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

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arxiv 2408.12309 v2 pith:DIW7DFMC submitted 2024-08-22 nucl-ex

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. Köster 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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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.

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  1. Theory of internal conversion of the thorium-229 nuclear isomer in solid-state hosts

    physics.atom-ph 2024-11 conditional novelty 7.0 of 10

    The paper derives the internal conversion rate for the thorium-229 nuclear isomer in crystals and shows that it quenches the isomer in about a millisecond whenever the resonance is energetically allowed, compared to t...

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