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the claim

The thorium-229 nuclear transition has a uniquely low energy state.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
5 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that the thorium-229 nuclear transition has a uniquely low energy state?

Yes. Multiple studies and reviews confirm that the thorium-229 nuclear isomeric transition possesses the lowest excitation energy known among nuclear isotopes, making it uniquely suited for nuclear clock development.

Verdict: SUPPORTED · 5 sources for, 0 against · Last checked

The analysis

All relevant retrieved papers consistently state that thorium-229 features an extraordinarily low-energy nuclear isomeric state, which is uniquely positioned for laser excitation and precision metrology compared to any other known nuclear transition. Therefore, the claim is fully supported.

Evidence for · 5
Frequency ratio of the <sup>229m</sup>Th nuclear isomeric transition and the <sup>87</sup>Sr atomic clock.
2024
Thorium-229 nuclei exhibit a uniquely low-energy nuclear transition within reach of VUV laser light sources.
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C, Z., T, O., JS, H., JF, D., L, v. d. W., K, B., A, L., GA, K., P, L., PG, T., T, S., & J, Y. (2024). Frequency ratio of the <sup>229m</sup>Th nuclear isomeric transition and the <sup>87</sup>Sr atomic clock.. doi.org. https://doi.org/10.1038/s41586-024-07839-6

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More for · 4
Controlling <sup>229</sup>Th isomeric state population in a VUV transparent crystal.
2024
The radioisotope thorium-229 is renowned for its extraordinarily low-energy, long-lived nuclear first-excited state.
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T, H., K, O., M, B., K, B., H, F., Y, F., H, H., Y, K., S, K., A, L., T, M., M, G., N, N., R, O., M, P., M, P., N, S., F, S., T, S., M, S., Y, S., K, S., T, S., K, T., S, T., T, W., A, Y., Y, Y., A, Y., & K, Y. (2024). Controlling <sup>229</sup>Th isomeric state population in a VUV transparent crystal.. doi.org. https://doi.org/10.1038/s41467-024-49631-0

The thorium isomer <sup>229m</sup>Th: review of status and perspectives after more than 50 years of research.
2024
The thorium isomer represents the lowest nuclear excitation so far reported in the landscape of nuclear isotopes.
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PG, T., S, K., D, M., & K, S. (2024). The thorium isomer <sup>229m</sup>Th: review of status and perspectives after more than 50 years of research.. doi.org. https://doi.org/10.1140/epjs/s11734-024-01098-2

Laser-based conversion electron Mössbauer spectroscopy of <sup>229</sup>ThO<sub>2</sub>.
2025
The exceptionally low-energy 229Th nuclear isomeric state provides several new applications.
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R, E., JES, T., C, S., HWT, M., HBT, T., UC, P., DA, R., MC, A., L, v. d. W., B, S., K, S., PG, T., A, D., & ER, H. (2025). Laser-based conversion electron Mössbauer spectroscopy of <sup>229</sup>ThO<sub>2</sub>.. doi.org. https://doi.org/10.1038/s41586-025-09776-4

Prospects for measuring the 229Th isomer energy using a metallic magnetic microcalorimeter.
2014
The Thorium-229 isotope features a nuclear isomer state with an extremely low energy.
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Kazakov, G. A., Schauer, V., Schwestka, J., Stellmer, S. P., Sterba, J. H., Fleischmann, A., Gastaldo, L., Pabinger, A., Enss, C., & Schumm, T. (2014). Prospects for measuring the 229Th isomer energy using a metallic magnetic microcalorimeter.. doi.org. https://doi.org/10.1016/j.nima.2013.09.012

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What does the evidence say?

All relevant retrieved papers consistently state that thorium-229 features an extraordinarily low-energy nuclear isomeric state, which is uniquely positioned for laser excitation and precision metrology compared to any other known nuclear transition. Therefore, the claim is fully supported.

Receipt History
first checked06 Aug 2026
judged → SUPPORTED · 8506 Aug 2026
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