5b. Particles Flashcards
1
Q
Lepton number
A
The number associated with electrons, muons, taus and their neutrinos. An electron has a lepton number of +1 and an anti electron has a lepton number of -1.
2
Q
Baryon number
A
The number associated with baryons (eg. protons and neutrons). A neutron has a baryon number of 1 and an anti neutron has a baryon number of -1.
3
Q
Isotope
A
An atom with the same number of proton, but a different number of neutrons.
4
Q
Annihilation
A
Where a particle meets its anti particle and are converted into 2 gamma photons.
5
Q
The weak force
A
The force responsible for beta decay - the force carrier is the W boson.
6
Q
The strong force
A
The force that holds baryons together in the nucleus. It has a range of 2-3 fm and it’s force carrier is the virtual pion.
