2026-10-21 ノースウェスタン大学
The tank in the center of the lab, lowered beneath ground level, holds the captured positron. After capturing the fast-moving particle from radioactive decay, the scientists cooled it to nearly absolute zero. Then, they suspended the particle in a near-perfect vacuum, preventing it from touching ordinary matter — an encounter that would cause it to vanish. Photo courtesy of Gerald Gabrielse
＜関連情報＞
- https://news.northwestern.edu/stories/2026/10/scientists-trap-and-tame-a-single-particle-of-antimatter-for-months
- https://journals.aps.org/prl/abstract/10.1103/gbkc-6nlj
1陽電子量子サイクロトロン One-Positron Quantum Cyclotron
T. G. Myers, L. Soucy, B. A. D. Sukra, B. Sinha, and G. Gabrielse
Physical Review Letters Published: 21 October, 2026
DOI: https://doi.org/10.1103/gbkc-6nlj
Abstract
A one-positron quantum cyclotron is realized with a single positron suspended indefinitely in the magnetic field of a Penning trap. This opens the possibility of quantum measurements of the positron magnetic moment at a precision much higher than attained with classical cyclotron motion. Comparing the magnetic moments measured using positron and electron quantum cyclotrons should provide the most stringent test of the fundamental invariance of the standard model of particle physics in the lepton sector.
