Laser spectroscopy of muonic deuterium
Laser spectroscopy of muonic deuterium
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DOI：
10.1126/science.aaf2468
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发表时间：
2016-08-12
期刊：
影响因子：
56.9
通讯作者：
Antognini, Aldo
中科院分区：
文献类型：
--
作者：
Pohl, Randolf;Nez, Francois;Antognini, Aldo
Deuteron是最简单的化合物核，由一个质子和一个中子组成。 Deuteron的性质，例如根平方电荷半径R（D）和极化性是理解核力量和结构的重要基准。 Muonic氘含量是由Deuteron和负Muon Mu-形成的异国原子。我们在MD中测量了三个2S-2P转换，并获得R（d）= 2.12562（78）FM，这是准确的2.7倍，但比Codata-2010值r（d）= 2.1424（21）FM小7.5 sigma。 MD值也比电子氘光谱的RD值小3.5 sigma。较小的RD与电子同位素移位结合使用，产生了“小”质子半径R（P），类似于Muonic氢的质子半径R（P），从而扩大了质子半径拼图。
The deuteron is the simplest compound nucleus, composed of one proton and one neutron. Deuteron properties such as the root-mean-square charge radius r(d) and the polarizability serve as important benchmarks for understanding the nuclear forces and structure. Muonic deuterium mu d is the exotic atom formed by a deuteron and a negative muon mu-. We measured three 2S-2P transitions in md and obtain r(d) = 2.12562(78) fm, which is 2.7 times more accurate but 7.5 sigma smaller than the CODATA-2010 value r(d) = 2.1424(21) fm. The md value is also 3.5 sigma smaller than the rd value from electronic deuterium spectroscopy. The smaller rd, when combined with the electronic isotope shift, yields a "small" proton radius r(p), similar to the one from muonic hydrogen, amplifying the proton radius puzzle.