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  2. Nuclear fusion - Wikipedia

    en.wikipedia.org/wiki/Nuclear_fusion

    The (intermediate) result of the fusion is an unstable 5 He nucleus, which immediately ejects a neutron with 14.1 MeV. The recoil energy of the remaining 4 He nucleus is 3.5 MeV, so the total energy liberated is 17.6 MeV. This is many times more than what was needed to overcome the energy barrier.