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¹⁹C has been observed in the 0.8 GeV proton bombardment of thorium (1986VI09) and in the fragmentation of 60 MeV/A argon ions (1987GI1E). The mass excess is 32.30 ± 0.24 MeV (1986VI09), 32.95 ± 0.42 MeV (1987GI1E): the weighted mean is 32.46 ± 0.21 MeV. ¹⁹C is then stable with respect to decay into ¹⁸C + n by 0.53 MeV and into ¹⁷C + 2n by 4.72 MeV. The calculated half-life of ¹⁹C is 1.2 × 10^-2 sec (1984KL06). See also (1978AJ03, 1985WA02, 1986AN07, 1986GU1D) and (1983ANZQ, 1987SA15; theor.).