {
      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;
}

Member Data Documentation

◆ aENuCorr

const G4double G4NeutronBetaDecayChannel::aENuCorr = -0.102

protected

Definition at line 60 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

◆ G4NeutronBetaDecayChannel() [1/3]

◆ ~G4NeutronBetaDecayChannel()

◆ G4NeutronBetaDecayChannel() [2/3]

◆ G4NeutronBetaDecayChannel() [3/3]

Member Function Documentation

◆ DecayIt()

◆ operator=()

Member Data Documentation

◆ aENuCorr