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20C (1987AJ02)(Not illustrated) 20C has been observed in the fragmentation of 60 MeV/A argon ions: its mass excess is 37.20 ± 1.13 MeV (1987GI1E). It is then stable with respect to 19C + n and 18C + 2n by 3.3 and 3.9 MeV, respectively. See also (1978AJ03, 1983AJ01). The half-life of 20C is calculated to be 9.3 × 10-3 sec (1984KL06). See also (1985AN1B, 1985LA03, 1986AN07, 1986GU1D) and (1982AV1A, 1983ANZQ, 1987SA15; theor.).
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