We present an updated EDM effective electric field of $E_{\text{eff}} = 75.2\left[\frac{\rm GV}{\rm cm}\right]$ and the electron-nucleon scalar-pseudoscalar interaction constant $W_S=107.8$ [kHz] for the ${^3Δ}_1$ science state of ThO. The criticisms made in reference [J. Chem. Phys. 142, 024301 (2015)] are addressed and largely found to be unsubstantiated within the framework of our approach.
Reply to the Comment on "Theoretical study of thorium monoxide for the electron electric dipole moment search: Electronic properties of $H^3Δ_1$ in ThO"
我们回答评论[M]。Denis，T. Fleig，arXiv：1605.03091v1（2016）]在论文[L.V.Skripnikov and A.V.Titov，J.Chem.Phys.142，024301（2015）]上。
Optical cycling on thorium monoxide (ThO) for an improved test of fundamental symmetries
Facility for Rare Isotope Beams, Michigan State University（密歇根州立大学稀有同位束设施）；Department of Physics and Astronomy, Michigan State University（密歇根州立大学物理与天文学系）
Properties of the ground $^3$F$_2$ state and the excited $^3$P$_0$ state of atomic thorium in cold collisions with $^3$He
我们测量了钍原子与$^3$ He冷碰撞中基态$^3$ $_2$和激发态$^3$ $_0$的非弹性碰撞截面。我们确定Th（$^3$ F $_2$）在800 mK的比例$γ\approx 500$的动量转移塞曼弛豫截面与$^3$ He的碰撞。对于Th（$^3$ P $_0$），我们研究了电子非弹性过程，发现即使在$10^6$碰撞后也没有猝灭。我们还确定的辐射寿命的Th（$^3$ P $_0$）为$τ> 130$ ms。这种巨大的稳定性的亚稳态开辟了进一步研究的可能性，包括捕获。
The best limit on the electron electric dipole moment (eEDM) comes from the ACME II experiment [Nature \textbf{562} (2018), 355-360] which probes physics beyond the Standard Model at energy scales well above 1 TeV. ACME II measured the eEDM by monitoring electron spin precession in a cold beam of the metastable H$^3Δ_1$ state of thorium monoxide (ThO) molecules, with an observation time $τ\approx 1$ ms for each molecule. We report here a new measurement of the lifetime of the ThO (H$^3Δ_1$) state, $τ_H = 4.2\pm 0.5$ ms. Using an apparatus within which $τ\approx τ_H$ will enable a substantial r…
We examine the effect of a parasitic rf magnetic field, attributed to ion trapping, on the highly anticipated nuclear clock based on $^{229}$Th$^{3+}$ [C. J. Campbell et al., Phys. Rev. Lett. 108, 120802 (2012)]. The rf magnetic field induces an ac Zeeman shift to the clock frequency. As we demonstrate, this shift threatens to be the dominant systematic frequency shift for the clock, exceeding other systematic frequency shifts and the projected systematic uncertainty of the clock by orders of magnitude. We propose practical means to suppress or eliminate this shift.
Defect assignment of the clock site in $^{229}\text{Th:CaF}_2$
Los Alamos National Laboratory（洛斯阿拉莫斯国家实验室）；University of Manchester（曼彻斯特大学）；University of California, Los Angeles（加州大学洛杉矶分校）；University of Nevada, Reno（内华达大学里诺分校）；Challenge Institute for Quantum Computation（量子计算挑战研究所）；Center for Quantum Science and Engineering（量子科学与工程中心）
在当前最佳极限|d_e| < 1.05 e-27 e cm的几个数量级内测量电子的非零电偶极矩（EDM）将是物理学超出标准模型的指示。ACME合作正在寻找一种电子EDM，通过使用缓慢的低温束在一氧化钍（ThO）的亚稳态H状态下进行电子自旋进动的精确测量。我们讨论了实验的现状。基于在2天的时间内从14小时的运行时间获得的数据集，我们已经实现了1-sigma统计不确定性为1 e-28 e cm/T^（1/2），其中T是以天为单位的运行时间。
