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- W4387446711 abstract "Thorium-229 ( <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>229</sup> Th) is a laser-excitable nucleus owing to its extremely low first excitation energy in the order of electron volts. Nuclear clocks, which utilize the resonance frequency of this unique nuclear isomer transition of <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>229</sup> Th, are expected to demonstrate relatively higher accuracy compared to conventional atomic clocks. Particularly, solid-state nuclear clocks using <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>229</sup> Th-doped crystals are expected to have a variety of applications for both fundamental physics and practical use in society as compact and precision clocks. However, laser excitation of <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>229</sup> Th remains challenging due to the energy and lifetime uncertainty of the <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>229</sup> Th isomer state. To address this challenge, we developed an original excitation method that does not attempt direct excitation to the first isometric state but instead excites to the second excitation state with transition properties and generates the isomer state known through a de-excitation process from the second excitation state. We are currently applying this method to <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>229</sup> Th-doped crystals to search for de-excitation vacuum-ultraviolet (VUV) light from the first isomeric state. This paper presents the current status of our search." @default.
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- W4387446711 date "2023-05-15" @default.
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- W4387446711 title "Vacuum Tltraviolet Search from Thorium-229 Isomer in Crystal Toward Solid-State Nuclear Clock" @default.
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- W4387446711 doi "https://doi.org/10.1109/eftf/ifcs57587.2023.10272086" @default.
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