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TUE, 22 SEPT · 78 ITEMS
"Continuous-wave laser absorption spectroscopy of thorium-229 nucleus advances path to optical nuclear clock" — Nature (current) · Science & Medicine
This is a research milestone in the quest for an : researchers used absorption spectroscopy to excite a low-energy in thorium-229 (229Th) embedded in a crystal. Unlike previous work that used pulsed lasers or trapped ions, this continuous-wave approach allows the laser to be stabilized to the nuclear transition, a key step toward a compact, solid-state optical clock that could be more stable and robust than current atomic clocks.
The claim is solid, as it is based on a peer-reviewed Nature paper (s41586-026-11011-7) and corroborated by arXiv preprints and news coverage. The primary source is the Nature publication itself, and the reporting closely reflects its findings, though the exact experimental details (e.g., crystal host, transition frequency) are not fully specified in the highlight.
This is genuinely new research, with the Nature paper and related arXiv preprints appearing in 2026; no recirculation year is indicated.