This isn't really my area (I'm a mechanical engineering graduate), but I thought maybe somebody on the forum could give me feedback or help redirect my thinking if this is not right. So, neutrinos are famous for not really doing anything, just kind of being there (by this I mean being the product of decay or stellar reactions, or both, anyway...). So, like many a scientist before, I am asking a favorite question: What can we point a neutrino beam at that will actually do something? Since spatially, the interactions between nuclei and neutrinos are rare because nuclei are small relative due to the different forces at work in the nucleus, and the electrons holding elements/molecules together at distances orders of magnitude greater than the nuclei. So, I was thinking, besides testing elements to see which ones react with neutrinos (which it's my understanding that basically none of them do), maybe we could do a more dynamic kind of experiment. Maybe, one could point a particle accelerator beam at a target, and have a nuclear reaction (maybe low level) going on the other side. So, the neutrinos would fly through the space occupied by the nuclear reaction in progress. It might not do anything, but maybe it would. Perhaps, the presence of neutrinos would slow down the rate of reaction, or speed up the rate or reaction, or have some other interesting kind of effect (though I honestly don't know what would be more interesting than being able to control a nuclear reaction with a neutrino beam). Any comments? I can't say I'm confident this is a novel or interesting idea, but I thought I'd see what people who know this kind of stuff think about something along these lines.