neutrino

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neutrino

 [noo-tre´no]
a subatomic particle with an extremely small mass and no electric charge.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

neutrino

(nū-trē′nō)
In physics, a subatomic particle at rest, with no mass and no electric charge. These particles are constantly flowing through the universe and are not known to affect the matter through which they pass.
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
When the [phi]-particle's mass is zero ([m.sub.0] = 0), the Tau-neutrino is in its natural state of being an Tau-neutrino and when the mass of the [phi]-particle is negative (-[m.sub.0]), the Tau-neutrino enters the Electron-neutrino state and likewise, when mass of the [phi]-particle is positive (+[m.sub.0]), Muon-neutrino enters the [mu]-neutrino state.
The upper bounds of the neutrino mass are about 4.7 eV for the electron-neutrino, 170 keV for the muon-neutrino, and 18 MeV for the tauon-neutrino.
Ajima et al., "First muon-neutrino disappearance study with an off-axis beam," Physical Review D, vol.