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20Mg (1983AJ01)
(See the Isobar Diagram for 20Mg)
20Mg has been populated in the 24Mg(α, 8He) reaction [see (1978AJ03)], and in the 20Ne(3He, 3n) reaction at 70 MeV (1981AY01, 1979MO02). The super-allowed decay of 20Mg to the first T = 2 (Jπ = 0+) state of 20Na [Ex = 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 (1981AY01). See also (1978AJ03) and (1979BE1H, 1980TR1E, 1981HA2C).