Word: khabbaz
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Dates: during 1990-1999
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...This experiment has been done before but to less accuracy than we achieved this time," Khabbaz said. "We improved the measurement by about a factor of one million...
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...
Gabrielse and Khabbaz then added a negative hydrogen ion--a proton with two electrons around it--to the field. While the two particles moved in circular orbits, Gabrielse and Khabbaz measured the frequency at which each of the particles oscillated with a very sensitive radio...
Gabrielse and Khabbaz used a negative hydrogen ion instead of a proton in the experiment because it allowed for greater accuracy of measurement after correcting for the additional electrons...
Gabrielse and Khabbaz worked in collaborationwith the University of Bonn...