Neutron halo, tritons and alpha clusters in the nucleus ⁸He

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Recent experiments clearly demonstrate the importance of the excited state 2+ at 1.8 MeV in the substruture ⁶He for the ground state of the nucleus ⁸He. It is shown here that this means that the ground state structure of ⁸He rather than being α + 4n is actually ³H + ³H +2n. As such the pair of tritons would form a compact core around which the two valence neutrons provide a halo structure in ⁸He. Hence both ⁶He and ⁸He are two neutron halo nuclei but with cores of quite different nature. All this demonstrates significance of triton clustering in neutron rich nuclei.