OMSimIBD Class Reference

Class in charge of generating positrons from IBD of supernova antineutrino interactions. More...

Inheritance diagram for OMSimIBD:

Collaboration diagram for OMSimIBD:

Detailed Description

Supported by OMSimSNTools, this class generates the corresponding positrons after the inverse beta decay and weights the interactions corresponding to the cross section and the generated volume

Public Member Functions
	OMSimIBD (G4ParticleGun *)
	Constructor of OMSimIBD class.
Public Member Functions inherited from SNBaseParticleGenerator
	SNBaseParticleGenerator (G4ParticleGun *)
void	GeneratePrimaries (G4Event *anEvent)

Private Member Functions
void	initialiseParticle ()
DistributionSampler	angularDistribution (G4double Enu)
	Computes the angular distribution of the reaction ( \bar{\nu}_e + p \rightarrow e^+ + n ).
G4double	calculateSecondaryParticleEnergy (G4double nu_energy, G4double costheta)
	Computes the energy of a positron resulting from the inverse beta decay.
G4double	totalCrossSection (G4double energy)
	Calculates the total cross-section of the inverse beta decay reaction for a given energy.

Additional Inherited Members
Protected Member Functions inherited from SNBaseParticleGenerator
void	initialiseDistribution (int column, int targets)
G4double	calculateNeutrinoEnergy ()
G4ThreeVector	calculateMomentumDirection (G4double pNeutrinoEnergy)
G4double	calculateWeight (G4double pNuEnergy)
Protected Attributes inherited from SNBaseParticleGenerator
G4ParticleGun *	m_particleGun
OMSimSNTools	m_SNToolBox
const G4double	m_Gf = 1.166e-5 * 1e-6 / (MeV * MeV)
const G4double	m_Consg = 1.26
const G4double	m_deltaMass = neutron_mass_c2 - proton_mass_c2
const G4double	m_massSquaredDifference = (pow(m_deltaMass, 2) - pow(electron_mass_c2, 2)) / 2.
G4double	m_NrTargets
DistributionSampler	m_timeDistribution
DistributionSampler	m_meanEnergyDistribution
DistributionSampler	m_meanEnergySquaredDistribution

Constructor & Destructor Documentation

OMSimIBD()

OMSimIBD::OMSimIBD

(

G4ParticleGun *

p_gun

)

Parameters

p_gun

Pointer to the particle p_gun object used for simulation.

Member Function Documentation

angularDistribution()

DistributionSampler OMSimIBD::angularDistribution ( G4double  p_energy )

privatevirtual

This function evaluates the angular distribution of the positron based on the energy of the incident electronic antineutrino. The calculation follows the theoretical approach outlined in "The angular distribution of the reaction \‍( \bar{\nu}_e + p \rightarrow e^+ + n \‍)" by P. Vogel and J. F. Beacom (1999), specifically referencing Eq. 14.

Parameters

p_energy

Energy of the incoming electronic antineutrino.

Note

This function populates the xAngularDistribution and yAngularDistribution vectors, which later can be used in other parts of the simulation.

Implements SNBaseParticleGenerator.

calculateSecondaryParticleEnergy()

G4double OMSimIBD::calculateSecondaryParticleEnergy ( G4double  p_energy, G4double  p_cosTheta  )

privatevirtual

Given the energy of the incident electronic antineutrino and the scatter angle, this function calculates the energy of the emitted positron following inverse beta decay. The theoretical basis for this calculation is given in "The angular distribution of the reaction \‍( \nu_e + p \rightarrow e^+ + n \‍)" by P. Vogel and J. F. Beacom (1999), specifically referencing Eq. 13.

Parameters

p_energy	Energy of the incoming electronic antineutrino.
p_cosTheta	Cosine of the scatter angle between the direction of the antineutrino's momentum and the positron's momentum.

Returns

Energy of the emitted positron as a result of the inverse beta decay process. @reference P. Vogel, J. F. Beacom. (1999). The angular distribution of the reaction ( \nu_e + p \rightarrow e^+ + n ). Phys.Rev., D60, 053003

Implements SNBaseParticleGenerator.

initialiseParticle()

void OMSimIBD::initialiseParticle ( )

privatevirtual

Implements SNBaseParticleGenerator.

totalCrossSection()

G4double OMSimIBD::totalCrossSection ( G4double  p_energy )

privatevirtual

This function estimates the total cross-section of the inverse beta decay, which can be used to weigh each event. The theoretical basis for this calculation is presented in "Future detection of supernova neutrino burst and explosion mechanism" by T. Totani, K. Sato, H. E. Dalhed, and J. R. Wilson (1998), specifically referencing Equation 9.

Parameters

p_energy

Energy of the incoming electronic antineutrino.

Returns

Total cross-section for the given energy. @reference T. Totani, K. Sato, H. E. Dalhed, J. R. Wilson, "Future detection of supernova neutrino burst and explosion mechanism", Astrophys. J. 496, 1998, 216–225, Preprint astro-ph/9710203, 1998.

Implements SNBaseParticleGenerator.

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

• OMSimSNParticleGenerators.hh
• OMSimSNParticleGenerators.cc