How to Tell a Neutrino from a Hole in the Ground
Physics Department, Queen's University; Director, Sudbury Neutrino Observatory
Thu. March 11, 2004 7:30 PM Theatre of the Royal Ontario Museum, Toronto|
Neutrinos, along with electrons and quarks, are presently thought to be fundamental building blocks of matter
particles that we do not know how to subdivide further. Neutrinos are the least known of these particles because they have very small mass, interact only through the weak force, and penetrate through vast amounts of material without stopping. Neutrinos are produced copiously by the nuclear reactions that power the Sun and these solar neutrinos, if detected, can tell us a lot about the Sun and about neutrinos themselves. Canada has two tremendous advantages in the detection of neutrinos through large reserves of heavy water (used in the CANDU style of nuclear reactor) and an ideal site 2 km underground, away from the cosmic rays that would prevent the detection of neutrinos.
The Sudbury Neutrino Observatory (SNO), in INCO's Creighton mine near Sudbury has performed unique measurements of neutrinos that confirm our theories of the Sun in great detail and exhibit new properties of neutrinos that go beyond the previously accepted basic theories of physics. The SNO story to date will be told, including the enormous efforts required to build an experiment the size of a ten story building with ultra clean conditions in an active nickel mine and the very fundamental scientific results that have been obtained. Exciting future experiments in the expanded SNOLAB underground facility now under development will also be discussed.
|This is the Foundation Lecture sponsored by NSERC and the Royal Canadian Institute. Refreshments will be served afterwards.|
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