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⁶H was reported in the ⁷Li(⁷Li, ⁸B)⁶H reaction at E(⁷Li) = 82 MeV (1984AL08, 1985AL1G) [σ(θ) ≈ 60 nb/sr at θ = 10°] and in the ⁹Be(¹¹B, ¹⁴O)⁶H reaction at E(¹¹B) = 88 MeV (1986BE35) [σ(θ) ≈ 16 nb/sr at θ ≈ 8°]. ⁶H is unstable with respect to breakup into ³H + 3n by 2.7 ± 0.4 MeV, Γ = 1.8 ± 0.5 MeV (1984AL08), 2.6 ± 0.5 MeV, Γ = 1.3 ± 0.5 MeV (1986BE35). The value adopted in the previous review (1988AJ01) is 2.7 ± 0.3 MeV, Γ = 1.6 ± 0.4 MeV. See also (1987BO40). The atomic mass excess of ⁶H using the (1995AU04) masses for ³H and n, is then 41.9 ± 0.3 MeV. There is no evidence for the formation of ⁶H in the ⁶Li(π^-, π⁺) reaction at E_π^- = 220 MeV as reported in (1990PA25). (1991SE06) shows that the continuum missing mass spectra can be explained in terms of the presence of dineutrons in the breakup products. An analysis of the proton spectra for the ⁷Li(π^-, p) reaction (1990AM04) showed no evidence for ⁶H.

The ground state of ⁶H is calculated to have J^π = 2^-. Excited states are predicted at 1.78, 2.80 and 4.79 MeV with J^π = 1^-, 0^- and 1⁺ [(0 + 1)ℏω model space] (1985PO10) [see also for (0 + 2)ℏω calculations]. See also the additional references cited in (1988AJ01).