Information on mass chains and nuclides available on this website:

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¹⁵Li has not been observed. Its atomic mass excess is calculated to be 81.60 MeV: see (81AJ01). It is then unstable with respect to decay into ¹⁴Li + n and ¹³Li + 2n by 1.24 and 3.90 MeV, repsectively.