Radiative Decay of the $^{229m}$Th Nuclear Clock Isomer in Different Host Materials

A. Claessens; A.N. Alexandrova; A. Vantomme; C. Bernerd; C. Merckling; D. Moritz; E.R. Hudson; F. Ivandikov; F. Schaden; H. de Witte

arxiv: 2408.12309 · v2 · pith:DIW7DFMCnew · submitted 2024-08-22 · ⚛️ nucl-ex

Radiative Decay of the ^(229m)Th Nuclear Clock Isomer in Different Host Materials

S.V. Pineda , P. Chhetri , S. Bara , Y. Elskens , S. Casci , A.N. Alexandrova , M. Au , M. Athanasakis-Kaklamanakis

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M. Bartokos K. Beeks C. Bernerd A. Claessens K. Chrysalidis T.E. Cocolios J.G. Correia H. De Witte R. Elwell R. Ferrer R. Heinke E.R. Hudson F. Ivandikov Yu. Kudryavtsev U. K\"oster S. Kraemer M. Laatiaoui R. Lica C. Merckling I. Morawetz H.W.T. Morgan D. Moritz L.M.C. Pereira S. Raeder S. Rothe F. Schaden K. Scharl T. Schumm S. Stegemann J. Terhune P.G. Thirolf S.M. Tunhuma P. Van Den Bergh P. Van Duppen A. Vantomme U. Wahl Z. Yue

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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.

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Radiative Decay of the ^(229m)Th Nuclear Clock Isomer in Different Host Materials

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