Anti-electron neutrino
From Conservapedia
The anti-electron neutrino is the antiparticle of the electron neutrino, and as such has an opposite charge and spin. They are emitted when a neutron turns into a proton. It has a mass of <2.2 eV.[1] Like all neutrinos, this particle is affected only by gravity and the weak nuclear force, making it extraordinarily hard to both detect and experiment upon.
