Laser spectroscopic characterization of the nuclear-clock isomer 229mTh
Laser spectroscopic characterization of the nuclear-clock isomer 229mTh
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DOI：
10.1038/s41586-018-0011-8
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发表时间：
2017-09
期刊：
影响因子：
64.8
通讯作者：
J. Thielking;M. Okhapkin;P. Głowacki;D. Meier;L. Wense;B. Seiferle;C. Düllmann;P. Thirolf;E. Peik
中科院分区：
文献类型：
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作者：
J. Thielking;M. Okhapkin;P. Głowacki;D. Meier;L. Wense;B. Seiferle;C. Düllmann;P. Thirolf;E. Peik
同位素229 Th是唯一一个已知在几个电子伏特的能量范围内拥有激发态229 mTh的核，这是原子价层中电子的典型跃迁能量，但比典型的核激发能低四个数量级。在已经提出的这种核系统的许多应用中，最有希望的是一种高精度的核钟，它比现有的原子计时器性能更好。在这里，我们提出的超精细结构的双charged229mTh离子的激光光谱调查和确定的基本核性质的异构体，即，它的磁偶极子和电四极矩，以及它的核电荷半径。在最近直接检测到这种长期寻求的异构体之后，我们提供了对其核结构的详细了解，并提出了一种非破坏性光学检测方法。
The isotope229Th is the only nucleus known to possess an excited state229mTh in the energy range of a few electronvolts—a transition energy typical for electrons in the valence shell of atoms, but about four orders of magnitude lower than typical nuclear excitation energies. Of the many applications that have been proposed for this nuclear system, which is accessible by optical methods, the most promising is a highly precise nuclear clock that outperforms existing atomic timekeepers. Here we present the laser spectroscopic investigation of the hyperfine structure of the doubly charged229mTh ion and the determination of the fundamental nuclear properties of the isomer, namely, its magnetic dipole and electric quadrupole moments, as well as its nuclear charge radius. Following the recent direct detection of this long-sought isomer, we provide detailed insight into its nuclear structure and present a method for its non-destructive optical detection.