Many Borromean nuclei are light nuclei near the nuclear drip lines that have a nuclear halo and low nuclear binding energy. For example, the nuclei He, Li, and C each possess a two- neutron halo surrounding a core containing the remaining nucleons. These are Borromean nuclei because the removal of either neutron from the halo will result in a resonance unbound to one- neutron emission, whereas the dineutron (the particles in the halo) is itself an unbound system. Similarly, Ne is a Borromean nucleus with a two-proton halo; both the diproton and F are unbound.