Výsledky vyhledávání - "N S, Oreshkina"

Testing standard-model extensions with isotope shifts in few-electron ions

Autor: V. Debierre, N. S. Oreshkina, I. A. Valuev, Z. Harman, C. H. Keitel

Publikováno v: Physical Review A

When collecting spectroscopic data on at least four isotopes, nonlinearitiesin the King plot are a possible sign of Physics beyond the Standard Model. Inthis work, an improved approach to the search for hypothetical new interactionswith isotope shift

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c6433af2ea7841d4d5a6197c2812ecd4
https://doi.org/10.1103/physreva.106.062801

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Akademický článek

Theory of the two-loop self-energy correction to the g factor in nonperturbative Coulomb fields

Autor: B. Sikora, V. A. Yerokhin, N. S. Oreshkina, H. Cakir, C. H. Keitel, Z. Harman

Publikováno v: Physical Review Research, Vol 2, Iss 1, p 012002 (2020)

Two-loop self-energy corrections to the bound-electron g factor are investigated theoretically to all orders in the nuclear binding strength parameter Zα. The separation of divergences is performed by dimensional regularization, and the contributing

Externí odkaz: https://doaj.org/article/bcc6c1a5fed14fa7aae07c869b9c4d3f

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New Measurement Resolves Key Astrophysical Fe XVII Oscillator Strength Problem

Publikováno v: Physical Review Letters
Physical review letters 129(24), 245001 (2022). doi:10.1103/PhysRevLett.129.245001

Physical review letters 129(24), 245001 (2022). doi:10.1103/PhysRevLett.129.245001
One of the most enduring and intensively studied problems of x-ray astronomy is the disagreement of state-of-the art theory and observations for the intensity rat

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::87a42885beaf65cbd4a977f72e1464bf
https://doi.org/10.15120/gsi-2022-00990

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Direct measurement of the

Autor: A, Schneider, B, Sikora, S, Dickopf, M, Müller, N S, Oreshkina, A, Rischka, I A, Valuev, S, Ulmer, J, Walz, Z, Harman, C H, Keitel, A, Mooser, K, Blaum

Publikováno v: Nature. 606(7916)

Helium-3 has nowadays become one of the most important candidates for studies in fundamental physics

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::03af349e980524ba204e4fdd09583887
https://pubmed.ncbi.nlm.nih.gov/35676477

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g Factor of Boronlike Argon ^{40}Ar^{13+}

Autor: I, Arapoglou, A, Egl, M, Höcker, T, Sailer, B, Tu, A, Weigel, R, Wolf, H, Cakir, V A, Yerokhin, N S, Oreshkina, V A, Agababaev, A V, Volotka, D V, Zinenko, D A, Glazov, Z, Harman, C H, Keitel, S, Sturm, K, Blaum

Publikováno v: Physical review letters. 122(25)

We have measured the ground-state g factor of boronlike argon ^{40}Ar^{13+} with a fractional uncertainty of 1.4×10^{-9} with a single ion in the newly developed Alphatrap double Penning-trap setup. The value of g=0.663 648 455 32(93) obtained here

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::0a800a61c44796479a53fb610ceb1618
https://pubmed.ncbi.nlm.nih.gov/31347869

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Identification of the predicted 5s-4f level crossing optical lines with applications to metrology and searches for the variation of fundamental constants

Autor: A, Windberger, J R, Crespo López-Urrutia, H, Bekker, N S, Oreshkina, J C, Berengut, V, Bock, A, Borschevsky, V A, Dzuba, E, Eliav, Z, Harman, U, Kaldor, S, Kaul, U I, Safronova, V V, Flambaum, C H, Keitel, P O, Schmidt, J, Ullrich, O O, Versolato

Publikováno v: Physical review letters. 114(15)

We measure optical spectra of Nd-like W, Re, Os, Ir, and Pt ions of particular interest for studies of a possibly varying fine-structure constant. Exploiting characteristic energy scalings we identify the strongest lines, confirm the predicted 5s-4f

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::a8e89d0c35ddc34ed75b2dd4df4922b3
https://pubmed.ncbi.nlm.nih.gov/25933300

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