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In page Neutrino:

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Antineutrinos were first detected in the 1950s near a nuclear reactor.[citation needed] Reines and Cowan used two targets containing a solution of cadmium chloride in water. Two scintillation detectors were placed next to the cadmium targets. Antineutrinos with an energy above the threshold of 1.8 MeV caused charged current interactions with the protons in the water, an interaction usually known as inverse beta decay, producing positrons and neutrons. This is very much like β+ decay, where energy is used to convert a proton into a neutron, a positron (e+) and an electron neutrino (νe) is emitted:[citation needed]