But presumably their nuclei are being overlapped. There would be no way for the atoms to repel. do u even magnets?
that doesn't work quite how you think it works
the question isn't "can we put a particle in the exact same place as another", the question is "can we put an atom in the exact same place as another" which is a very different question because their positions relative to eachother aren't necessarily aligned, nor are they necessarily identical atoms
i'm willing to bet that in some circumstances, with the right atoms, this could lead to fusion. otherwise it'd probably just lead to both of the atoms repelling by fusing into an incredibly unstable element which would fission immediately after