Nuclear transmutation is the conversion of one chemical element or an isotope into another chemical element.[1] Because any element (or isotope of one) is defined by its number of protons(and neutrons) in its atoms, i.e. in the atomic nucleus, nuclear transmutation occurs in any process where the number of protons or neutrons in the nucleus is changed.
A transmutation can be achieved either by nuclear reactions (in which an outside particle reacts with a nucleus) or by radioactive decay, where no outside cause is needed.
https://en.wikipedia.org/wiki/Nuclear_transmutation
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