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 Quote by PAllen Right. Of course, since the cross section is proportional to neutrino energy squared, and the given figure is ballpark for 1 Mev neurtrinos, if you consider 1 ev neutrinos, you have mean free path of 10^15 cm, even through neutron star core material. So very low energy neutrinos are the ultimate ghost particles.
Based on what we think we knew last week. So when the recent studies in Japan are confirmed, it's either as we thought last week or we have to consider our model flawed in that we had thus far only considered neutrinos of a given type, but now with the possibility that some are linking to a higher state to become a charged particle, we would have to assume an impact; or something else that changes the environmental conditions.