Questions tagged [nuclear-isomers]

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Nuclear isomers with a long lifetime

A lot of nuclear isomers with long half-lives have N and Z numbers in a range from 39-49 or 69-81. What is the reason for this? Is it possible to explain this with the nuclear shell model?
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By how much are various dibaryon states unbound?

It has been known for a long time that the deuteron is stable but the dineutron (nn) and diproton (pp) are not. Many textbooks comment on this, but all the ones I found so far do not give quantitative ...
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Cm-244 metastable state

While searching for decay product information for Cm-244, I came across the UCSD Radionuclide Data Sheets, which lists the half life for the metastable isomer Cm-244 (34 ms), rather than the nuclear ...
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Have we found all stable nuclear isomers?

Nuclear isomers are metastable nuclear states, typically protected from decay by having very different angular momentum from the ground state. Some are very stable; my favorite $^{180m}$Ta has a half-...