recently when reading atomic rockets I noticed a entry about spin-aligning neutrons to make them shoot out of the rocket's nozzle instead of randomly flying around to wreck the rocket. 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, antineutrino flying out the other direction, but I knew nothing so I'm probably wrong) to conserve momentum? if that's the case, then could whatever they fly out of be aimed as to ensure that the neutrino is aimed at something?