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From the work of (1967AD05) on the ³He(³He, n)⁵Be reaction (see ⁵Be) it follows that ⁵H is unstable by more than 2.1 MeV to decay into ³H + 2n (using Coulomb corrections based on the 16.7 MeV states in ⁵He - ⁵Li). A study of ⁹Be(α, ⁸B)⁵H at E_α = 129 MeV shows no evidence for sharp ⁵H states for several MeV above ³H + 2n (1968MC02). In ³H(t, p)⁵H, at E_t = 22.25 MeV, a broad peak appears in the proton spectrum which may correspond to a ⁵H state at ³H + 2n + 1.8 MeV, but which could also result from a four-body breakup (1968YO06). A recent study of the ⁷Li(⁶Li, ⁸B)⁵H reaction at E(⁶Li) = 93.3 MeV shows no evidence for the formation of a narrow ⁵H ground state: at θ_lab = 14.7° the yield near the predicted location of the ⁵H_g.s., above the phase-space curve, is ≈ 100 nb/sr. MeV compared to an order of magnitude greater yield for the final state interaction in ⁴H (1977WE03, 1977WE1B). Attempts to observe ⁵H formation in ⁷Li + π^- have also been unsuccessful: see (1974AJ01). See also (1975BE31; theor.).