$^{225}$ Ra原子电偶极矩的首次测量
First Measurement of the Atomic Electric Dipole Moment of $^{225}$Ra
摘要：
放射性镭-225（$^{225}$ Ra）原子是寻找永久电偶极矩（EDM）的一个有利例子。由于其强大的核八极形变和大原子质量，$^{225}$ Ra对违反时间反演对称性和宇称的核介质中的相互作用特别敏感。我们开发了一种冷原子技术来研究光偶极阱中$^{225}$ Ra原子的自旋进动，并通过完成其原子EDM的首次测量来证明该方法的原理，达到了$|$ $d$（$^{225}$ Ra）$|$ $<$ $5.0\!\times\!10^{-22}$ $e \cdot$ cm的上限（95 $\%$置信度）。
英文摘要：
The radioactive radium-225 ($^{225}$Ra) atom is a favorable case to search for a permanent electric dipole moment (EDM). Due to its strong nuclear octupole deformation and large atomic mass, $^{225}$Ra is particularly sensitive to interactions in the nuclear medium that violate both time-reversal symmetry and parity. We have developed a cold-atom technique to study the spin precession of $^{225}$Ra atoms held in an optical dipole trap, and demonstrated the principle of this method by completing the first measurement of its atomic EDM, reaching an upper limit of $|$$d$($^{225}$Ra)$|$ $<$ $5.0\!\times\!10^{-22}$ $e \cdot$cm (95$\%$ confidence).
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