# New results on the laser-accessible nuclear transition in Thorium-229

- Institution: CERN
- Department: CERN Colloquium
- Speaker: Thorsten Schumm
- Year: 2020
- Language: English
- Subjects: Physics
- Source: [CERN](https://videos.cern.ch/record/3000401)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

The radio isotope Thorium-229 is expected to present a remarkably low-energy excited (isomer) state of the nucleus which is expected around 10 eV. It might hence be possible to directly excite the atomic nucleus with UV (laser) radiation, creating a bridge between atomic and nuclear physics. The (expected) narrow line width of the transition and the intrinsic robustness of nuclear transitions to external fields makes it a promising candidate for a new frequency standard - a "nuclear clock". In this presentation we will review the current state of knowledge on the low-energy nuclear transition in Thorium-229 and the ongoing quest to measure it's exact energy.

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## Lectures

1. [New results on the laser-accessible nuclear transition in Thorium-229](https://invisiblenetwork.ai/learn/cern/3000401/c66fbf0df0d9), 1 h 5 min (CERN's player)