As far as I know the size in these discussions is some kind of scattering cross-... | Hacker News

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contravariant on Feb 4, 2022 | parent | context | favorite | on: Protons are probably smaller than long thought

As far as I know the size in these discussions is some kind of scattering cross-section. So roughly it's just how likely you are to hit it / how precise you need to aim.

I don't know the exact details of the definition though.

davrosthedalek on Feb 4, 2022 [–]

That's one way to determine the size. But the same thing pops up in spectroscopy.

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