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¹⁸B has not been observed in the bombardment of Ta by 44 MeV/A Ar ions (DE85Q, LA85I, PO86L) or in the bombardment of Be by 12 MeV/A ⁵⁶Fe ions (MU84E). ¹⁸B has been predicted to have a mass excess of 53.85 MeV. It would then be unstable with respect to ¹⁷B + n by 1.8 MeV: see (78AJ03, WA85C). ¹⁸B is calculated to have J^π = 4^- and to have excited states at 0.62, 0.86 and 1.59 MeV with J^π = 1^-, 2^- and 2^- (PO85F). See also (AN85A) and (AN83D; theor.).