AskDefine | Define antineutrino

Dictionary Definition

antineutrino n : the antiparticle of a neutrino

User Contributed Dictionary



  1. the antiparticle of the neutrino

Extensive Definition

In physics, antineutrinos, the antiparticles of neutrinos, are neutral particles produced in nuclear beta decay. These are emitted in beta particle emissions, where a neutron turns into a proton. They have a spin of 1/2, and they are part of the lepton family of particles. The antineutrinos observed so far all have right-handed helicity (i.e., only one of the two possible spin states has ever been seen), while the neutrinos are left-handed. Antineutrinos interact with other matter only through the gravitational and weak forces, making them very difficult to detect experimentally. Neutrino oscillation experiments indicate that antineutrinos have mass, but beta decay experiments constrain that mass to be very small.
Because antineutrinos and neutrinos are neutral particles it is possible that they are actually the same particle. Particles which have this property are known as Majorana particles. If neutrinos are indeed Majorana particles then the neutrinoless double beta decay process is allowed. Several experiments have been proposed to search for this process.
Researchers around the world have begun to investigate the possibility of using antineutrinos for reactor monitoring in the context of nonproliferation.

See also

antineutrino in Bengali: প্রতিনিউট্রিনো
antineutrino in Catalan: Antineutrí
antineutrino in Spanish: Antineutrino
antineutrino in Basque: Antineutrino
antineutrino in Korean: 반중성미자
antineutrino in Italian: Antineutrino
antineutrino in Hebrew: אנטי-נייטרינו
antineutrino in Lithuanian: Antineutrinas
antineutrino in Serbian: Антинеутрино
antineutrino in Swedish: Antineutrino
antineutrino in Chinese: 反中微子
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