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positron
(redirected from antielectron)

    Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson 0.06 sec.
positron: see antiparticle antimatter, composed of atoms made up of antiprotons and antineutrons in a nucleus surrounded by positrons. A very simple type of "atom" incorporating antiparticles is positronium, a brief pairing of a positron and an electron that may occur before their annihilation.
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positron

Subatomic particle having the same mass as an electron but with an electric charge of +1 (an electron has a charge of −1). It constitutes the antiparticle (see antimatter) of an electron. The existence of the positron was a consequence of the electron theory of P.A.M. Dirac (1928), and the particle was discovered in cosmic rays by Carl D. Anderson (1905–1991) in 1932. Though they are stable in a vacuum, positrons react quickly with the electrons of ordinary matter, producing gamma rays by the process of annihilation. They are emitted in positive beta decay of proton-rich radioactive nuclei and are formed in pair production.
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To make the first antimatter atoms that move slowly enough to be studied, physicists combined ultracold antiprotons and antielectrons into atoms of antihydrogen.
Slow winners. (Science News of the year: the weekly newsmagazine of ... by Science News
In at least one case, an antielectron began orbiting an antiproton and created - briefly - antihydrogen.
Atom's opposite by Costello, Emily / Science World
20), each of which consists of a negatively charged antiproton orbited by one positively charged antielectron, or positron.
Putting the brakes on antihydrogen. (Physics) by Science News
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