The electron neutrino has a corresponding antiparticle, the electron antineutrino (Ī½e), which differs only in that some of its properties have equal magnitude but opposite sign. One open question of particle physics is whether or not neutrinos and anti-neutrinos are the same particle, in which case it would be a Majorana fermion, or whether they are different particles, in which case they would be Dirac fermions.
Source : Wikipedia
Several experiments are underway at research facilities to try to determine whether neutrinos and anti-neutrinos are in fact the same particle, e.g. GERDA, EXO, and SNO+. (see Wikipedia)
As yet there are no firm results.
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