JSci.physics.particles.Positron Maven / Gradle / Ivy
package JSci.physics.particles;
import JSci.physics.quantum.QuantumParticle;
/**
* A class representing positrons.
* @version 1.5
* @author Mark Hale
*/
public final class Positron extends AntiLepton {
/**
* Constructs a positron.
*/
public Positron() {}
/**
* Returns the rest mass (MeV).
* @return 0.510998902
*/
public double restMass() {return 0.510998902;}
/**
* Returns the electric charge.
* @return 1
*/
public int charge() {return 1;}
/**
* Returns the electron lepton number.
* @return -1
*/
public int eLeptonQN() {return -1;}
/**
* Returns the muon lepton number.
* @return 0
*/
public int muLeptonQN() {return 0;}
/**
* Returns the tau lepton number.
* @return 0
*/
public int tauLeptonQN() {return 0;}
/**
* Returns the antiparticle of this particle.
*/
public QuantumParticle anti() {
return new Electron();
}
/**
* Returns true if qp is the antiparticle.
*/
public boolean isAnti(QuantumParticle qp) {
return (qp!=null) && (qp instanceof Electron);
}
/**
* Returns a string representing this class.
*/
public String toString() {
return new String("Positron");
}
/**
* Emits a photon.
*/
public Positron emit(Photon y) {
momentum=momentum.subtract(y.momentum);
return this;
}
/**
* Absorbs a photon.
*/
public Positron absorb(Photon y) {
momentum=momentum.add(y.momentum);
return this;
}
/**
* Emits a W+.
*/
public AntiElectronNeutrino emit(WPlus w) {
AntiElectronNeutrino n=new AntiElectronNeutrino();
n.momentum=momentum.subtract(w.momentum);
return n;
}
/**
* Absorbs a W-.
*/
public AntiElectronNeutrino absorb(WMinus w) {
AntiElectronNeutrino n=new AntiElectronNeutrino();
n.momentum=momentum.add(w.momentum);
return n;
}
/**
* Emits a Z0.
*/
public Positron emit(ZZero z) {
momentum=momentum.subtract(z.momentum);
return this;
}
/**
* Absorbs a Z0.
*/
public Positron absorb(ZZero z) {
momentum=momentum.add(z.momentum);
return this;
}
}