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¹⁸B has not been observed in the bombardment of Ta by 44 MeV/A Ar ions (85DE1A, 85LA03, 86PO13) or in the bombardment of Be by 12 MeV/A ⁵⁶Fe ions (84MU27). ¹⁸B has been predicted to have a mass excess of 52.3 MeV (93AU05). It would then be unstable with respect to ¹⁷B + n by 0.5 MeV: see (78AJ03, 85WA02). 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^- (85PO10). The shell model calculations of (92WA22) predict J^π = 2^- for the ground state with the first three excited states at 0.45, 0.52, 0.839 MeV with J^π = 4^-, 2^-, 3^-. See also (87AJ02, 88GU1A).