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²⁰Mg has been populated in the ²⁴Mg(α, ⁸He) reaction [see (78AJ03)], and in the ²⁰Ne(³He, 3n) reaction at 70 MeV (AY81, MO79). The super-allowed decay of ²⁰Mg to the first T = 2 (J^π = 0⁺) state of ²⁰Na [E_x = 6.57 ± 0.05 MeV] has been reported from observations of the subsequent decay of that state by proton emission [see Fig. 12]. The partial half-life is 95⁺⁸⁰_-50 msec leading to a branching ratio of (3 ± 2)% for the super-allowed decay; log ft = 3.18. The results for A = 20 are in agreement with the quadratic form of the IMME (AY81). See also (78AJ03) and (BE79A, TR80D, HA81S).