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Neutrino Mass Evidence - Student Project
Phys4410 Intro. to Nuclear and Particle Physics
Project by Yang, Kyung-Chol

[Neutrinos]   [History about Neutrinos]   [Experimental vs Theoretical]   [Reference]


 ¤ Neutron or Neutrino?

NEUTRINO - After Chadwick's discovery of heavy neutron in 1932, Fermi changed Pauli's neutron into NEUTRINO to distinguish from Chadwick's neutron.




 ¤ Definition of Neutrino

Neutrino

has definition An electrically neutral, very weakly interacting particle, with a rest energy which is either zero or very small. The particle was predicted in 1931 as a means of reconciling the measurements of beta decays with the conservation of energy, but it was not directly detected until 1956.

has definition Chargeless species of particle, subject only to the weak force. An electrically neutral, massless particle of spin-1/2, which interacts only by the weak force and gravity. It was first postulated by Pauli in 1930 to ensure conservation of energy and angular momentum in nuclear decay. Three different types of neutrinos are known to exist corresponding to the three massive leptons: νe, νμ and ντ.

has definition A fundamental elementary particle with no electric charge and very small if any rest mass. Believed to be exceedingly abundant in the universe. The neutrino has a very low cross-section for interaction with matter and is almost impossible to detect, hence the uncertainty over its rest mass. The Sun produces neutrinos from thermonuclear reactions in its core, and a large flux of neutrinos carries away most of the energy, of a supernova. Neutrinos are one candidate for Dark Matter. Experiments to detect cosmic neutrinos involve large masses of "stopping" material and indirect detection of the effects of neutrino absorption.




[Neutrinos]   [History about Neutrinos]   [Experimental vs Theoretical]   [Reference]

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