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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 calculated to be 44.37 MeV (transverse form of the mass equation): it is then stable with respect to decay into ¹⁵B + 2n by 0.73 MeV (1974TH01, 1975JE02). The E_β^-(max) for the decay to ¹⁷C would then be 23.3 MeV. See also (1977WA08) and (1981SE06; theor.).