g 类似锡的系数
Physical review letters
|April 11, 2025
概括
首次精确测量了重类锡-118离子的g因子,证实了理论预测,并测试了高原子数的量子电动力学.
科学领域:
- 原子物理 原子物理
- 量子电动力学 (QED) 是一个
- 高精度测量 高精度测量
背景情况:
- 以前的高精度g因子测量仅限于较轻的离子,如-40.
- 了解重,高电荷离子中的g因子对于测试基本理论至关重要.
研究的目的:
- 进行首次高精度测量重类离子的g因子,特别是-118.
- 测试许多电子系统的初始理论计算的准确性.
- 探索确定像微观结构常数这样的基本常数的潜力.
主要方法:
- 使用Alphatrap实验进行测量.
- 对于g因子,测量不确定性为10亿分之0.5 (ppb).
主要成果:
- 测量到的类 ^{118}Sn^{45+} 的g因子是0.6447038265(4).
- 这一结果与最先进的ab initio理论计算非常一致,该理论预测了0.6447029(8).
- 该测量将高精度的QED和多电子相互作用测试扩展到更高的原子数 (Z).
结论:
- 这项研究成功地以前所未有的精度测量了重类离子的g系数.
- 这些发现验证了复杂原子系统和QED的理论模型.
- 结果为通过与其他测量结合来独立确定细结构常数铺平了道路.
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