183 citations · 433 across the 18 of their papers we have counts for
21 papers
A solid-state nuclear clock based on VUV absorption spectroscopy of Th
Pengfei Wang, Xu-Fei Yin, Hanlin Wang +21
We demonstrate sustained operation of a solid-state thorium-229 nuclear clock using continuous-wave absorption at 148.4 nm. In a crystal, we reso…
Defect Dynamics and Isomer Quenching in Th:CaF Crystals
Ming Guan, Michael Bartokos, Kjeld Beeks +16
Thorium-229 doped calcium fluoride (Th:CaF) is a leading candidate for a solid-state nuclear clock, owing to the unusually low energy of the Th isomer transitio…
Thorium-229 as a Phonomagnetometer
Martin Pimon, Andreas Grüneis, Thorsten Schumm +1
Thorium-229 possesses the only known low-energy nuclear transition suitable for spectroscopy with narrowband VUV lasers. While previous experiments have focused on application as a…
Exploring - and -decay-induced quenching of the Th nuclear-clock isomer in solid-state hosts
Y. Elskens, M. Athanasakis-Kaklamanakis, S. Arasada Pradeep +52
The radiative decay dynamics of an ensemble of Th nuclei embedded in CaF and MgF is investigated. The isomer is populated through decay of Ac…
Laser Mössbauer spectroscopy of ^{229}Th
Takahiro Hiraki, Takahiko Masuda, Sayuri Takatori +23
Mössbauer spectroscopy is widely used in biochemistry, geology, and solid-state physics to obtain structural information on materials. Here, we extend this technique into the optic…
Frequency reproducibility of solid-state Th-229 nuclear clocks
Tian Ooi, Jack F. Doyle, Chuankun Zhang +5
Solid-state Th nuclear clocks are set to provide new opportunities for precision metrology and fundamental physics. Taking advantage of a nuclear transition's inherent low…
X-ray-induced quenching of the Th clock isomer in CaF
Ming Guan, Michael Bartokos, Kjeld Beeks +27
Thorium-229 has the lowest nuclear-excited state (an isomer state) at approximately 8.356 eV, making it excitable with tabletop vacuum-ultraviolet lasers. Despite the recent succes…
Laser-Induced Quenching of the Th-229 Nuclear Clock Isomer in Calcium Fluoride
F. Schaden, T. Riebner, I. Morawetz +11
The 10-minute radiative lifetime of the first excited Th nuclear state in ionic crystals provides narrow spectroscopic linewidths, enabling the realization of a soli…
An Embedding Cluster Approach for Accurate Electronic Structure Calculations of (229)Th:CaF2
Kamil Nalikowski, Valera Veryazov, Kjeld Beeks +2
Building on recent advances of the embedded cluster approach combined with multiconfigurational theory, this work investigates the electronic states in thorium-doped CaF2 crystals.…
A method to detect the VUV photons from cooled Th:CaF crystals
Ming Guan, Michael Bartokos, Kjeld Beeks +13
Thorium-229, with its exceptionally low-energy nuclear excited state, is a key candidate for developing nuclear clocks. Th-doped CaF crystals, benefiting from calcium f…
Temperature sensitivity of a Thorium-229 solid-state nuclear clock
Jacob S. Higgins, Tian Ooi, Jack F. Doyle +5
Quantum state-resolved spectroscopy of the low energy thorium-229 nuclear transition was recently achieved. The five allowed transitions within the electric quadrupole structure we…
Radiative Decay of the Th Nuclear Clock Isomer in Different Host Materials
S. V. Pineda, P. Chhetri, S. Bara +42
A comparative vacuum ultraviolet spectroscopy study conducted at ISOLDE-CERN of the radiative decay of the Th nuclear clock isomer embedded in different host materials is…
Fine-structure constant sensitivity of the Th-229 nuclear clock transition
Kjeld Beeks, Georgy A. Kazakov, Fabian Schaden +12
State-resolved laser spectroscopy at the 10 precision level recently reported in :2406.18719 determined the fractional change in nuclear quadrupole moment between th…
Frequency ratio of the Th nuclear isomeric transition and the Sr atomic clock
Chuankun Zhang, Tian Ooi, Jacob S. Higgins +9
Optical atomic clocks use electronic energy levels to precisely keep track of time. A clock based on nuclear energy levels promises a next-generation platform for precision…
Controlling Th isomeric state population in a VUV transparent crystal
Takahiro Hiraki, Koichi Okai, Michael Bartokos +27
The radioisotope Th-229 is renowned for its extraordinarily low-energy, long-lived nuclear first-excited state. This isomeric state can be excited by VUV lasers and the transition…
Revisiting the excitation of the low-lying Ta isomer in optical laser-generated plasma
Simone Gargiulo, Ivan Madan, Benoit Truc +5
The excitation of the Ta isomer in the laser-plasma scenario was claimed to have been observed more than two decades ago. However, the reported experimental finding…
Optical Transmission Enhancement of Ionic Crystals via Superionic Fluoride Transfer: Growing VUV-Transparent Radioactive Crystals
Kjeld Beeks, Tomas Sikorsky, Fabian Schaden +11
The 8 eV first nuclear excited state in Th is a candidate for implementing an nuclear clock. Doping Th into ionic crystals such as CaF is expected to suppress n…
Growth and characterization of thorium-doped calcium fluoride single crystals
Kjeld Beeks, Tomas Sikorsky, Veronika Rosecker +13
We have grown Th:CaF and Th:CaF single crystals for investigations on the VUV laser-accessible first nuclear excited state of Th. To reach high dopi…
Observation of the radiative decay of the nuclear clock isomer
Sandro Kraemer, Janni Moens, Michail Athanasakis-Kaklamanakis +32
The nucleus of the radioisotope thorium-229 (Th) features an isomer with an exceptionally low excitation energy that enables direct laser manipulation of nuclear states.…
Driven electronic bridge processes via defect states in Th-doped crystals
Brenden S. Nickerson, Martin Pimon, Pavlo V. Bilous +7
The electronic defect states resulting from doping Th in CaF offer a unique opportunity to excite the nuclear isomeric state Th at approximately 8 eV via elect…
Absolute X-ray energy measurement using a high-accuracy angle encoder
Takahiko Masuda, Tsukasa Watanabe, Kjeld Beeks +16
This paper presents an absolute X-ray photon energy measurement method that uses a Bond diffractometer. The proposed system enables the prompt and rapid in-situ measurement of phot…