GoKawiilNorthwestern Physicists Isolate Single Positron in Trap for One Month
A Northwestern University team led by Gerald Gabrielse trapped an individual positron, the antimatter counterpart of the electron, for a full month. They generated it from decaying sodium-22 atoms, slowed it using a cold tungsten crystal, then confined it in a near-absolute-zero vacuum using combined electric and magnetic fields with no physical walls. The result was published in Physical Review Letters.
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The sustained isolation of a single positron could allow unusually precise measurement of its magnetic moment, which researchers could compare against the electron's to test fundamental symmetries between matter and antimatter. Scientific American suggests such work might eventually help explain why the universe appears to be composed overwhelmingly of matter rather than antimatter, though that remains a long-term aspiration rather than a demonstrated result.
- A single positron was trapped continuously for a month using electromagnetic confinement.
- The technique uses decaying sodium-22 atoms and a tungsten crystal to generate and slow the antimatter particles.
- Future precision measurements of the positron's magnetic moment could probe matter-antimatter asymmetry.
Source: science.slashdot.org, 2026-10-23
Published there as: “Physicists Trap a Single Antimatter Particle For a Month”
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