Word: antiproton
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Dates: during 1990-1999
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Because matter and antimatter annihilate each other upon contact, Gabrielse and Khabbaz isolated the antiproton in an electric and magnetic field to prevent it from touching any matter during the experiment...
...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...
FOOTNOTE: *Antiprotons and positrons are examples of antimatter, a rare set of particles that mirror normal matter. A proton is positively charged, but an antiproton is negative. The counterpart of the negative electron is the positive positron...