Recently, when reading about atomic rockets, I noticed an entry about spin-aligning neutrons to make them shoot out of the rocket's nozzle instead of randomly flying around to wreck the rocket.

Neutrinos, like neutrons, are uncharged, so they can't be aimed using electromagnetic fields, either.

What I noticed is that, since neutrinos also should have a very tiny momentum, wouldn't they also get emitted in the exact opposite direction of something (my guess is that for beta decays it should be the electron on one side, the antineutrino flying out the other direction, but I know nothing so I'm probably wrong) to conserve momentum? If that's the case, then could whatever they fly out of be aimed so as to ensure that the neutrino is aimed at something?