[ExI] Neutrino interaction web
anders at aleph.se
Sun Mar 6 02:04:14 UTC 2011
I just spent an evening playing boardgames with a neutrino physicist. It
seems that, yes, neutrinos can interact with neutrons. A neutrino can
scatter off neutrons in a simple bounce, scatter and create a pi-0 meso,
or can make it turn into a proton and a suitable lepton (depending on
neutrino type). Neutrons are slightly better than protons since they
have extra energy to turn into other particles, so the neutrino doesn't
have to provide as much kinetic energy for making particles as as in the
case of hitting a proton.
But these reactions are all wimpy weak interactions with low cross
sections. So it is unlikely to matter in practice.
However, an interesting possibility might be if you excited neutrons to
the right energy level, then they might have a resonant absorbtion of
neutrinos of the right energy. Doubtful if we can get that to do any
useful work, but it just might bring the neutrino catcher from absurd to
merely very, very hard.
Future of Humanity Institute
Philosophy Faculty of Oxford University
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