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Experiments Create Particles Out of a Vacuum Using Neutrinos
BarbaraHudson writes: In a new series of experiments, scientists report (abstract) that neutrinos, notable for how infrequently they interact with matter, can strike a glancing blow on an atom's nucleus, and the side effect is the generation of a new particle out of a vacuum. Professor Kevin McFarland says the creation of the new particle is what shields the nucleus from being blown apart by the collision. "Producing an entirely new particle – in this case a charged pion – requires much more energy than it would take to blast the nucleus apart – which is why the physicists are always surprised that the reaction happens as often as it does. McFarland adds that even painstakingly detailed theoretical calculations for this reaction 'have been all over the map.'"
pions are basically made up of quarks just like the neutron and the proton: there's nothing magical about it, and has absolutely nothing to do with gravitons (if such even exist except as a mathematical concept). the difference is that pions only contain two quarks (rather than three) and so they're not stable. imagine throwing two magnets into the air very very carefully and having them spin around each other for a very brief period of time. if they fly apart, splat no more particle: if they touch, splat no more particle. but for that incredibly short duration where the two quarks successfully spin around each other in close orbit, there you have a "pion".