In the search for neutrinos, Cowan and Reines discovered the electron anti-neutrino and named it as such. Why is the particle they discovered the anti-variety?
The reason we call electrons 'electrons' and not 'anti-electrons' is because the electrons are the variety we see all around us, as opposed to positrons. Since this makes it seem arbitrary, I figured it would have been more logical for the particle they discovered to just be a neutrino. This makes me believe that it's not just arbitrary, so what exactly was the reason?