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byAltesse ( 698587 ) writes:
Please explain for the layman that I am, how can these neutrinos be so energetic ? I thought neutrinos were very elusive particles that don't interact much with matter, and that's why they're so difficult to detect. With that much energy, these neutrinos should interact with matter and do heavy 'damage', àla cosmic particles, no ?
byAnonymous Coward writes:
The bigger question is how did a chargeless neutrino particle get accelerated to that energy. Most current theories like 2nd order Fermi acceleration act on charged particles bouncing among moving plasma shock waves. Imagine a ping pong ball bouncing between between two walls in a cubic room that are approaching each other. There's no limit to how fast the ball can go because upon each bounce it gains a bit more speed from the wall and it doesn't matter that the ball speed is greatly higher than the wall speed. The walls (standing in for the shock waves) have infinite mass in comparison to the ball (the particle) so they don't effectively slow down much with each reflection.
Probably what happened was there was another particle with charge, it was accelerated to high energy via the standard ways like 2nd order Fermi acceleration and moving in Earth's general direction, then on the way here that particle decayed to produce a neutrino among its products. That's the neutrino that got detected.
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