The Rydberg constant and proton size from atomic hydrogen
The Rydberg constant and proton size from atomic hydrogen
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DOI：
10.1126/science.aah6677
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发表时间：
2017-10-06
期刊：
影响因子：
56.9
通讯作者：
Udem, Thomas
中科院分区：
文献类型：
--
作者：
Beyer, Axel;Maisenbacher, Lothar;Udem, Thomas
“质子半径之谜”的核心是由规则氢原子(H)和介子氢原子(Mup)确定的质子均方根电荷半径(r(P))之间的四个标准差。利用H原子束，测量了H原子的2S-4P跃迁频率，得到里德堡常数R-无穷大=10973731.568076(96)/米，r(P)=0.8335(95)毫微米。我们的r(P)值是3.3个组合标准差，比之前的H World数据小，但与mup值很好地一致。我们提出了一种非对称的拟合函数，它消除了相邻原子共振的量子干涉产生的线移。
At the core of the "proton radius puzzle" is a four-standard deviation discrepancy between the proton root-mean-square charge radii (r(p)) determined from the regular hydrogen (H) and the muonic hydrogen (mu p) atoms. Using a cryogenic beam of H atoms, we measured the 2S-4P transition frequency in H, yielding the values of the Rydberg constant R-infinity = 10973731.568076(96) per meter and r(p) = 0.8335(95) femtometer. Our r(p) value is 3.3 combined standard deviations smaller than the previous H world data, but in good agreement with the mu p value. We motivate an asymmetric fit function, which eliminates line shifts from quantum interference of neighboring atomic resonances.