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Radiative Decay of the $^{229m}$Th Nuclear Clock Isomer in Different Host Materials
/ Pineda, S.V. (Leuven U.) ; Chhetri, P. (Leuven U. ; Mainz U.) ; Bara, S. (Leuven U.) ; Elskens, Y. (Leuven U.) ; Casci, S. (Leuven U.) ; Alexandrova, A.N. (UCLA, Los Angeles (main)) ; Au, M. (CERN) ; Athanasakis-Kaklamanakis, M. (Leuven U. ; CERN ; Imperial Coll., London) ; Bartokos, M. (Vienna, Tech. U., Atominst.) ; Beeks, K. (Ecole Polytechnique, Lausanne) et al.
A comparative vacuum ultraviolet spectroscopy study conducted at ISOLDE-CERN of the radiative decay of the $^{229m}$Th nuclear clock isomer embedded in different host materials is reported. [...]
arXiv:2408.12309.
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A setup for vacuum-ultraviolet spectroscopy of the $^{229}$Th low-energy isomer
/ Kraemer, Sandro (KU Leuven ; LMU, Garching) ; Chhetri, Premaditya (KU Leuven) ; Bara, Silvia (KU Leuven) ; Claessens, Arno (KU Leuven) ; De Witte, Hilde (KU Leuven) ; Elskens, Yens (KU Leuven) ; Ferrer, Rafael (KU Leuven) ; Kudryavtsev, Yuri (KU Leuven) ; Sels, Simon (KU Leuven) ; Van Den Bergh, Paul (KU Leuven) et al.
The ground-state transition of the low-energy isomer in $^{229}$Th has been proposed as the basis for the development of a novel optical clock as a tool for fundamental-physics studies. Vacuum-ultraviolet studies of the 𝛽-decay of 229Ac recently enabled to measure the de-excitation energy of the isomer with a sevenfold improvement in precision compared to previous results by directly observing photons from the isomer’s radiative decay. [...]
2023 - 3 p.
- Published in : Nucl. Instrum. Methods Phys. Res., B 542 (2023) 1-3
In : 19th International Conference on Electromagnetic Isotope Separators and Related Topics (EMIS 2022), Daejeon, Korea, 3 - 7 Oct 2022
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Observation of the radiative decay of the ${}^{229}\mathrm{Th}$ nuclear clock isomer
/ Kraemer, Sandro (Leuven U. ; LMU Munich (main)) ; Moens, Janni (Leuven U.) ; Athanasakis-Kaklamanakis, Michail (Leuven U. ; CERN) ; Bara, Silvia (Leuven U.) ; Beeks, Kjeld (Vienna, Tech. U., Atominst.) ; Chhetri, Premaditya (Leuven U.) ; Chrysalidis, Katerina (CERN) ; Claessens, Arno (Leuven U.) ; Cocolios, Thomas E. (Leuven U.) ; Correia, João G.M. (Lisbon U.) et al.
The nucleus of the radioisotope thorium-229 (${}^{229}$Th) features an isomer with an exceptionally low excitation energy that enables direct laser manipulation of nuclear states. For this reason, it is a leading candidate for use in next-generation optical clocks. [...]
arXiv:2209.10276.-
2023-05-24 - 15 p.
- Published in : Nature 617 (2023) 706–710
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Production and study of neutron rich heavy nuclei, GALS setup
/ Zemlyanoy, S (Dubna, JINR) ; Avvakumov, K (Dubna, JINR) ; Myshinsky, G (Dubna, JINR) ; Zhemenik, V (Dubna, JINR) ; Kudryavtsev, Yu (Leuven U.) ; Fedosseev, V (CERN) ; Bark, R (iThemba LABS) ; Janas, Z (Warsaw U.)
A new setup for production and investigation of exotic heavy neutron rich nuclei located in the "north-east" region of nuclear map is under construction at Flerov Laboratory for Nuclear Reactions (FLNR) of JINR, Dubna. The setup will use the available U-400M cyclotron beams for low energy multi-nucleon transfer reactions. [...]
2020 - 6 p.
- Published in : J. Phys. : Conf. Ser. 1555 (2020) 012021
Fulltext: PDF;
In : 23rd International School on Nuclear Physics, Neutron Physics and Applications, Varna, Bulgaria, 22 - 28 Sep 2019, pp.012021
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Design and commissioning of an ion guide system for In-Gas Laser Ionization and Spectroscopy experiments
/ Sels, S (CERN ; Leuven U.) ; Ferrer, R (Leuven U.) ; Dockx, K (Leuven U.) ; Granados Buitrago, C (Leuven U. ; CERN) ; Huyse, M (Leuven U.) ; Kudryavtsev, Yu (Leuven U.) ; Kraemer, S (Leuven U.) ; Raeder, S (Leuven U.) ; Van Den Bergh, P (Leuven U.) ; Van Duppen, P (Leuven U.) et al.
Radio-frequency (RF) ion guides, also known as Linear Paul Traps, are powerful devices to efficiently transport ion beams from high to low pressure regions while keeping good ion optical properties. A set of ion guides comprising three different RF quadrupole (RFQ) structures has been designed using ion-trajectory simulations to improve the performance of the In-Gas Laser Ionizations and Spectroscopy (IGLIS) technique currently under development at KU Leuven. [...]
