A link to the preprint. I’ll do the actual math on how many transitions/second it works out to later and edit.
I’ve had an eye on this for like a decade, so I’m hyped.
Edit:
So, because of the structure of the crystal the atoms are in, it actually has 5 resonances. These were expected, although a couple other weak ones showed up as well. They give a what I understand to be a projected undisturbed value of 2,020,407,384,335.(2) KHz.
Then a possible redefinition of the second could be “The time taken for 2,020,407,384,335,200 peaks of the radiation produced by the first nuclear isomerism of an unperturbed 229Th nucleus to pass a fixed point in space.”
Japan Rail is holding their breath, this clock might finally be precise enough to guarantee their train schedules.
They need to get one before someone do. They will have none of those people lodging complaint that the train is slow by 2 nanosecond.