<div class="csl-bib-body">
<div class="csl-entry">Tiedau, J., Okhapkin, M. V., Zhang, K., Thielking, J., Zitzer, G., Peik, E., Schaden, F., Pronebner, T. T., Morawetz, I., Toscani De Col, L., Schneider, F., Leitner, A., Pressler, M., Kazakov, G., Beeks, K. A. A. G., Sikorsky, T., & Schumm, T. (2024). Laser Excitation of the Th-229 Nucleus. <i>Physical Review Letters</i>, <i>132</i>(18), Article 182501. https://doi.org/10.1103/PhysRevLett.132.182501</div>
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dc.identifier.issn
0031-9007
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/205156
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dc.description.abstract
The 8.4 eV nuclear isomer state in Th-229 is resonantly excited in Th-doped CaF₂ crystals using a tabletop tunable laser system. A resonance fluorescence signal is observed in two crystals with different Th-229 dopant concentrations, while it is absent in a control experiment using Th-232. The nuclear resonance for the Th⁴⁺ ions in Th:CaF₂ is measured at the wavelength 148.3821(5) nm, frequency 2020.409(7) THz, and the fluorescence lifetime in the crystal is 630(15) s, corresponding to an isomer half-life of 1740(50) s for a nucleus isolated in vacuum. These results pave the way toward Th-229 nuclear laser spectroscopy and realizing optical nuclear clocks.
