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3. Study of ${\mathrm{\Lambda }}_b^0$ and ${\mathrm{\Xi }}_b^0$ Decays to $\mathrm{\Lambda }{h}^{+}{h}^{\prime -}$ and Evidence for $CP$ Violation in ${\mathrm{\Lambda }}_b^0\to \mathrm{\Lambda }{K}^{+}{K}^{-}$ Decays

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5. Lifetimes of the Metastable $6\mathrm{d}{}^2{\mathrm{D}}_{5/2}$ and $6\mathrm{d}{{}^2\mathrm{D}}_{3/2}$ States of ${\mathrm{Ra}}^{+}$

   https://doi.org/10.1103/5754-4cbv  

   Li, Haoran; Dan, Huaxu; Fan, Mingyu; Kofford, Spencer; Kwapisz, Robert; Ready, Roy A; Sawhney, Akshay; Brzeczek, Merrell; Holliman, Craig; Jayich, Andrew M; et al (August 2025, Physical Review Letters)

   We report lifetime measurements of the metastable 6d 2D5=2 and 6d 2D3=2 states of Raþ. The measured lifetimes, τ5 ¼ 303.8ð1.5Þ ms and τ3 ¼ 642ð9Þ ms, are important for optical frequency standards and for benchmarking high-precision relativistic atomic theory. Independent of the reported measurements, the D state lifetimes were calculated using the coupled-cluster single double triple method, in which the coupled- cluster equations for both core and valence triple excitations were solved iteratively. The method was designed for precise prediction of atomic properties, especially for heavy elements, where relativistic and correlation corrections become large, making their treatment more challenging. This Letter presents the first tests of the method for transition properties. Our prediction agrees with experimental values within the uncertainties. The ability to accurately predict the atomic properties of heavy elements is important for many applications, from tests of fundamental symmetries to the development of optical clocks. 

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