protonium


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protonium

[prō′tō·nē·əm]
(atomic physics)
A bound state of a proton and an antiproton.
References in periodicals archive ?
In order for the paper to be self-contained let's recall that the pionium is formed by a [[pi].sup.+] and [[pi].sup.-] mesons, the positronium is formed by an antielectron (positron) and an electron in a semi-stable arrangement, the protonium is formed by a proton and an antiproton also semi-stable, the antiprotonic helium is formed by an antiproton and electron together with the helium nucleus (semi-stable), and muonium is formed by a positive muon and an electron.
Physicists in Geneva realized that several years ago they had accidentally combined matter and antimatter into something called protonium. An elementary school science class determined that popcorn pops more efficiently and tastes better when the kernels are first sent into space; Air Force scientists concluded that a ring of super-conducting magnets could fling satellites into orbit, or weapons across continents; and roboticists successfully programmed a swarm of dumb robots to move an object decorated with red lights across a floor toward a white target.
In a second phase, it will study protonium, a hydrogen-like atom made of a proton and an antiproton.
Another possibility is the making of protonium, a system in which a proton and an antiproton are bound together and orbit each other.