GENERAL: See 3 [Electromagnetic Transitions in A = 20] (in PDF or PS), 20.1
[General Table] (in PDF or PS) and 20.2
[Table of Energy Levels] (in PDF or PS) here.
20O decays with a half-life of 13.51 ± 0.05 s to the 1+ states 20F*(1.06, 3.49) with branching ratios (99.973 ± 0.003) and (0.027 ± 0.003)%, log f0t = 3.740 ± 0.006 and 3.65 ± 0.06, respectively (1987AL06). Upper limits for the branching to other states of 20F are shown in Table II of
(1987AL06). See also (1985BR29).
Observed proton groups are displayed in 20.2 (in PDF or PS) and
20.3 (in PDF or PS). 20O*(4.07) decays to
20O*(0, 1.67) with branchings of (26 ± 4) and (74 ± 4)%. The p-γ angular correlations lead to J = 2; the strength of the transition favors
π = +, [δ(E2/M1) = -0.18 ± 0.08 for
the 2+ → 2+ transition.] 20O*(4.46) and
20O*(5.39) decay primarily via 20O*(1.67); the direct ground-state decay
is < 4% for the first and < 7% for the second of these states. The angular
correlations are essentially isotropic, favoring Jπ =
0+. The transition 20O*(5.39 → 4.07) is not observed: the upper limit
is 8%. See also (1978AJ03, 1983AJ01). For a discussion of A = 20 isobaric
states see (1982AN12, 1985AN17).