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1. Measurement of the Static Stark Shift of the $7s{{}^{2}S}_{1/2}$ Level in Atomic Cesium

   https://doi.org/10.1103/PhysRevLett.132.233201  

   Quirk, Jonah A; Jacobsen, Aidan; Damitz, Amy; Tanner, Carol E; Elliott, D S (June 2024, Physical Review Letters)

   We report a new precision measurement of the dc Stark shift of the $$6s\hspace{1mm} ^2S_{1/2} \rightarrow 7s\hspace{1mm}^2S_{1/2}$$ transition in atomic cesium-133. Our result is 0.72246 (29) $$\textrm{Hz}(\textrm{V}/\textrm{cm})^{-2}$$. This result differs from a previous measurement of the Stark shift by $$\sim$$0.5\%, or 4.7$$\sigma$$. We use this value to recalculate the magnitude of the reduced dipole matrix elements $$\langle7s ||r||7p_{j}\rangle$$, as well as the vector transition polarizability for the $$6s \rightarrow 7s$$ transition, $$\tilde{\beta} = 27.043 \: (36) \ a_0^3$$. This determination helps resolve a critical discrepancy between two techniques for determining the vector polarizability. 

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2. Absolute frequency measurement of the $2p^2{(}^{3}P)3s{}^{2}P–2p^2{(}^{3}P)3p{}^2{D}^o$ transitions in neutral ${}^{14}\mathrm{N}$

   https://doi.org/10.1103/PhysRevA.108.042815  

   Ahrendsen, K J; Maruko, C; Albert-Aranovich, K R; Berfield-Brewer, Q; Esseln, A; Guo, L; Ishimwe, A E; Kuzniar, Y; McKenna, A E; Villarreal, K_J Soto; et al (October 2023, Physical Review A)

   We report absolute frequency measurements on the three excited-state transitions connecting the 2p2 (3P)3s 2P1/2,3/2 and 2p2 (3P)3p 2D◦ 3/2,5/2 states in neutral 14N using saturated absorption spectroscopy in a glass cell filled with a mixture of nitrogen and argon gas and driven with a radio-frequency electric field. The absolute transition frequencies are found to be 319 288 834(150), 319 085 445(125), and 316 795 808(140) MHz for the 1/2–3/2, 3/2–5/2, and 3/2–3/2 transitions, respectively. This work represents the saturated absorption measurements for these transitions. These results are approximately a factor of 5 improvement over previous results, despite being conservative estimates. We found that the overlapping hyperfine structure prevented fitting individual spectral features, presenting difficulties for possible future tests of quantum electrodynamics in seven-electron systems. A better understanding of the amplitude behavior of a merged hyperfine structure will allow the extrapolation of the center of gravity frequencies for these transitions to sub-MHz precision using our collected data. 

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3. Observation of a $\mu \text{s}$ isomer in ${}_{49}{}^{134}\mathrm{In}_{85}$ : Proton-neutron coupling “southeast” of ${}_{50}{}^{132}\mathrm{Sn}_{82}$

   https://doi.org/10.1103/PhysRevC.100.011302  

   Phong, V. H.; Lorusso, G.; Davinson, T.; Estrade, A.; Hall, O.; Liu, J.; Matsui, K.; Montes, F.; Nishimura, S.; Boso, A.; et al (July 2019, Physical Review C)
4. Experimental constraint on stellar electron-capture rates from the ${}^{88}\mathrm{Sr}(t,{}^3\mathrm{He}+\gamma ){}^{88}\mathrm{Rb}$ reaction at 115 MeV/u

   https://doi.org/10.1103/PhysRevC.100.032801  

   Zamora, J. C.; Zegers, R. G.; Austin, Sam M.; Bazin, D.; Brown, B. A.; Bender, P. C.; Crawford, H. L.; Engel, J.; Falduto, A.; Gade, A.; et al (September 2019, Physical Review C)
5. Direct measurement of the $7s{}^2{S}_{1/2}\to 7p{}^2{P}_{3/2}$ transition frequency in ${}^{226}\mathrm{Ra}^{+}$

   https://doi.org/10.1103/PhysRevA.102.042822  

   Holliman, C. A.; Fan, M.; Contractor, A.; Straus, M. W.; Jayich, A. M. (October 2020, Physical Review A)

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