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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 (79AJ01). See also (86GI10, 87AB1M), (84AJ01, 85AL1G, 87PE1C) and (82KA1D, 83ANZQ, 83FE07, 84VA06, 85PO10, 86AB10, 88PO1E; theor.).