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The mass of ¹⁹B excess is predicted to be 59.92 MeV (TH74), 60.19 MeV (JA76M, WA76L). Assuming the atomic mass excess to be 60.1 MeV, ¹⁹B is stable with respect to breakup into ¹⁸B + n by 1.8 MeV and into ¹⁷B + 2n by 0.4 MeV [see ¹⁸B]. See also (TH72K, BO74A) and (BE75Q, CA76L; theor.).