Information on mass chains and nuclides available on this website:

WWW TUNL

⁶n has not been observed. See (79AJ01, 88AJ01) and references cited there. More recently (90AL40) 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 (89GO18) 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 (97SM07).