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¹³Li has not been observed. 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 (TH74). The modified mass equation leads to a calculated atomic mass excess of 60.34 MeV: ¹³Li would then be stable with respect to breakup into ¹²Li + n by 0.7 MeV, assuming the a.m.u. of ¹²Li to be 52.94 MeV, but would be unstable with respect to ¹¹Li + 2n by 3.3 MeV (JE75). See also (76AJ04).