Note that the energies in the equation above are not the energy released by the reaction. Rather, they are the energies of the neutrinos that are produced by the reaction. 90 percent of the neutrinos produced in the reaction of 7
carry an energy of 6987137947395530700♠ MeV , while the remaining 10 percent carry 6986613633594520999♠ MeV . The difference is whether the lithium-7 produced is in the ground state or an excited ( metastable ) state, respectively.