Word: antiproton
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...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...
...weeks before, on Sep. 18, a competing group, called ATHENA, which also uses the accelerator at CERN, announced that they had succeeded in joining an antiproton and a positron. This group is composed of mainly European scientists, who had not been serious competition for the Harvard group before...
...measured the radio station that is one antiproton...and we listened to one proton...and we compared back and forth to see if they have the same oscillation ion frequency in the same field [to determine] if they have the same properties," Gabrielse said...
...What we were able to do at an unprecedented level of accuracy [was] to tell that the proton and antiproton have the same frequency," Gabrielse said...