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A comment on Exotic Atom. Parent comment

Re:Exotic Atom by _Microft on Sunday March 10, 2019 @04:14PM (#19354136)
Proton decay has never been observed, afaik.

Edit: that's still the case. Since protons can not decay in the standard model, actually observing it would be huge.

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Re:Exotic Atom by NZGumboot on Monday March 11, 2019 @07:59PM (#19364116)
Free protons (protons outside of an atom) have never been observed to decay. Protons inside a nucleus can of course decay, see: https://en.wikipedia.org/wiki/Positron_emission
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