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Leaving cert Physics

Definitions - Particle physics

Particle physics The branch of physics that is concerned with fundamental particles and their interactions.
Big bang All the universe, space, matter, energy and time started with a huge explosion from a tiny size, called the big bang according to the theoretical model.
Cosmic rays High energy particles (mainly protons) that originate in distant parts of the universe (probably in the explosion of stars). They usually decay high in the earths atmosphere.
Linear accelerator A device that accelerates charged particles in straight lines
Synchrotron A circular accelerator of charged particles
Strong nuclear force The force that binds protons and neutrons in nuclei.
Weak nuclear force The force responsible for radioactive beta decay.
Antiparticle A particle that has the same rest mass as the corresponding particle but opposite values of all other properties, such as charge. The antiparticle that corresponds to a fundamental particle is also fundamental.
Quark A type of particle that is constituent of Hadrons (i.e, mesons and baryons). Quarks are believed to be fundamental particles.
Lepton A fundamental particle that does not feel the strong nuclear force but does feel the weak nuclear force and gravitation. charged leptons are believed to feel the electromagnetic force
What 3 types of Leptons are there believed to be ? The electron, The muon and The tau. ( Each with their corresponding neutrino)
Hadron A particle that feels the strong nuclear force.
Meson A particle that feels the strong nuclear force and according to the quark model, is composed of a quark and an anti quark
Baryons Particles that feel the strong nuclear force, according to the quark model each baryon is composed of 3 quarks.
Electron A fundamental particle that is part of every atom, the charge on an electron is e= 1.602 × 10-19 C. The electron is a member of the lepton family.
Neutrino A lepton that has zero charge and nearly zero rest mass. A different type of neutrino is associated with each type of lepton.
Antimatter This means that each particle has it's own antiparticle which is equal in mass but opposite in charge.
Pair Production The creation of a particle and it's anti particle
Pair Annihilation When a particle and an antiparticle meet and they annihilate each other.
Created by: neilkelly
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