> The fact that it refers to proton decay ... You don't need spontaneous proton decay for the answer to work, just positron emission: https://en.wikipedia.org/

> The fact that it refers to proton decay ... You don't need spontaneous proton decay for the answer to work, just positron emission: https://en.wikipedia.org/wiki/Positron_emission https://en.wikipedia.org/wiki/Positron_emission