Hm. Do neutrino beams occur naturally in the universe? From my almost illiterate level: It seems like a supernova will produce a bunch of neutrinos in one go.

Hm. Do neutrino beams occur naturally in the universe? From my almost illiterate level: It seems like a supernova will produce a bunch of neutrinos in one go. And they are affected by gravity. So a black hole near with a supernova could act as a gravity lens and "focus" the neutrinos. Does this mean that any nuclear bomb has a (infinitesimal) chance of exploding with 3% of their actual yield, apparently on their own?