Mar 21, 2001
Neutrino Mass from Super-Kamiokande
Dr. Henry W. Sobel, University of California, Irvine
Super-Kamiokande is a 50,000 ton water Cherenkov detector operating at a
depth of 1000 meters beneath the Japanese Alps. It was built by a Japanese
and American collaboration over a period of five years. The detector is used
to study neutrinos which originate in the Sun and in the Earth's atmosphere
and to search for nucleon decay. In June, 1998 the Super-Kamiokande
collaboration announced the observation of a significant, angle dependent
deficit of upward- going muon neutrinos relative to downward going ones.
Since neutrinos are produced isotropically in the Earth's atmosphere, this
deficit has been interpreted as a manifestation of a process known as
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