20O

β--Decay Evaluated Data



Measurements
1960SC01: 20O; measured not abstracted; deduced nuclear properties.
1970MA42: 20O; measured T1/2, Eγ, Iγ; deduced log ft.
1974AL09: 20O; measured Eγ, Iγ, T1/2, deduced log ft. 20F levels deduced γ-branching.
1985AN17: 20O(β-); deduced Q. Mass excess data input.
1987AL06: 20O(β-); measured Eγ, Iγ; deduced β- branching, log ft. 20F levels deduced γ-branching, allowed, first-forbidden unique, nonunique transition strength.
2009LI51: 20O(β-); measured Eγ.

Measured half-life for 20O(β-)20F

Recommended value (July, 2015): 13.51 ± 0.05 sec
Summary Table of Uncertainty Analysis:    Table 20O preview (PDF)  
Measured values: 13.49 ± 0.05 sec (1974AL09)
13.57 ± 0.1 sec   (1970MA42)
13.6 ± 1.0 sec (1960SC01)

Previous Measurements

 

Decay to 20F*
(MeV)
Jπ β--decay Branching Ratio (%) log f0t Eγ (keV)
(Ef → g.s.)
γ-ray
Branching Ratio
(%)
(1970MA42) (1974AL09) (1987AL06) (1970MA42) (1974AL09) (1987AL06) (1983AJ01)
0.66 3+   < 0.04     > 7.4      
0.82 4+   < 0.10     > 6.9      
0.98 1- < 0.6 < 0.03 < 0.028 > 6.0 > 7.3 > 7.34 983.68 ± 0.20 ≥ 96
1.06 1+ 100.0 100.0 99.973 ± 0.003        3.73 a 3.74 ± 0.01 b 3.740 ± 0.006 1056.818 ± 0.004 e      > 99.9 e
1.31 2- < 0.8 < 0.11 < 0.014 > 5.7 > 6.5   > 7.41 c 1309.29 ± 0.20    100
1.82 5+   < 0.06     > 6.3      
1.84 2- < 1.9 < 0.13 < 0.027 > 4.8 > 6.0   > 6.68 d 1843.88 ± 0.30   ≥ 94
1.97 (3-) < 1.4 < 0.08   > 4.8 > 6.1      
2.04 2+ < 2.0 < 0.12   > 4.6 > 5.8      
2.19 3+ < 1.0 < 0.11   > 4.7 > 5.7      
3.17 (0-, 1+)     < 0.012     > 5.08 2188.74 ± 0.47 f > 95
3.49 1+       0.027 ± 0.003     3.65 ± 0.06 3488.21 ± 0.10 e 64 ± 4 g
a) Using Eβ(max) = 2.76 MeV and T1/2 = 13.57 ± 0.1 sec.
b) Compares with a theoretical value of 3.86 (1973LA03).
c) log f1t > 8.67 (1987AL06).
d) log f1t > 7.75 (1987AL06).
e) From (1987AL06).
f) This transition is to 0.98 MeV state.
g) From (1983HU12).

20C(β-)20N Evaluated Data

20N(β-)20O Evaluated Data

20F(β-)20Ne Evaluated Data

20Na(β+)20Ne Evaluated Data

20Mg(β+)20Na Evaluated Data

A = 20 Beta-Decays Diagram

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Last modified: 21 May 2018