Zobrazeno 1 - 10
of 7 539
pro vyhledávání: '"Safronova, A A"'
Autor:
Cheung, Charles, Kozlov, Mikhail G., Porsev, Sergey G., Safronova, Marianna S., Tupitsyn, Ilya I., Bondarev, Andrey I.
We introduce the pCI software package for high-precision atomic structure calculations. The standard method of calculation is based on the configuration interaction (CI) method to describe valence correlations, but can be extended to attain better ac
Externí odkaz:
http://arxiv.org/abs/2410.06680
Autor:
Bothwell, Tobias, Hunt, Benjamin D., Siegel, Jacob L., Hassan, Youssef S., Grogan, Tanner, Kobayashi, Takumi, Gibble, Kurt, Porsev, Sergey G., Safronova, Marianna S., Brown, Roger C., Beloy, Kyle, Ludlow, Andrew D.
In state-of-the-art optical lattice clocks, beyond-electric-dipole polarizability terms lead to a break-down of magic wavelength trapping. In this Letter, we report a novel approach to evaluate lattice light shifts, specifically addressing recent dis
Externí odkaz:
http://arxiv.org/abs/2409.10782
While it is possible to estimate the dark matter density at the Sun distance from the galactic center, this does not give information on actual dark matter density in the Solar system. There can be considerable local enhancement of dark matter densit
Externí odkaz:
http://arxiv.org/abs/2408.10324
Modern applications of atomic physics, including the determination of frequency standards, and the analysis of astrophysical spectra, require prediction of atomic properties with exquisite accuracy. For complex atomic systems, high-precision calculat
Externí odkaz:
http://arxiv.org/abs/2408.00477
Autor:
Porsev, S. G., Cheung, C., Safronova, M. S., Bekker, H., Rehbehn, N. -H., Lopez-Urrutia, J. R. Crespo, Brewer, S. M.
We propose In-like Pr10+ as a candidate for the development of a high-accuracy optical clock with high sensitivity to a time variation of the fine-structure constant, (\dot alpha}/alpha, as well as favorable experimental systematics. We calculate its
Externí odkaz:
http://arxiv.org/abs/2407.17610
Autor:
Beeks, Kjeld, Kazakov, Georgy A., Schaden, Fabian, Morawetz, Ira, de Col, Luca Toscani, Riebner, Thomas, Bartokos, Michael, Sikorsky, Tomas, Schumm, Thorsten, Zhang, Chuankun, Ooi, Tian, Higgins, Jacob S., Doyle, Jack F., Ye, Jun, Safronova, Marianna S.
State-resolved laser spectroscopy at the 10$^{-12}$ precision level recently reported in $arXiv$:2406.18719 determined the fractional change in nuclear quadrupole moment between the ground and isomeric state of $^{229}\rm{Th}$, $\Delta Q_0/Q_0$=1.791
Externí odkaz:
http://arxiv.org/abs/2407.17300
Autor:
Shah, Chintan, Kühn, Steffen, Bernitt, Sonja, Steinbrügge, René, Togawa, Moto, Berger, Lukas, Buck, Jens, Hoesch, Moritz, Seltmann, Jörn, Kozlov, Mikhail G., Porsev, Sergey G., Gu, Ming Feng, Porter, F. Scott, Pfeifer, Thomas, Leutenegger, Maurice A., Cheung, Charles, Safronova, Marianna S., López-Urrutia, José R. Crespo
Publikováno v:
Physical Review A 109, 063108 (2024)
We used the monochromatic soft-x-ray beamline P04 at the synchrotron-radiation facility PETRA III to resonantly excite the strongest $2p-3d$ transitions in neon-like Ni XIX ions, $[2p^6]_{J=0} \rightarrow [(2p^5)_{1/2}\,3d_{3/2}]_{J=1}$ and $[2p^6]_{
Externí odkaz:
http://arxiv.org/abs/2404.14589
Publikováno v:
Phys. Rev. Lett. 133, 023401 (2024)
We report an optical lattice clock with a total systematic uncertainty of $8.1 \times 10^{-19}$ in fractional frequency units, representing the lowest uncertainty of any clock to date. The clock relies on interrogating the ultra-narrow ${}^1S_0 \righ
Externí odkaz:
http://arxiv.org/abs/2403.10664
Autor:
Arakawa, Jason, Zaheer, Muhammad H., Eby, Joshua, Takhistov, Volodymyr, Safronova, Marianna S.
Publikováno v:
J. High Energ. Phys. 2024, 222 (2024)
Ultralight dark matter (ULDM) particles of mass $m_\phi \lesssim 1~{\rm eV}$ can form boson stars in DM halos. Collapse of boson stars leads to explosive bosenova emission of copious relativistic ULDM particles. In this work, we analyze sensitivity o
Externí odkaz:
http://arxiv.org/abs/2402.06736
Autor:
Shah, Chintan, Togawa, Moto, Botz, Marc, Danisch, Jonas, Goes, Joschka J., Bernitt, Sonja, Maxton, Marleen, Köbnick, Kai, Buck, Jen, Seltmann, Jörn, Hoesch, Moritz, Gu, Ming Feng, Porter, F. Scott, Pfeifer, Thomas, Leutenegger, Maurice A., Cheung, Charles, Safronova, Marianna S., López-Urrutia, José R. Crespo
Publikováno v:
The Astrophysical Journal, 969, 52 (2024)
We improve by a factor of 4-20 the energy accuracy of the strongest soft X-ray transitions of Fe XVII ions by resonantly exciting them in an electron beam ion trap with a monochromatic beam at the P04 beamline of the PETRA III synchrotron facility. B
Externí odkaz:
http://arxiv.org/abs/2401.08395