antineutrino

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antineutrino

[′an·tē·nü¦trē·nō]
(particle physics)
The antiparticle to the neutrino; it has zero mass, spin ½, and positive helicity; there are two antineutrinos, one associated with electrons and one with muons.
References in periodicals archive ?
Besides the hint of sterile neutrinos, the Daya Bay results reveal a second strange feature--an excess of electron antineutrinos (compared with theoretical predictions) at an energy of around 5 million electron volts.
The LSND found that muon antineutrinos beamed into 167 tons of mineral oil had morphed into electron antineutrinos in a way that seemed to require a fourth type of neutrino to exist.
According to Fermilab physicist Dan Hooper, who is not part of MiniBooNE, the excess could be because muon antineutrinos turn into sterile neutrinos before becoming electron antineutrinos, reports The New Scientist.
The researchers, who had expected to detect 23 electron neutrinos and seven electron antineutrinos, observed 32 electron neutrinos and 4 electron antineutrinos.
These compounds emit light, or scintillate, when struck by fast-moving electrons such as those generated during complex reactions triggered when electron antineutrinos strike protons in the detector fluid.
After 145 days of observations at KamLAND, the experimenters report detecting only 63 percent of the electron antineutrinos that they had expected from calculations based on the reactors' output.
In two runs, the second completed last November, the team detected 29 events indicating the presence of electron antineutrinos, which normally would be absent.

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