antiparticle

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antiparticle

 [an″tĭ-pahr´tĭ-k'l]
either of a pair of elementary particles that have electric charges and magnetic moments of opposite sign and are the same in all other properties, such as mass, lifetime, and spin, e.g., the electron and positron. Every particle has an antiparticle. When antiparticles collide, they are annihilated, and their mass is converted to energy in the form of gamma rays.
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References in periodicals archive ?
A new form of matter--unmatter, composed of particles and anti-particles. Progress in Physics, 2005, v.
One means, rather, a "quantum nothing" in which nothing exists except for the tiny particles and their anti-particles that constantly pop out of the vacuum and then immediately disappear.
Sanda and his collaborators29) who noticed in 1980 the possibility of B-meson mixing with its anti-particle and also the possibility of observing CP violation in B-meson decay within the frame work of the Kobayashi-Maskawa theory well before the discovery of B-meson mixing.
"At the beginning of time, in the Big Bang, a soup of particles and anti-particles was created, but somehow an imbalance came about," said Karsten Heeger, a professor of physics at the University of Wisconsin-Madison.
(3) According to Table 1 of Part I, Line B, there are three additional leptons in addition to the electron (or its anti-particle positron).
Of those models the Brightsen model has a chance to be tested in such way, because it includes unmatter entities (the conjugations of particles and anti-particles) inside an atomic nucleus that could produce effect in the forming of orthopositronium by [[beta].sup.+]-decay positrons and its annihilation.
The physicists analyzed more precisely the yields of a number of particles and anti-particles. "Our investigations revealed a number of surprizing discoveries.
Even empty space is not empty--at the quantum level, small fluctuations in the vacuum energy cause particles and anti-particles to be created in pairs.
Antimatter consists of anti-particles in the same way as normal matter (atoms, molecules) consists of particles.