I am trying to get to grips with nuclear spin. However I note that many of the spin of isotopes can have many results. For example, if one looks on the Wikipedia page for the isotopes of lithium, the spin of 10Li, ground state, is quoted as (1−,2−). And it says
The values of spin with weak assignment arguments are enclosed in parentheses.
So what does that mean, we don't know what the spin is? Does 10Li have two spins?
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