>>12033901I remember it having a different setup.
Keep in mind two things :1) conservation of linear momentum and 2) conservation of angular momentum (spin of the nucleus).
You have some cobalt and, using an external magnetic field, you know its spin direction. OK now cobalt becomes nickel, and by 1) you gotta have the products of the reaction going in opposite directions (we're assuming that the cobalt was stationary and the nickel is too).
Co->Ni + e +\bar{\nu}.
By logic alone you can have two scenarios. In one the electron is left handed and the anti-neutrino is right handed. In the other one its the other way around.
What you observe is that the angular distribution of the electrons (which is not linear because of a whole series of factors) is consistent with only one of the scenarios, which is the one with anti-neutrinos that are righthanded.
Voilla! Violation of parity
