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USNDP

20O (1987AJ02)


(See Energy Level Diagrams for 20O)

GENERAL: See (1983AJ01) and Table 20.1 [Table of Energy Levels] (in PDF or PS).

Model calculations:(1978WI1B, 1982SH30, 1984CH1V, 1984HA14, 1984RA13, 1984SA37, 1985HA15, 1985HU08, 1985LE1L, 1986COZZ, 1986HE13, 1986HU1G, 1986VO07, 1986WA1R, 1987IA1B).

Complex reactions involving 20O:(1983FR1A, 1983WI1A, 1984HI1A, 1985HA1N, 1985PO11, 1986HA1B, 1986IR01, 1986PO06, 1986PO15, 1987RI03).

Other topics:(1978WI1B, 1983SH32, 1984PO11, 1984SA37, 1985AN28, 1985MU10, 1986AN07).

Ground state of 20O:(1978WI1B, 1983ANZQ, 1984FR13, 1987SA15).

Mass of 20O:From the Q-value of the 18O(t, p)20O reaction the atomic mass excess of 20O is stated to be 3796.3 ± 1 keV (1985AN17). See also (1982AN12, 1985WA02, 1986GU1D).

For B(E2) of 20O*(1.67) and other parameters see (1987RA01) and Table 2 of the Introduction in this publication.

1. 20O(β-)20F Qm = 3.814

20O decays with a half-life of 13.51 ± 0.05 sec 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 branching to other states of 20F are shown in Table II of (1987AL06). See also (1985BR29).

2. 18O(t, p)20O Qm = 3.082
Q0 = 3082.4 ± 1.3 keV (1985AN17). See also (1982AN12).

Observed proton groups are displayed in Tables 20.2 (in PDF or PS) of (1983AJ01) and 20.1 (in PDF or PS) here. 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).

3. 18O(α, 2p)20O Qm = -16.732

See (1983AJ01).

4. 18O(18O, 16O)20O Qm = -0.624

See (1983AJ01).