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This nucleus has not been observed in the 4.8 GeV proton bombardment of a uranium target. It is particle unstable. Its mass excess is predicted to be 37.97 MeV; it would then be unstable with respect to decay into ¹⁵B + n by 0.93 MeV. See (85WA02, 86AJ04). The ground state is predicted to have J^π = 0^- and the first three excited states are predicted to lie at 0.95, 1.10, and 1.55 MeV [J^π = 2^-, 3^-, 4^-] in a (0 + 1)h-barω space shell model calculation. See (83ANZQ, 85PO10, 86AJ04). Predicted masses and excitation energies for higher isospin multiplets for 9 < / = A < / = 60 are included in the compilation (86AN07). An experiment (85LA1A) involving in-flight identification of fragments from 44 MeV/u ⁴⁰Ar found no trace of ¹⁸B or ¹⁶B and provides strong evidence that ¹⁶B is particle-unstable.