Information on mass chains and nuclides

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¹⁸Be has not been observed: it is predicted to have a mass excess of 78.43 MeV (1976JA23; and see (1976WA18)). ¹⁸Be is then unstable with respect to breakup into ¹⁶Be + 2n, ¹⁵Be + 3n, ¹⁴Be + 4n, ¹³Be + 5n, ¹²Be + 6n, ¹¹Be + 7n and ¹⁰Be + 8n by, respectively, 3.02, 3.01, 5.42, 2.88, 4.99, 1.75 and 1.25 MeV (using the (1976WA18) masses for the residual nuclei). See also (1974TH01).