2020 - 6 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 463 (2020) 148-153
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A new control system for high-precision In-Gas Laser Ionization and Spectroscopy experiments at KU Leuven
/ Dockx, K (Leuven U.) ; Cocolios, T E (Leuven U.) ; Ferrer, R (Leuven U.) ; Granados, C (CERN) ; Kraemer, S (Leuven U.) ; Kudryavtsev, Yu (Leuven U.) ; Sels, S (CERN) ; Van den Bergh, P (Leuven U.) ; Van Duppen, P (Leuven U.) ; Verlinde, M (Leuven U.) et al.
A new automated control system is developed for the In-Gas Laser Ionization and Spectroscopy (IGLIS) laboratory at KU Leuven. The IGLIS Control System is capable of stabilizing a narrowband single-mode tunable
diode laser with a standard deviation of 1.14 MHz. [...]
2020 - 5 p.
- Published in : Nucl. Instrum. Methods Phys. Res., B 463 (2020) 297-301
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Single-longitudinal-mode pumped pulsed-dye amplifier for high-resolution laser spectroscopy
/ Verlinde, M (Leuven U.) ; Ferrer, R (Leuven U.) ; Claessens, A (Leuven U.) ; Granados, C A (Leuven U. ; CERN) ; Kraemer, S (Leuven U.) ; Kudryavtsev, Yu (Leuven U.) ; Li, D (Unlisted, DE) ; Van den Bergh, P (Leuven U.) ; Van Duppen, P (Leuven U.) ; Verstraelen, E (Leuven U.)
The In-Gas-jet Laser Ionization and Spectroscopy (IGLIS) technique relies on narrow-bandwidth, high-peak-power, short-pulse-length (≈10 ns), and high-repetition-rate laser pulses to probe, precisely and efficiently, the hyperfine structure of medium-heavy and heavy isotopes, embedded in a supersonic jet. The power and repetition rate requirements of the laser system are met by combining ≈100 W, 8 ns pulse width, 10 kHz commercial Nd:YAG pump lasers with a single-mode continuous wave seeded Pulsed Dye Amplifier (PDA). [...]
2020
- Published in : Rev. Sci. Instrum. 91 (2020) 103002
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Production and Study of Neutron Rich Heavy Nuclei, GALS Setup
/ Zemlyanoy, S G (Dubna, JINR) ; Zagrebaev, V I (Dubna, JINR) ; Avvakumov, K A (Dubna, JINR) ; Kazarinov, N Yu (Dubna, JINR) ; Kudryavtsev, Yu (Leuven U.) ; Fedosseev, V (CERN) ; Bark, R (iThemba LABS) ; Janas, Z (Warsaw U.)
To produce and investigate exotic heavy neutron rich nuclei located in the “north-east” region of nuclear map the new setup is under construction at Flerov Laboratory for Nuclear Reactions (FLNR) of JINR, Dubna. In this setup available U-400M cyclotron beams will be used in low energy multi-nucleon transfer reactions. [...]
2020 - 7 p.
- Published in : 10.1142/9789811209451_0071
In : 9th International Symposium on Exotic Nuclei (EXON 2018), Petrozavodsk, Russian Federation, 10 - 15 Sep 2018, pp.492-498
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Further development of GALS setup at JINR
/ Zemlyanoy, Sergey (Dubna, JINR) ; Avvakumov, Konstantin (Dubna, JINR) ; Zuzaan, Batsuren (Dubna, JINR) ; Kudryavtsev, Yury (Leuven U.) ; Fedosseev, Valentine (CERN) ; Bark, Robert (Pretoria, Natl. Res. Inst. Math.) ; Janas, Zenon (Warsaw U.)
The aim of this paper is to report on the present status of the GAs cell based Laser ionization and separation Setup (GALS project) that is under construction at the Flerov Laboratory of Nuclear Reactions (FLNR) of JINR, Dubna. This project is directed on production of neutron-rich isotopes in the region of the magic $N$ = 126 neutron number using multi-nucleon transfer reactions. [...]
2020
- Published in : Hyperfine Interact. 241 (2020) 38
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In-gas laser ionization and spectroscopy of actinium isotopes near the $N=126$ closed shell
/ Granados, C (Leuven U.) ; Creemers, P (Leuven U.) ; Ferrer, R (Leuven U.) ; Gaffney, L P (Leuven U.) ; Gins, W (Leuven U.) ; de Groote, R (Leuven U.) ; Huyse, M (Leuven U.) ; Kudryavtsev, Yu (Leuven U.) ; Martinez, Y (Leuven U.) ; Raeder, S (Leuven U.) et al.
The in-gas laser ionization and spectroscopy (IGLIS) technique was applied on the Ac212–215 isotopes, produced at the Leuven Isotope Separator On-Line (LISOL) facility by using the in-gas-cell and the in-gas-jet methods. The first application under on-line conditions of the in-gas-jet laser spectroscopy method showed a superior performance in terms of selectivity, spectral resolution, and efficiency in comparison with the in-gas-cell method. [...]
2017 - 13 p.
- Published in : Phys. Rev. C 96 (2017) 054331
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