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¹²Li is not observed in the 4.8 GeV proton bombardment of a uranium target: it is particle unstable. The calculated value of its mass excess is 52.93 MeV [see (1980AJ01)]: ¹²Li would then be unstable with respect to ¹¹Li + n ,¹⁰Li + 2n and ⁹Li + 3n by 4.01, 2.96 and 3.76 MeV, respectively. The ground state of ¹²Li is predicted to have J^π = 2^- (1988POZS, 1985PO10; theor.). See also (1980AJ01).