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¹⁷B has been observed in the 4.8 GeV proton bombardment of uranium: it is particle stable and its ground state J^π is probably 3/2^- (1974BO05). Its atomic mass excess is estimated by (1985WA02) to be 44.01 ± 0.70 MeV. It is then stable with respect to decay into ¹⁵B + 2n by 1.10 MeV. E_β^-(max) for the decay to ¹⁷C_g.s. would then be 22.98 MeV. See also (1984MU27) and (1983ANZQ, 1985PO10; theor.).