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pCI: A parallel configuration interaction software package for high-precision atomic structure calculations

https://doi.org/10.1016/j.cpc.2024.109463

Cheung, Charles; Kozlov, Mikhail G; Porsev, Sergey G; Safronova, Marianna S; Tupitsyn, Ilya I; Bondarev, Andrey I (March 2025, Computer Physics Communications)

Free, publicly-accessible full text available March 1, 2026
Natural-linewidth measurements of the $3 C$ and $3 D$ soft-x-ray transitions in Ni xix

https://doi.org/10.1103/PhysRevA.109.063108

Shah, Chintan; Kühn, Steffen; Bernitt, Sonja; Steinbrügge, René; Togawa, Moto; Berger, Lukas; Buck, Jens; Hoesch, Moritz; Seltmann, Jörn; Kozlov, Mikhail G; et al (June 2024, Physical Review A)

We used the monochromatic soft-x-ray beamline P04 at the synchrotron-radiation facility PETRA III to resonantly excite the strongest $2 p − 3 d$ transitions in neonlike $Ni$ ions, ${[2 p^{6}]}_{J = 0} \to {[{(2 p^{5})}_{1 / 2} 3 d_{3 / 2}]}_{J = 1}$ and ${[2 p^{6}]}_{J = 0} \to {[{(2 p^{5})}_{3 / 2} 3 d_{5 / 2}]}_{J = 1}$ , respectively dubbed $3 C$ and $3 D$ , achieving a resolving power of 15 000 and signal-to-background ratio of 30. We obtain their natural linewidths, with an accuracy of better than 10%, as well as the oscillator-strength ratio $f (3 C) / f (3 D) = 2.51 (11)$ from analysis of the resonant fluorescence spectra. These results agree with those of previous experiments, earlier predictions, and our own advanced calculations. Published by the American Physical Society2024
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New Measurement Resolves Key Astrophysical Fe XVII Oscillator Strength Problem

https://doi.org/10.1103/PhysRevLett.129.245001

Kühn, Steffen; Cheung, Charles; Oreshkina, Natalia S.; Steinbrügge, René; Togawa, Moto; Bernitt, Sonja; Berger, Lukas; Buck, Jens; Hoesch, Moritz; Seltmann, Jörn; et al (December 2022, Physical Review Letters)

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Constraints on Exotic Spin-Dependent Interactions Between Matter and Antimatter from Antiprotonic Helium Spectroscopy

https://doi.org/10.1103/PhysRevLett.120.183002

Ficek, Filip; Fadeev, Pavel; Flambaum, Victor V.; Jackson Kimball, Derek F.; Kozlov, Mikhail G.; Stadnik, Yevgeny V.; Budker, Dmitry (May 2018, Physical Review Letters)

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