Hori M, Dax A, Eades J, Gomikawa K, Hayano R S, Ono N, Pirkl W, Widmann E, Torii H A, Juhász B, Barna D, Horváth D
CERN, CH-1211 Geneva 23, Switzerland.
Phys Rev Lett. 2006 Jun 23;96(24):243401. doi: 10.1103/PhysRevLett.96.243401. Epub 2006 Jun 19.
A femtosecond optical frequency comb and continuous-wave pulse-amplified laser were used to measure 12 transition frequencies of antiprotonic helium to fractional precisions of (9-16)x10(-9). One of these is between two states having microsecond-scale lifetimes hitherto unaccessible to our precision laser spectroscopy method. Comparisons with three-body QED calculations yielded an antiproton-to-electron mass ratio of Mp/me=1836.152674(5).
使用飞秒光学频率梳和连续波脉冲放大激光器测量了反质子化氦的12个跃迁频率，精度达到(9 - 16)×10⁻⁹的分数精度。其中一个跃迁频率存在于两个具有微秒级寿命的态之间，这是我们的精密激光光谱方法迄今无法触及的。与三体量子电动力学计算结果的比较得出反质子与电子的质量比为Mp/me = 1836.152674(5)。
