When I say that a nucleus is unstable, does this mean that the nucleus is in its excited state?
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$\begingroup$ Yes, but only in the case of gamma-decay. In alpha decays, the nucleus is unstable as the ratio of mass number to atomic number is too high; in beta decay, the ratio is too low. $\endgroup$– Ambica GovindCommented Jun 6, 2021 at 9:32
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1$\begingroup$ physics.stackexchange.com/questions/149400/… This should help you. $\endgroup$– Ambica GovindCommented Jun 6, 2021 at 9:33
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