Kjeld Adrianus Antonius Gerardus Beeks

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Building on recent advances of the embedded cluster approach combined with multiconfigurational theory, this work investigates the electronic states in thorium-doped CaF2 crystals. Th:CaF2 is established as a promising material for solid-state nuclear cloc ...

Optical atomic clocks(1,2) use electronic energy levels to precisely keep track of time. A clock based on nuclear energy levels promises a next-generation platform for precision metrology and fundamental physics studies. Thorium-229 nuclei exhibit a unique ...

We have grown Th-232:CaF (2) and Th-229:CaF (2) single crystals for investigations on the VUV laser-accessible first nuclear excited state of Th-229, with the aim of building a solid-state nuclear clock. To reach high doping concentrations despite the extr ...

The excitation of the ^{181m}Ta isomer in the laser-plasma scenario was claimed to have been observed more than two decades ago. However, the reported experimental findings-and the respective high excitation rate-were later questioned as they could not be ...

A comparative vacuum ultraviolet spectroscopy study conducted at ISOLDE-CERN of the radiative decay of the Th229m nuclear clock isomer embedded in different host materials is reported. The ratio of the number of radiative decay photons and the number of Th ...

Kjeld Adrianus Antonius Gerardus Beeks

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Embedded cluster approach for accurate electronic structure calculations of 229Th:CaF2

Frequency ratio of the 229mTh nuclear isomeric transition and the 87Sr atomic clock

Growth and characterization of thorium-doped calcium fluoride single crystals

Revisiting the Excitation of the Low-Lying ^{181m}Ta Isomer in Optical Laser-Generated Plasma

Radiative decay of the Th 229m nuclear clock isomer in different host materials