Yesterday I found out there is a nuclide, Beryllium 7, that has a nuclear decay where electron capture from the 2s (L shell) occurs. That's the shell used for chemical bonding in Be so the nuclear decay rate can be varied by changing the chemical environment. The decay rate can be increased by putting Be7 in a buckyball or decreased by ionizing it so that the 2s electrons are lost. That's fucking wild.
References: https://en.wikipedia.org/wiki/Beryllium-7#Decay_chains , Radioactivity gets fast-forward : https://www.nature.com/articles/news040913-24 , Be7 Decay Rate Papers : https://marvin.byu.edu/cgi-bin/res/Be7References?type=Decay
While I'm on the topic of weird nuclei tricks Thorium has an isotope with a metastable excitation state that emits a gamma ray that is such low energy it's in the UV light range, 149.7nm. ref: https://www.nature.com/articles/s41586-019-1533-4
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