Fusion
1H1 + 1H1 1D2 + +1?0 + ? + energy
1H1 + 1D2 1T3 + +1?0 + ? + energy
so we have four hydrogens becoming one helium, with about 24 MeV of energy and two neutrino’s produced plus two positrons which will combine with the extra two electrons from the 4 H’s to give another 2 MeV’s of energy.