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¹⁴Be has been observed with a production cross section of ~ 10 μb in the 4.8 GeV proton bombardment of uranium (BO73BB, BO74A). It is particle stable: its atomic mass excess is calculated to be 40.69 MeV. ¹⁴Be is then bound by 2.73 and 0.41 MeV, respectively, with respect to decay into ¹³Be + n and ¹²Be + 2n (TH74). See, however, (JE75). ¹⁴Be had not been observed in the bombardment of ²³²Th with 145 MeV ¹⁵N ions (AR70H). See also (AR71M, VO73M), (KO73F, TA73E) and (ST72F, TH72K, BE75Q; theor.).