This is probably a very basic question about notation. If we have the following notation for Boron nuclei:
$$^{12}_5 B(1^+)\;\text{or}\; ^{10}_3B(3^+)$$
What does the number in the parentheses mean? I guess $1$ and $3$ correspond to a spin number and $\pm$ to the parity. But what spin is that exactly and how do you find it?
