double proton emission to 4He for a net reaction of 7B → 4He + 3 1H Has 1 halo(英语:halo nucleus) proton immediately decays into two α particles, for a net reaction
into two 4He atoms for a net reaction of 9Li → 24He + 1n + e− Has 2 halo(英语:halo nucleus) neutrons Immediately decays into two 4He atoms for a net reaction