Antimatter is a basic part of the universe; protons, for example, have antiprotons which have a negative charge. When a proton and an antiproton collide, they “vanish in flashes of energy” (url 1). In nature, antiprotons occur when when cosmic rays hit atoms. The atoms break apart into particles, some of which will be antiprotons.
In the lab, scientists “throw” electrons or protons at a stationary target at incredibly high speeds. The target is made of atoms with a high atomic number (the atomic number is the number of protons in the nucleus of the atom). These collisions do not always result in antimatter.
Massless particles can break into their component matter and antimatter parts — a photon into an electron and positron (anti-electron), for example. A gluon, likewise, can help create anti-protons, if three antiquarks happen to combine. These individual particles are, using magnets, separated and isolated, then combined to form larger anti-atoms like antihydrogen.
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