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the claim
The thorium-229 nuclear transition has a uniquely low energy state.
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
5 sources for · 0 against

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.

Evidence for · 5
Frequency ratio of the <sup>229m</sup>Th nuclear isomeric transition and the <sup>87</sup>Sr atomic clock.
2024 · cited by 36
Thorium-229 nuclei exhibit a uniquely low-energy nuclear transition within reach of VUV laser light sources.
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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.

More for · 4
Controlling <sup>229</sup>Th isomeric state population in a VUV transparent crystal.
2024 · cited by 9
The radioisotope thorium-229 is renowned for its extraordinarily low-energy, long-lived nuclear first-excited state.
The thorium isomer <sup>229m</sup>Th: review of status and perspectives after more than 50 years of research.
2024 · cited by 3
The thorium isomer represents the lowest nuclear excitation so far reported in the landscape of nuclear isotopes.
Laser-based conversion electron Mössbauer spectroscopy of &lt;sup&gt;229&lt;/sup&gt;ThO&lt;sub&gt;2&lt;/sub&gt;.
2025 · cited by 0
The exceptionally low-energy 229Th nuclear isomeric state provides several new applications.
Prospects for measuring the 229Th isomer energy using a metallic magnetic microcalorimeter.
2014 · cited by 0
The Thorium-229 isotope features a nuclear isomer state with an extremely low energy.
Everything we examined (10)
We also searched for evidence AGAINST this claim, not only for it.
  1. Frequency ratio of the <sup>229m</sup>Th nuclear isomeric transition and the <sup>87</sup>Sr atomic clock.peer-reviewedsupports
  2. Controlling <sup>229</sup>Th isomeric state population in a VUV transparent crystal.peer-reviewedsupports
  3. Chemical Tools to Characterize the Coordination Chemistry of Radionuclides for Radiopharmaceutical Applications.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  4. The thorium isomer <sup>229m</sup>Th: review of status and perspectives after more than 50 years of research.peer-reviewedsupports
  5. Fine-structure constant sensitivity of the Th-229 nuclear clock transition.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  6. Toward the possibility of <sup>229</sup>Th isomeric nuclear state excitation by two-color laser fieldpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  7. Photonuclear Population of &lt;sup&gt;229m,g&lt;/sup&gt;Th in Th-Doped Crystals Toward Nuclear Clock Development.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  8. Laser-based conversion electron Mössbauer spectroscopy of &lt;sup&gt;229&lt;/sup&gt;ThO&lt;sub&gt;2&lt;/sub&gt;.peer-reviewedsupports
  9. A cryogenic Paul trap for probing the nuclear isomeric excited state 229 m Th 3 + .peer-reviewedno side takennot shown: read and judged not to bear on this claim
  10. Prospects for measuring the 229Th isomer energy using a metallic magnetic microcalorimeter.peer-reviewedsupports
The paper trail · every fact has a biography
first checked06 Aug 2026
judged → SUPPORTED · 8506 Aug 2026
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