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RE: A breakthrough in astrophysics - observation of a first powerful engine to accelerate cosmic rays
I do have one question, do you know how the direction of the neutrino's are determined?
They travel straight. From the tracks they leave in the detector, we can reconstruct the initial trajectory and then get the direction where they come from.
Oh OK, it makes sense to me now as the individual sensors are laid out in a cube matrix. It is quite clever in that they use the ice to create the detector structure :)
Antarctica ice is a perfect medium for such a detection. Ice is in general clean dark and stable. Antarctica is then the only place on Earth where ice is so abundant. It is now more than 30 years that neutrino physics live nice days in Antarctica :)