Proton Radius: A Puzzle or a Solution!?
Proton Radius: A Puzzle or a Solution!?
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质子半径：难题还是解决方案！？
DOI：
10.1088/1742-6596/2391/1/012017
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Jentschura, Ulrich D.
中科院分区：
文献类型：
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作者：
Jentschura, Ulrich D.
质子半径之谜被称为质子半径的差异，从μ子氢光谱学获得（大致等于0.84 fm），以及从（普通）氢光谱学获得的质子半径，其中涉及高激发态的许多测量传统上倾向于约0.88 fm的值。最近，慕尼黑（Garching）小组（特别是2S-4 P的几个超精细分辨子能级）和多伦多大学小组（2S-2 P 1/2）对氢跃迁进行了大量测量，得到了与约0.84 fm的较小质子半径一致的跃迁频率数据。最近，科罗拉多州立大学的一个小组对2S-8D跃迁进行了测量，得出质子半径约为0.86 fm，介于上述两个结果之间。目前的情况表明，质子半径之谜可能有一个纯实验性的解决方案。然而，仔细观察情况表明，情况可能有点不太清楚，提出了质子半径之谜是否已经最终解决的问题，并在TRIUMF/ARIEL打开了有趣的实验可能性。
The proton radius puzzle is known as the discrepancy of the proton radius, obtained from muonic hydrogen spectroscopy (obtained as being roughly equal to 0.84 fm), and the proton radius obtained from (ordinary) hydrogen spectroscopy where a number of measurements involving highly excited states have traditionally favored a value of about 0.88 fm. Recently, a number of measurements of hydrogen transitions by the Munich (Garching) groups (notably, several hyperfine-resolved sublevels of the 2S–4P) and by the group at the University of Toronto (2S–2P 1/2) have led to transition frequency data consistent with the smaller proton radius of about 0.84 fm. A recent measurement of the 2S–8D transition by a group at Colorado State University leads to a proton radius of about 0.86 fm, in between the two aforementioned results. The current situation points to a possible, purely experimental, resolution of the proton radius puzzle. However, a closer look at the situation reveals that the situation may be somewhat less clear, raising the question of whether or not the proton radius puzzle has been conclusively solved, and opening up interesting experimental possiblities at TRIUMF/ARIEL.
低成本μ介子源
DOI：
10.1109/pac.2001.986745
发表时间：
2001
期刊：
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
影响因子：
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作者：
V. Balbekov;N. Mokhov
通讯作者：
N. Mokhov