Zobrazeno 1 - 10
of 250
pro vyhledávání: '"Porsev, S G"'
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:
Klüsener, V., Pucher, S., Yankelev, D., Trautmann, J., Spriestersbach, F., Filin, D., Porsev, S. G., Safronova, M. S., Bloch, I., Blatt, S.
Publikováno v:
Physical Review Letters 132, 253201 (2024)
We report on the coherent excitation of the ultranarrow $^{1}\mathrm{S}_0$-$^{3}\mathrm{P}_2$ magnetic quadrupole transition in $^{88}\mathrm{Sr}$. By confining atoms in a state insensitive optical lattice, we achieve excitation fractions of 97(1)% a
Externí odkaz:
http://arxiv.org/abs/2401.03934
We address the problem of lattice light shifts in the Sr clock caused by multipolar M1 and E2 atom-field interactions. We presented a simple but accurate formula for the magnetic-dipole polarizability that takes into account both the positive and neg
Externí odkaz:
http://arxiv.org/abs/2306.10173
We carried out calculations of the energies and magnetic dipole hyperfine structure constants of the low-lying states of 233U^+ and 233U using two different approaches. With six valence electrons and a very heavy core, uranium represents a major chal
Externí odkaz:
http://arxiv.org/abs/2204.13214
Autor:
Norrgard, E. B., Barker, D. S., Eckel, S. P., Porsev, S. G., Cheung, C., Kozlov, M. G., Tupitsyn, I. I., Safronova, M. S.
Here we report measured and calculated values of decay rates of the 3d$^4$($^5$D)4s4p($^3$P$^{\rm{o}}$)\ y$^7$P$^{\rm{o}}_{2,3,4}$ states of Cr I. The decay rates are measured using time-correlated single photon counting with roughly 1% total uncerta
Externí odkaz:
http://arxiv.org/abs/2111.12049
Determination of nuclear moments for many nuclei relies on the computation of hyperfine constants, with theoretical uncertainties directly affecting the resulting uncertainties of the nuclear moments. In this work we improve the precision of such met
Externí odkaz:
http://arxiv.org/abs/2107.14723
The nuclear transition between the ground and the low-energy isomeric state in the ^{229}Th nucleus is of interest due to its high sensitivity to a hypothetical temporal variation of the fundamental constants and a possibility to build a very precise
Externí odkaz:
http://arxiv.org/abs/2105.00512
High precision atomic data is indispensable for experiments involving studies of fundamental interactions, astrophysics, atomic clocks, plasma science, and others. We develop new parallel atomic structure codes and explore the difficulties of load-ba
Externí odkaz:
http://arxiv.org/abs/2103.04473
Autor:
Porsev, S. G., Safronova, M. S.
Publikováno v:
Phys. Rev. A 103, 042815 (2021)
We carried out calculations of the energies, hyperfine structure constants and electric-dipole transiton amplitudes for the low-lying states of Ba+ in the framework of the relativistic linearized coupled-cluster single double (LCCSD) and coupled-clus
Externí odkaz:
http://arxiv.org/abs/2103.02776
Autor:
Porsev, S. G., Safronova, U. I., Safronova, M. S., Schmidt, P. O., Bondarev, A. I., Kozlov, M. G., Tupitsyn, I. I.
Publikováno v:
Phys. Rev. A 102, 012802 (2020)
Recent experimental progress in cooling, trapping, and quantum logic spectroscopy of highly-charged ions (HCIs) made HCIs accessible for high resolution spectroscopy and precision fundamental studies. Based on these achievements, we explore a possibi
Externí odkaz:
http://arxiv.org/abs/2004.05978