CERN Accelerating science

Preprint
Report number	arXiv:2408.12309
Title	Radiative Decay of the $^{229m}$Th Nuclear Clock Isomer in Different Host Materials
Author(s)	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) ; Bernerd, C. (Leuven U. ; CERN) ; Claessens, A. (Leuven U.) ; Chrysalidis, K. (CERN) ; Cocolios, T.E. (Leuven U.) ; Correia, J.G. (Lisbon, IST) ; De Witte, H. (Leuven U.) ; Elwell, R. (UCLA, Los Angeles (main)) ; Ferrer, R. (Leuven U.) ; Heinke, R. (CERN) ; Hudson, E.R. (UCLA, Los Angeles (main)) ; Ivandikov, F. (Leuven U.) ; Kudryavtsev, Yu. (Leuven U.) ; Köster, U. (Laue-Langevin Inst.) ; Kraemer, S. (Leuven U. ; LMU Munich (main)) ; Laatiaoui, M. (Mainz U.) ; Lica, R. (Bucharest, IFIN-HH) ; Merckling, C. (IMEC, Leuven) ; Morawetz, I. (Vienna, Tech. U., Atominst.) ; Morgan, H.W.T. (UCLA, Los Angeles (main)) ; Moritz, D. (LMU Munich (main)) ; Pereira, L.M.C. (Leuven U.) ; Raeder, S. (Darmstadt, GSI) ; Rothe, S. (CERN) ; Schaden, F. (Vienna, Tech. U., Atominst.) ; Scharl, K. (LMU Munich (main)) ; Schumm, T. (Vienna, Tech. U., Atominst.) ; Stegemann, S. (CERN) ; Terhune, J. (UCLA, Los Angeles (main)) ; Thirolf, P.G. (LMU Munich (main)) ; Tunhuma, S.M. (Leuven U.) ; Bergh, P. Van Den (Leuven U.) ; Van Duppen, P. (Leuven U.) ; Vantomme, A. (Leuven U.) ; Wahl, U. (Lisbon, IST) ; Yue, Z. (York U., England)
Imprint	2024-08-22
Number of pages	13
Subject category	nucl-ex ; Nuclear Physics - Experiment
Abstract	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. The ratio of the number of radiative decay photons and the number of $^{229m}$Th embedded are determined for single crystalline CaF$_2$, MgF$_2$, LiSrAlF$_6$, AlN, and amorphous SiO$_2$. 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 LiSrAlF$_6$ and CaF$_2$, 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.
Other source	Inspire
Copyright/License	preprint: (License: CC BY-SA 4.0)