对质子电荷半径的探索

摘要：

氢原子光谱中的一个轻微异常导致Willis E.兰姆对质子大小的研究。结果，他发现了2S 1/2能级的移动，这是量子电动力学的第一个实验证明。作为回报，QED的现代测试得出了质子电荷半径的新值。这听起来像是男爵Muenchausens的故事：抓住自己的头发把自己从沼泽中拉出来。独立的方法是必要的。μ介子氢光谱学起了辅助作用。然而，高精度的结果与以前的电子值有很大的不同：这是质子半径之谜。这个难题在实验工作和理论上都产生了长达十年的活动。即使这个难题似乎已经解决，质子电荷半径的精确测定还需要未来的进一步努力。

英文摘要：

A slight anomaly in optical spectra of the hydrogen atom led Willis E. Lamb to the search for the proton size. As a result, he found the shift of the 2S1/2 level, the first experimental demonstration of quantum electrodynamics. In return, a modern test of QED yielded a new value of the charge radius of the proton. This sounds like Baron Muenchausens tale: to pull oneself out from the marsh by seizing his own hair. An independent method was necessary. Muonic hydrogen spectroscopy came to the aid. However, the high-precision result significantly differed from the previous, electronic, values: this is the proton radius puzzle. This puzzle produced a decade-long activity both in experimental work and in theory. Even if the puzzle seems to be solved, the precise determination of the proton charge radius requires further efforts in the future.

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