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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.
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).
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).
See (1983AJ01).
See (1983AJ01).
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