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Questions about the radioactive decay of nuclei, the radiation emitted in the process of such decay, and the effects thereof on the world. Compare [weak-force] and [nuclear-power].
2
votes
What evidence would there be if radioactive decay changed 7,000 years ago?
It sounds like you're conflating two questions: (1) "What would the geologic record look like if 14C decay changed 7000 years ago?", and (2) "What evidence might there be that the rate had changed?"
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1
vote
What evidence would there be if radioactive decay changed 7,000 years ago?
For radioactivity, the most important example is a process called beta decay (https://en.wikipedia.org/wiki/Beta_decay), in which a down quark emits a $W^-$ boson and becomes an up quark; the $W^-$ then … However, for most unstable nuclei, beta decay is the most common cause of radioactivity.
This is what happens inside Carbon 14. …