And exactly what is the use of these electron antineutrinos?
Because neutrinos have such a tiny interaction with matter they go from the core of a star right into space without much blockage. It is a good way to test if a theory of nuclear physics is any good. In fact for a long time the measured amount was one third of the predicted amount from fusion inside the sun. It was discovered latter on that neutrinos come in 3 types that switch around in flight.
Good nuclear physics makes great bombs that keeps our enemies from attacking us.