Word: experimention
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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.
The experiment indicated that antiprotons and protons do oscillate at the same frequency and thus suggests that they have the same properties.
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 of the ion.
Although the experiment was led by