Record link: 
http://hdl.handle.net/20.500.12708/211625
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Title: 
Radiative decay of the ²²⁹ᵐTh nuclear clock isomer in different host materials
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Citation: 
Pineda, S. V., Chhetri, P., Bara, S., Elskens, Y., Casci, S., Alexandrova, A. N., Au, M., Athanasakis-Kaklamanakis, M., Bartokos, M., Beeks, K., Bernerd, C., Claessens, A., Chrysalidis, K., Cocolios, T. E., Correia, J. G., De Witte, H., Elwell, R., Ferrer, R., Heinke, R., … Yue, Z. (2025). Radiative decay of the 229mTh nuclear clock isomer in different host materials. Physical Review Research (PRResearch), 7(1), Article 013052. https://doi.org/10.1103/PhysRevResearch.7.013052
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Publisher DOI: 
10.1103/PhysRevResearch.7.013052
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Publication Type: 
Article - Original Research Article
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Language: 
English
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Authors: 
Pineda, S. V. 
Chhetri, P. 
Bara, S. 
Elskens, Y. 
Casci, S. 
Alexandrova, A. N. 
Au, M. 
Athanasakis-Kaklamanakis, M. 
Bartokos, Michael 
Beeks, K. 
Bernerd, Cyril 
Claessens, A. 
Chrysalidis, K. 
Cocolios, T. E. 
Correia, J. G. 
De Witte, H. 
Elwell, R. 
Ferrer, R. 
Heinke, R. 
Hudson, E. R. 
Ivandikov, F. 
Kudryavtsev, Yu. 
Köster, U. 
Kraemer, S. 
Laatiaoui, M. 
Lica, R. 
Merckling, C. 
Morawetz, Ira 
Morgan, H. W. T. 
Moritz, D. 
Pereira, L. M. C. 
Raeder, S. 
Rothe, S. 
Schaden, Fabian 
Scharl, K. 
Schumm, Thorsten 
Stegemann, S. 
Terhune, J. 
Thirolf, P. G. 
Tunhuma, S. M. 
Van Den Bergh, P. 
Van Duppen, P. 
Vantomme, A. 
Wahl, U. 
Yue, Z. 
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Organisational Unit: 
E141-07 - Forschungsbereich Quantum Metrology 
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Journal: 
Physical Review Research (PRResearch) 
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Date (published): 
15-Jan-2025
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Number of Pages: 
12
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Publisher: 
American Physical Society
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Peer reviewed: 
Yes
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Keywords: 
Thorium Nuclear Clock
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Abstract: 
A comparative vacuum ultraviolet spectroscopy study conducted at ISOLDE-CERN of the radiative decay of the ²²⁹⁢ᵐTh nuclear clock isomer embedded in different host materials is reported. The ratio of the number of radiative decay photons and the number of ²²⁹⁢ᵐTh embedded are determined for single crystalline CaF₂, MgF₂, LiSrAlF₆, AlN, and amorphous SiO₂. For the latter two materials, no radiative decay signal was observed and an upper limit of the ratio is reported. The radiative decay wavelength was determined in LiSrAlF₆ and CaF₂, reducing its uncertainty by a factor of 2.5 relative to our previous measurement. This value is in agreement with the recently reported improved values from laser excitation.
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Project title: 
Thorium nuclear clocks for fundamental tests of physics: 856415 (European Commission) 
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Research Areas: 
Quantum Metrology and Precision Measurements: 100%
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Science Branch: 
1030 - Physik, Astronomie: 100%
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