Abstract

In the Standard Model of particle physics neutrinos are massless. However, in 1998 it was shown beyond doubt that neutrinos possess a non-vanishing rest mass. Neutrinos can transform from one flavour into another one, with a transition probability that changes periodically. These neutrino oscillations are a quantum mechanical interference effect on macroscopic distances, whose basic features and important experiments will be discussed. The precise value of the neutrino mass is a currently unresolved problem, we will discuss the most important approaches to determine it. Neutrinos have the option to be identical with their antiparticles. This would lead to processes that violate lepton number conservation.

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