Neutrino mass and mixing are amongst the major discoveries of
recent years. From the observation of neutrino flavor change in
solar and atmospheric neutrino experiments to the measurements
of neutrino mixing with terrestrial neutrinos, recent
experiments have revealed new particle properties of neutrinos
and provided the first hint of physics beyond the Standard
Model of particle physics. These observations have helped solve
the long-standing Solar Neutrino Problem, the apparent deficit
of the observed electron solar neutrino flux, and have
contributed to a better understanding of the role of neutrinos
in the Universe. A broad field of neutrino research has emerged
in particle, nuclear, and astrophysics. The observed phenomenon
of neutrino oscillation not only requires an extension of the
Standard Model but may hold the key to understanding the
observed baryon asymmetry in the Universe. With emphasis on my
research in solar and reactor neutrino physics I will review
the recent discoveries in neutrino physics, describe the
evidence for the mixing of massive neutrinos, and discuss its
implications for neutrino astrophysics and cosmology. I will
conclude with a summary of the outstanding questions in
neutrino particle and astrophysics.
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Physics