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¹⁸C is particle stable. It has been observed in the bombardment of ²³²Th by 122 MeV ¹⁸O ions (1969AR13) and by 172 MeV ²²Ne ions (1975VO09) and in the 4.8 GeV proton irradiation of uranium (1974BO05). At E_p = 4.8 GeV, the production cross section is ≈ 100 μb (1974BO05). See also (1972AJ02).

The atomic mass excess of ¹⁸C is calculated to be 25.37 MeV by (1977WA08), and we adopt this value. The binding energy of a neutron in ¹⁸C is then 3.76 MeV and of two neutrons is then 4.46 MeV, using the (1977WA08) masses for ¹⁷C and ¹⁶C. For other recent mass calculations of ¹⁸C see (1974TH01, 1975JE02, 1976JA23). See also (1972TH13, 1973TO16, 1976WA18, 1977AR06, 1977BH1B) and (1971ST40, 1973WI15, 1975BE31, 1976BE1G; theor.).