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¹³Li is not observed in the 4.8 GeV proton bombardment of a uranium target: the cross section is ≲ 0.2 μb (1974BO05). ¹³Li is predicted to have an atomic mass excess of 61.56 MeV: it is then unstable for breakup into ¹²Li + n and ¹¹Li + 2n by 0.6 and 4.5 MeV, respectively (1974TH01). The modified mass equation leads to a calculated amu of 60.34 MeV: ¹³Li would then be stable with respect to breakup into ¹²Li + n by 0.7 MeV, assuming the amu of ¹²Li to be 52.94 MeV, but would be unstable with respect to ¹¹Li + 2n by 3.3 MeV (1975JE02). See also (1972TH13, 1975BE31).