Improved study of the antiprotonic helium hyperfine structure
Improved study of the antiprotonic helium hyperfine structure
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DOI：
10.1088/0953-4075/41/8/081008
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发表时间：
2008-04-28
影响因子：
1.6
通讯作者：
Widmann, E.
中科院分区：
文献类型：
--
作者：
Pask, T.;Barna, D.;Widmann, E.
我们报告了在 CERN 反质子减速器 (AD) 上进行的反质子氦 (n, l) = (37, 35) 超精细 (HF) 结构系统研究的初步结果。我们使用连续波 (CW) 脉冲放大激光系统和微波腔进行激光-微波-激光共振光谱测量高频跃迁频率。与我们之前的结果相比，我们激光系统的光谱线宽和稳定性的改进使这些测量的精度提高了 5 倍，并将线宽减小了 3 倍。将实验测量的跃迁频率与三体 QED 计算进行比较可用于确定反质子自旋磁矩，从而测试 CPT 不变性。
We report the initial results from a systematic study of the hyperfine (HF) structure of antiprotonic helium (n, l) = (37, 35) carried out at the antiproton decelerator (AD) at CERN. We performed laser-microwave-laser resonance spectroscopy using a continuous wave (CW) pulse-amplified laser system and microwave cavity to measure the HF transition frequencies. Improvements in the spectral linewidth and stability of our laser system have increased the precision of these measurements by a factor of 5 and reduced the linewidth by a factor of 3 compared to our previous results. A comparison of the experimentally measured transition frequencies with three-body QED calculations can be used to determine the antiproton spin magnetic moment, leading towards a test of CPT invariance.