A subatomic particle having the same mass as a given particle but opposite electric or magnetic properties. Every kind of subatomic particle has a corresponding antiparticle, e.g., the positron has the same mass as the electron but an equal and opposite charge.
- Positively charged beta particles, the antiparticle of electrons, are called positrons.
- Some neutral particles such as photons are their own antiparticles, while others like neutrons have antiparticles with opposite magnetic moments.
- Note that subatomic particles sometimes have antiparticles, with opposite charge and spin, that are the same ones going backwards in time.
For editors and proofreaders
Definition of antiparticle in:
What do you find interesting about this word or phrase?
Comments that don't adhere to our Community Guidelines may be moderated or removed.