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²⁰C has been observed in heavy ion projectile fragmentation reactions (1987GI05, 1990MU06, 1991MU19) and in proton-induced target-fragmentation reactions (1987VI13, 1988MU08, 1993WOZZ). The atomic mass excess is 37.560 ± 0.200 MeV (1995AU04). It is then stable with respect to ¹⁹C + n and ¹⁸C + 2n by 3.3 and 3.5 MeV, respectively. β-delayed neutron emission has been observed (1987GI05, 1990MU06, 1991MU19).

The half life and neutron emission probability have been measured to be τ_1/2 = 16⁺¹⁴_-7 ms, P_n = 50 ± 30 (1989LE16) and τ_1/2 = 14⁺⁶_-5 ms, P_n = 72 ± 14 (1990MU06).

Shell model calculations for exotic light nuclei are described in (1988POZS, 1993PO11). Shell model interactions constructed for the 0p1s0d nuclear shell model space are reported in (1992WA22). Self-consistent calculations of light nuclei using the density functional method are reported in (1990LO11). See also the calculation of ground state properties reported in (1996GR21, 1996RE19), and see (1996SH13) for a description of a simple model of neutron "halo nuclei" applied to ²⁰C. Microscopic calculations of beta-decay half-lives for 6 ≤ Z ≤ 108 neutron-rich nuclei are reported in (1990ST08). See also (1987SN01, 1993SA16, 1994HA39).