Word: hydrogens
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Their success in creating anti-hydrogen, the simplest form of anti-matter, was published in the journal Nature in October...
...Gabrielse team, which goes by the name of Antihydrogen Trapment Collaboration (ATRAP), was able to create an atom of anti-hydrogen, the anti-matter counterpart of hydrogen, by joining an antiproton, the counterpart of a proton, and a positron, the counterpart of an electron. Except for their charges, both the anti-proton and the positron are identical in nearly all respects to their antimatter counterparts...
...most difficult part of creating anti-hydrogen involves overcoming repulsive forces to bring together the oppositely-charged antiproton and positron...
...machine the size of a football field uses magnets to guide anti-protons into and positions together. When the two get close enough, anti-hydrogen forms...
...also said that ATRAP and ATHENA experiments differed in several notable ways, including in methods of detecting the anti-hydrogen after creation and in the quantity of positrons used...