What is an antiparticle?
Q: What is an antiparticle?
A: An antiparticle is a particle with the same mass as a normal particle but with opposite electric charge.
Q: Are electrically neutral particles identical to their antiparticles?
A: Even electrically neutral particles, such as the neutron, are not identical to their antiparticle.
Q: What are particle-antiparticle pairs?
A: Particle-antiparticle pairs are particles and their corresponding antiparticles.
Q: What happens when particle-antiparticle pairs are in appropriate quantum states?
A: Particle-antiparticle pairs can annihilate each other if they are in appropriate quantum states.
Q: How are particle-antiparticle pairs produced in particle accelerators?
A: Particle-antiparticle pairs can be produced in various processes in particle accelerators to create new particles and to test theories of particle physics.
Q: Where are antiparticles visible in nature?
A: Antiparticles are visible in cosmic rays and in certain nuclear reactions.
Q: What does the word antimatter refer to?
A: The word antimatter properly refers to (elementary) antiparticles, composite antiparticles made with them (such as antihydrogen) and to larger assemblies of either.
