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¹⁵Be has not been observed. The calculated mass excess is 51.18 MeV: see (1981AJ01). It is calculated to be particle unstable with respect to decay into ¹⁴Be + n by 2.42 MeV. The binding energy of ¹³Be + 2n is +0.31 MeV. See also (1981SE06, 1983ANZQ; theor.).