G4NeutronDecay Class Reference

#include <G4NeutronDecay.hh>

Inheritance diagram for G4NeutronDecay:

Collaboration diagram for G4NeutronDecay:

Public Member Functions
	G4NeutronDecay (const G4ParticleDefinition *theParentNucleus, const G4double &theBR, const G4double &Qvalue, const G4double &excitation)
virtual	~G4NeutronDecay ()
virtual G4DecayProducts *	DecayIt (G4double)
virtual void	DumpNuclearInfo ()
Public Member Functions inherited from G4NuclearDecay
	G4NuclearDecay (const G4String &channelName, const G4RadioactiveDecayMode &mode, const G4double &excitation)
virtual	~G4NuclearDecay ()
G4RadioactiveDecayMode	GetDecayMode ()
G4double	GetDaughterExcitation ()
G4ParticleDefinition *	GetDaughterNucleus ()
void	SetHLThreshold (G4double HLT)
G4double	GetHLThreshold ()
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 ()
G4double	GetRangeMass () const
void	SetRangeMass (G4double val)
virtual G4bool	IsOKWithParentMass (G4double parentMass)
void	SetPolarization (const G4ThreeVector &)
const G4ThreeVector &	GetPolarization () const

Private Attributes
const G4double	transitionQ

Additional Inherited Members
Protected Member Functions inherited from G4VDecayChannel
void	ClearDaughtersName ()
void	CheckAndFillDaughters ()
void	CheckAndFillParent ()
	G4VDecayChannel ()
	G4VDecayChannel (const G4VDecayChannel &)
G4VDecayChannel &	operator= (const G4VDecayChannel &)
G4double	DynamicalMass (G4double massPDG, G4double width, G4double maxDev=+1.) const
Protected Attributes inherited from G4NuclearDecay
const G4RadioactiveDecayMode	theMode
Protected Attributes inherited from G4VDecayChannel
G4String	kinematics_name
G4double	rbranch
G4int	numberOfDaughters
G4String *	parent_name
G4String **	daughters_name
G4double	rangeMass
G4ThreeVector	parent_polarization
G4ParticleTable *	particletable
G4int	verboseLevel
G4ParticleDefinition *	G4MT_parent
G4ParticleDefinition **	G4MT_daughters
G4double	G4MT_parent_mass
G4double *	G4MT_daughters_mass
G4double *	G4MT_daughters_width
G4Mutex	daughtersMutex
G4Mutex	parentMutex
Static Protected Attributes inherited from G4VDecayChannel
static const G4String	noName = " "

Detailed Description

Definition at line 44 of file G4NeutronDecay.hh.

Constructor & Destructor Documentation

G4NeutronDecay()

G4NeutronDecay::G4NeutronDecay	(	const G4ParticleDefinition *	theParentNucleus,
		const G4double &	theBR,
		const G4double &	Qvalue,
		const G4double &	excitation
	)

Definition at line 45 of file G4NeutronDecay.cc.

 : G4NuclearDecay("neutron decay", Neutron, excitationE), transitionQ(Qvalue)
{
  SetParent(theParentNucleus);  // Store name of parent nucleus, delete G4MT_parent
  SetBR(branch);

  SetNumberOfDaughters(2);
  G4IonTable* theIonTable =
    (G4IonTable*)(G4ParticleTable::GetParticleTable()->GetIonTable());
  G4int daughterZ = theParentNucleus->GetAtomicNumber();
  G4int daughterA = theParentNucleus->GetAtomicMass() - 1;
  SetDaughter(0, theIonTable->GetIon(daughterZ, daughterA, excitationE) );
  SetDaughter(1, "neutron");
}

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~G4NeutronDecay()

G4NeutronDecay::~G4NeutronDecay ( )

virtual

Definition at line 63 of file G4NeutronDecay.cc.

{}

Member Function Documentation

DecayIt()

G4DecayProducts * G4NeutronDecay::DecayIt ( G4double  )

virtual

Implements G4VDecayChannel.

Definition at line 67 of file G4NeutronDecay.cc.

{
  // Fill G4MT_parent with theParentNucleus (stored by SetParent in ctor)  
  CheckAndFillParent();

  // Fill G4MT_daughters with neutron and residual nucleus (stored by SetDaughter)  
  CheckAndFillDaughters();

  G4double neutronMass = G4MT_daughters[1]->GetPDGMass();
  // Excitation energy included in PDG mass
  G4double nucleusMass = G4MT_daughters[0]->GetPDGMass();

  // Q value was calculated from atomic masses.
  // Use it to get correct neutron energy.
  G4double cmMomentum = std::sqrt(transitionQ*(transitionQ + 2.*neutronMass)*
                                (transitionQ + 2.*nucleusMass)*
                                (transitionQ + 2.*neutronMass + 2.*nucleusMass) )/
                                (transitionQ + neutronMass + nucleusMass)/2.; 

  // Set up final state
  // parentParticle is set at rest here because boost with correct momentum 
  // is done later
  G4DynamicParticle parentParticle(G4MT_parent, G4ThreeVector(0,0,0), 0.0);
  G4DecayProducts* products = new G4DecayProducts(parentParticle);

  G4double costheta = 2.*G4UniformRand()-1.0;
  G4double sintheta = std::sqrt(1.0 - costheta*costheta);
  G4double phi  = twopi*G4UniformRand()*rad;
  G4ThreeVector direction(sintheta*std::cos(phi),sintheta*std::sin(phi),
                          costheta);

  G4double KE = std::sqrt(cmMomentum*cmMomentum + neutronMass*neutronMass)
              - neutronMass;
  G4DynamicParticle* daughterparticle =
    new G4DynamicParticle(G4MT_daughters[1], direction, KE, neutronMass);
  products->PushProducts(daughterparticle);

  KE = std::sqrt(cmMomentum*cmMomentum + nucleusMass*nucleusMass) - nucleusMass;
  daughterparticle =
    new G4DynamicParticle(G4MT_daughters[0], -1.0*direction, KE, nucleusMass);
  products->PushProducts(daughterparticle);

  // Energy conservation check
  // For neutron decays, do final energy check against reaction Q value
  // which is well-measured using atomic mass differences.  Nuclear masses
  // should not be used since they are not usually directly measured and we
  // always decay atoms and not fully stripped nuclei.
  /*
  G4int nProd = products->entries();
  G4DynamicParticle* temp = 0;
  G4double Esum = 0.0;
  for (G4int i = 0; i < nProd; i++) {
    temp = products->operator[](i);
    Esum += temp->GetKineticEnergy();
  }
  G4double eCons = (transitionQ - Esum)/keV;
  if (eCons > 1.e-07) G4cout << " Neutron decay check: Ediff (keV) = " << eCons << G4endl;
  */
  return products;
}

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DumpNuclearInfo()

void G4NeutronDecay::DumpNuclearInfo ( )

virtual

Implements G4NuclearDecay.

Definition at line 129 of file G4NeutronDecay.cc.

{
  G4cout << " G4NeutronDecay for parent nucleus " << GetParentName() << G4endl;
  G4cout << " decays to " << GetDaughterName(0) << " + " << GetDaughterName(1)
         << " with branching ratio " << GetBR() << "% and Q value "
         << transitionQ << G4endl;
}

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Member Data Documentation

transitionQ

const G4double G4NeutronDecay::transitionQ

private

Definition at line 58 of file G4NeutronDecay.hh.

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

• G4NeutronDecay.hh
• G4NeutronDecay.cc