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¹⁸B has not been observed in the bombardment of Ta by 44 MeV/A Ar ions (1985DE60, 1985LA03, 1986PO13) or in the bombardment of Be by 12 MeV/A ⁵⁶Fe ions (1984MU27). 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 (1978AJ03, 1985WA02). 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^- (1985PO10). See also (1985AN1B) and (1983ANZQ; theor.).