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  Resonant X-ray excitation of the nuclear clock isomer 45Sc

Shvyd’ko, Y., Röhlsberger, R., Kocharovskaya, O., Evers, J., Geloni, G. A., Liu, P., et al. (2023). Resonant X-ray excitation of the nuclear clock isomer 45Sc. Nature, 622, 471-475. doi:10.1038/s41586-023-06491-w.

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https://www.nature.com/articles/d41586-023-02791-3 (Supplementary material)
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Nature research briefing: Scandium-45 nuclear-clock candidate driven by X-ray lasers
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pro-physik.de: Scandium tickt präziser als Cäsium
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European XFEL: Milestone for novel atomic clock
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 Creators:
Shvyd’ko, Yuri, Author
Röhlsberger, Ralf, Author
Kocharovskaya, Olga, Author
Evers, Jörg1, Author           
Geloni, Gianluca Aldo, Author
Liu, Peifan, Author
Shu, Deming, Author
Miceli, Antonino, Author
Stone, Brandon, Author
Hippler, Willi, Author
Marx-Glowna, Berit, Author
Uschmann, Ingo, Author
Loetzsch, Robert, Author
Leupold, Olaf, Author
Wille, Hans-Christian, Author
Sergeev, Ilya, Author
Gerharz, Miriam1, Author           
Zhang, Xiwen, Author
Grech, Christian, Author
Guetg, Marc, Author
Kocharyan, Vitali, AuthorKujala, Naresh, AuthorLiu, Shan, AuthorQin, Weilun, AuthorZozulya, Alexey, AuthorHallmann, Jörg, AuthorBoesenberg, Ulrike, AuthorJo, Wonhyuk, AuthorMöller, Johannes, AuthorRodriguez-Fernandez, Angel, AuthorYoussef, Mohamed, AuthorMadsen, Anders , AuthorKolodziej, Tomasz, Author more..
Affiliations:
1Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society, ou_904546              

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Free keywords: Experimental nuclear physics, Free-electron lasers, Single photons, quantum effects, X-rays
 MPINP: Research group J. Evers – Division C. H. Keitel
 Abstract: Resonant oscillators with stable frequencies and large quality factors help us to keep track of time with high precision. Examples range from quartz crystal oscillators in wristwatches to atomic oscillators in atomic clocks, which are, at present, our most precise time measurement devices. The search for more stable and convenient reference oscillators is continuing. Nuclear oscillators are better than atomic oscillators because of their naturally higher quality factors and higher resilience against external perturbations. One of the most promising cases is an ultra-narrow nuclear resonance transition in 45Sc between the ground state and the 12.4-keV isomeric state with a long lifetime of 0.47 s. The scientific potential of 45Sc was realized long ago, but applications require 45Sc resonant excitation, which in turn requires accelerator-driven, high-brightness X-ray sources that have become available only recently. Here we report on resonant X-ray excitation of the 45Sc isomeric state by irradiation of Sc-metal foil with 4-keV photon pulses from a state-of-the-art X-ray free-electron laser and subsequent detection of nuclear decay products. Simultaneously, the transition energy was determined as 12,389.59±0.15(stat)+0.12(syst)eV with an uncertainty that is two orders of magnitude smaller than the previously known values. These advancements enable the application of this isomer in extreme metrology, nuclear clock technology, ultra-high-precision spectroscopy and similar applications.

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 Dates: 2023-09-27
 Publication Status: Published online
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1038/s41586-023-06491-w
 Degree: -

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Title: Nature
  Abbreviation : Nature
Source Genre: Journal
 Creator(s):
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 622 Sequence Number: - Start / End Page: 471 - 475 Identifier: ISSN: 0028-0836
CoNE: https://pure.mpg.de/cone/journals/resource/954925427238