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¹¹Li has been observed in the bombardment of iridium by 24 GeV protons. Its mass excess is 40.94 ± 0.08 MeV (TH75B). The cross section for its formation is ~ 50 mb (TH76G). ¹¹Li is bound: E_b for break up into ⁹Li + 2n and ¹⁰Li + n are 158 ± 80 and 960 ± 250 keV, respectively [see (79AJ01) for discussions of the masses of ⁹Li and ¹⁰Li]. The half-life of ¹¹Li is 8.5 ± 0.2 msec (RO74R): it decays to neutron unstable states of ¹¹Be [P_n = (60.8 ± 7.2)%: (RO74R)]. Since systematics suggest J^π = 1/2^- for ¹¹Li_g.s., the remainder of the decay is presumably to ¹¹Be*(0.32) (J^π = 1/2^-). Log ft = 5.0 (TH75B). (BA77N; theor.) suggest that the ground state of ¹¹Li has large admixtures of higher configurations and that the mass of ¹¹Li should be used with caution in mass equations. These calculations predict a large fraction of high energy neutrons suggesting that the actual P_n is greater than 61% (BA77N). See also (TO73G, HA74CC, 75AJ02) and (TA73E, BE75Q, JE75, IR76C; theor.).