ND280 also investigates various types of muon and electron neutrino and antineutrino interactions. The antineutrino discovered by Cowan and Reines is the antiparticle of the electron neutrino. Gargamelle ran alternately in a neutrino and an antineutrino beam. Gargamelle was designed for neutrino and antineutrino detection. The boson then decays into an electron and an electron antineutrino. For example, CP transforms a left-handed neutrino into a right-handed antineutrino. The virtual W boson then decays into an electron and an antineutrino. An antineutrino is emitted, as in all negative beta decays. It decays into Be by the emission of an antineutrino and an electron. The masses lie below the Mainz-Troitsk upper bound of for the electron antineutrino. E is the antineutrino energy (in MeV). It was not the experimental goal to measure the total antineutrino flux. The total number of antineutrino events was 152, of which 4.5 to 54.2 were geoneutrinos.