In theory, a neutrino colliding with an antineutrino is similar to an electron colliding with a positron. If the neutrino/antineutrino pair has enough energy, y

In theory, a neutrino colliding with an antineutrino is similar to an electron colliding with a positron. If the neutrino/antineutrino pair has enough energy, you could produce new particles. Otherwise, they'll just scatter off of each other. Now, because electrons/positrons interact electromagnetically in addition to through the weak force, while neutrinos interact only weakly, how they scatter and the chances to produce new particles will be different. But the processes are conceptually similar.