Kjeld Beeks

892 total citations · 2 hit papers
17 papers, 421 citations indexed

About

Kjeld Beeks is a scholar working on Atomic and Molecular Physics, and Optics, Radiation and Electrical and Electronic Engineering. According to data from OpenAlex, Kjeld Beeks has authored 17 papers receiving a total of 421 indexed citations (citations by other indexed papers that have themselves been cited), including 12 papers in Atomic and Molecular Physics, and Optics, 4 papers in Radiation and 2 papers in Electrical and Electronic Engineering. Recurrent topics in Kjeld Beeks's work include Atomic and Subatomic Physics Research (9 papers), Advanced Frequency and Time Standards (9 papers) and Cold Atom Physics and Bose-Einstein Condensates (4 papers). Kjeld Beeks is often cited by papers focused on Atomic and Subatomic Physics Research (9 papers), Advanced Frequency and Time Standards (9 papers) and Cold Atom Physics and Bose-Einstein Condensates (4 papers). Kjeld Beeks collaborates with scholars based in Austria, Germany and Switzerland. Kjeld Beeks's co-authors include Thorsten Schumm, Tomáš Šikorský, Georgy A. Kazakov, M. V. Okhapkin, E. Peik, Johannes Thielking, A. Leitner, Johannes H. Sterba, Jacob S. Higgins and Jun Ye and has published in prestigious journals such as Nature, Physical Review Letters and Nature Communications.

In The Last Decade

Kjeld Beeks

15 papers receiving 412 citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Laser Excitation of the Th-229 Nucleus

2024 74 citations Johannes Tiedau, M. V. Okhapkin et al. Physical Review Letters profile →
Frequency ratio of the 229mTh nuclear isomeric transition and the 87Sr atomic clock

2024 74 citations Chuankun Zhang, Jacob S. Higgins et al. Nature profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Kjeld Beeks Austria	9	340	87	82	38	31	17	421
Johannes Thielking Germany	7	270 0.8×	81 0.9×	78 1.0×	17 0.4×	13 0.4×	7	314
Pavlo Bilous Germany	8	268 0.8×	76 0.9×	57 0.7×	14 0.4×	20 0.6×	16	310
H.-F. Wirth Germany	11	188 0.6×	143 1.6×	102 1.2×	24 0.6×	34 1.1×	18	330
A. Yoshimi Japan	9	248 0.7×	159 1.8×	84 1.0×	35 0.9×	25 0.8×	68	361
M. ROUSSEAU France	12	198 0.6×	402 4.6×	134 1.6×	38 1.0×	54 1.7×	36	463
F. Guzmán Brazil	12	182 0.5×	366 4.2×	62 0.8×	20 0.5×	13 0.4×	36	447
A. J. Simons United Kingdom	9	170 0.5×	259 3.0×	29 0.4×	28 0.7×	42 1.4×	10	302
M. Chen United States	8	221 0.7×	38 0.4×	121 1.5×	35 0.9×	44 1.4×	9	302
E. Mané Canada	13	283 0.8×	308 3.5×	119 1.5×	18 0.5×	17 0.5×	21	434

Countries citing papers authored by Kjeld Beeks

Since Specialization

Citations

This map shows the geographic impact of Kjeld Beeks's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Kjeld Beeks with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Kjeld Beeks more than expected).

Fields of papers citing papers by Kjeld Beeks

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Kjeld Beeks. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Kjeld Beeks. The network helps show where Kjeld Beeks may publish in the future.

Co-authorship network of co-authors of Kjeld Beeks

This figure shows the co-authorship network connecting the top 25 collaborators of Kjeld Beeks. A scholar is included among the top collaborators of Kjeld Beeks based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Kjeld Beeks. Kjeld Beeks is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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17 of 17 papers shown

Higgins, Jacob S., et al.. (2026). Frequency reproducibility of solid-state thorium-229 nuclear clocks. Nature. 650(8100). 72–78.

Beeks, Kjeld, Georgy A. Kazakov, Tomáš Šikorský, et al.. (2025). Fine-structure constant sensitivity of the Th-229 nuclear clock transition. Nature Communications. 16(1). 9147–9147. 2 indexed citations

Beeks, Kjeld, T. Hiraki, Takahiko Masuda, et al.. (2025). A method to detect the VUV photons from cooled 229Th:CaF2 crystals. Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms. 562. 165647–165647. 1 indexed citations

Kazakov, Georgy A., Kjeld Beeks, Tomáš Šikorský, et al.. (2025). Laser-induced quenching of the Th-229 nuclear clock isomer in calcium fluoride. Physical Review Research. 7(2). 8 indexed citations

Veryazov, Valera, et al.. (2025). Embedded cluster approach for accurate electronic structure calculations of Th229:CaF2. Physical review. B.. 111(11). 4 indexed citations

Higgins, Jacob S., Chuankun Zhang, Jun Ye, et al.. (2025). Temperature Sensitivity of a Thorium-229 Solid-State Nuclear Clock. Physical Review Letters. 134(11). 113801–113801. 8 indexed citations

Zhang, Chuankun, Jacob S. Higgins, Lars von der Wense, et al.. (2024). Frequency ratio of the 229mTh nuclear isomeric transition and the 87Sr atomic clock. Nature. 633(8028). 63–70. 74 indexed citations breakdown →

Beeks, Kjeld, Tomáš Šikorský, F. Schneider, et al.. (2024). Optical transmission enhancement of ionic crystals via superionic fluoride transfer: Growing VUV-transparent radioactive crystals. Physical review. B.. 109(9). 8 indexed citations

Tiedau, Johannes, M. V. Okhapkin, Ke Zhang, et al.. (2024). Laser Excitation of the Th-229 Nucleus. Physical Review Letters. 132(18). 182501–182501. 74 indexed citations breakdown →

10.

Madan, Ivan, et al.. (2024). Revisiting the Excitation of the Low-Lying Ta181m Isomer in Optical Laser-Generated Plasma. Physical Review Letters. 133(13). 132501–132501.

11.

Beeks, Kjeld, Tomáš Šikorský, F. Schneider, et al.. (2023). Growth and characterization of thorium-doped calcium fluoride single crystals. Scientific Reports. 13(1). 3897–3897. 27 indexed citations

12.

Beeks, Kjeld. (2022). Growth and characterization of thorium doped calcium fluoride single crystals. Zenodo (CERN European Organization for Nuclear Research). 1 indexed citations

13.

Bilous, Pavlo, Georgy A. Kazakov, Tomáš Šikorský, et al.. (2021). Driven electronic bridge processes via defect states in Th229-doped crystals. Physical review. A. 103(5). 14 indexed citations

14.

Beeks, Kjeld, Tomáš Šikorský, Thorsten Schumm, et al.. (2021). The thorium-229 low-energy isomer and the nuclear clock. Nature Reviews Physics. 3(4). 238–248. 71 indexed citations

15.

Šikorský, Tomáš, Daniel Hengstler, Sebastian Kempf, et al.. (2020). Measurement of the Th229 Isomer Energy with a Magnetic Microcalorimeter. Physical Review Letters. 125(14). 142503–142503. 85 indexed citations

16.

Bilous, Pavlo, Kjeld Beeks, Tomáš Šikorský, et al.. (2020). Nuclear Excitation of the Th229 Isomer via Defect States in Doped Crystals. Physical Review Letters. 125(3). 32501–32501. 39 indexed citations

17.

Masuda, Takahiko, Tsukasa Watanabe, Kjeld Beeks, et al.. (2020). Absolute X-ray energy measurement using a high-accuracy angle encoder. Journal of Synchrotron Radiation. 28(1). 111–119. 5 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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