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¹⁵B has been observed in the 5.3 GeV proton bombardment of uranium (1966PO09) and in a study of the ¹⁴C(⁹Be, ⁸B)¹⁵B reaction at E(⁹Be) = 120 MeV (1974CE1D). See also (1971AR02). It is particle stable. Its mass excess is calculated to be 29.89 MeV (1975JE02): the binding energies for ¹⁴B + n and ¹³B + 2n are then 1.84 and 2.82 MeV, respectively, based on the (1971WA37) masses except for ¹⁴B [for which see "Mass of ¹⁴B" in the "GENERAL" section of ¹⁴B]. For other calculations of the mass of ¹⁵B see (1970WA1G, 1972TH13, 1973BA34, 1974TH01, 1975BE31). See also (1972CE1A, 1973KO1D, 1973TO16).