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Researchers examine a Penning trap used to measure the magnetic charge of an antiproton.

Photo of  researchers examining a tubular structure to measure the magnetic charge of an antiproton.

Trying to learn more about the surprising imbalance of matter and antimatter in the universe, members of the ATRAP team used a cryogenic trap apparatus to suspend a single antiproton for weeks at a time while they measured the size of its magnet 680 times more precisely than had been possible with other methods. From left to right Mason Marshall, Kathryn Marable, Gerald Gabrielse and Jack DiSciacca.

Credit: Katherine Taylor/Harvard Public Affairs

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Related story: NSF Team Measures Antiproton's Magnetic Charge 680 Times More Precisely Than in Past Efforts