#positron

• Antiparticle — An elementary particle that has exactly the same mass, lifetime, and spin as a corresponding particle of ordinary matter, but whose electric charges, quantum numbers, and magnetic moments have opposite mathematical signs. Upon direct contact between a particle and an antiparticle, the structural phenomenon of mutual annihilation occurs, converting their entire mass into energy in the form of high-frequency photons.
• Antisubstance — A hypothetical or experimental form of matter composed entirely of antiparticles (such as antiprotons, antineutrons, and positrons), representing the structural inverse equivalent of ordinary matter. Upon direct contact between a substance and an antisubstance, the physical process of total annihilation occurs, instantly converting the entire mass of both entities into pure energy in the form of high-intensity gamma rays.