Introducing TIB

Knowing the wavelength of the Th-229 isomer transition is utterly important, as it determines which schemes for a nuclear clock will work, and which ones will not. This value, however, is not yet known precisely, and it is one of the first aims of nuClock to determine the transition wavelength.

To add some fun to the search, we are introducing TIB, the Thorium Isomer Bet. Here’s how it works: Make a guess of what the transition wavelength λ is, and quantify how certain you are about your bet (Δλ). Towards the end of the nuClock project, we will determine the actual value λ0 and its uncertainty Δλ0, based on latest measurements. Whoever came closest to the actual value will be invited to the final nuClock meeting, held in June 2019 in Vienna, and receive a mighty jéroboam (3-liter) bottle of champagne!

To join the game, send your values of λ and Δλ (in nanometers) to Simon. Everyone (expert or not, within or outside of nuClock) is invited, bets are accepted until the end of this year.

For the experts: Each bet will be modelled as a laser of wavelength λ, linewidth Δλ, and unit intensity, and we will calculate how many Th nuclei each laser can excite, using the Lorentzian-type expression for off-resonant excitation. Largest number N wins!


TIB formula