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⁶n has not been observed. See (1979AJ01, 1988AJ01) and references cited there. More recently (1990AL40) reports a search for ⁶n in a ¹⁴C(⁷Li, ⁶n) activation experiment at E(⁷Li) = 82 MeV. No evidence for ⁶n was obtained.

The method of angular potential functions was used by (1989GO18) in a calculation of the properties of multi-neutron systems which indicated that these systems have no bound states. The ground state energy of a six-neutron drop has been computed with variational and Green's function Monte Carlo methods (1997SM07).