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At E(⁹Be) = 121 MeV, ¹⁰Li has been observed in the ⁹Be(⁹Be, ⁸B)¹⁰Li reaction with a differential cross section (c.m.) of ≈ 30 nb/sr at θ = 14° (lab): Q₀ = -34.06 ± 0.25 MeV, and the atomic mass excess of ¹⁰Li is 33.83 ± 0.25 MeV if the group observed (Γ ≈ 1.2 ± 0.3 MeV) corresponds to the ground state. ¹⁰Li_g.s. would then be unbound with respect to breakup into ⁹Li + n by 0.80 ± 0.25 MeV: see (1979AJ01). See also (1986GI10, 1987AB15), (1984AJ01, 1985AL1G, 1987PE1C) and (1982KA1D, 1983ANZQ, 1983FE07, 1984VA06, 1985PO10, 1986AB10, 1988POZS; theor.).