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

arXiv - PHYS - Nuclear Experiment Pub Date : 2024-08-22 DOI:arxiv-2408.12309

S. V. Pineda, P. Chhetri, S. Bara, Y. Elskens, S. Casci, A. N. Alexandrova, M. Au, M. Athanasakis-Kaklamanakis, 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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不同宿主材料中^{229m}$Th 核钟异构体的辐射衰变

报告了在 ISOLDE-CERN 进行的一项真空紫外光谱对比研究，研究了嵌入不同主材料的 $^{229m}$Th 核钟异构体的辐射衰变。研究测定了单晶 CaF$_2$、MgF$_2$、LiSrAlF$_6$、AlN 和无定形 SiO$_2$ 的辐射衰变光子数与嵌入的 $^{229m}$Th 数之比。对于后两种材料，没有观察到辐射衰变信号，因此报告了比率的上限。在 LiSrAlF$_6$ 和 CaF$_2$ 中测定了辐射衰变波长，与我们以前的测量结果相比，其不确定性降低了 2.5 倍。这个值与最近报告的激光激发的改进值一致。

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arXiv - PHYS - Nuclear Experiment

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