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18C (1972AJ02)(Not illuatrated) 18C is particle stable. Therefore its atomic mass excess, M - A, must be < 29.84 MeV [16C + 2n] (1970WA1G). 18C has been observed in the bombardment of 232Th by 122 MeV 18O ions (1969AR13, 1970AR1D) and in the 3 GeV proton bombardment of Au (1970RA1A). See also (1960ZE03, 1968PO04, 1971BU1E).
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