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When I say that a nucleus is unstable, does this mean that the nucleus is in its excited state?

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  • 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. – Ambica Govind Jun 06 '21 at 09:32
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    https://physics.stackexchange.com/questions/149400/what-makes-a-nucleus-unstable This should help you. – Ambica Govind Jun 06 '21 at 09:33

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