Haha!

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.124.062502

Here are two news for this subject.

https://phys.org/news/2020-02-isolde-unexplored-region-nuclear-exotic.html

https://home.cern/news/news/physics/isolde-steps-unexplored-region-nuclear-chart

The experiment is simple and elegant. A neutron is put on top of 206Hg, which has N=126 and magic. This extra neutron will populate the next major shell ( N > 126). From the energy and angular distribution measured. We can identify the single-particle energy level, the orbital angular momentum. With the help of DWBA calculation, the occupation or the spectroscopic number can be extracted.

We deduced the single-particle energies and compared with Woods-Saxon calculation. Together with the 209Pb single particle energies. We extrapolating the single-particle energy to the neutron-dripline, where the r-process for heavy nuclear synthesis expected to take place. The result agree with most of the present theoretical calculations. In other word, the present theoretical calculations are seem to be fine.