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**Previous Measurements**
Decay to ²⁰F* (MeV)	J^π	β^--decay Branching Ratio (%)			log f₀t			E_γ (keV) (E_f → g.s.)	γ-ray Branching Ratio (%)
Decay to ²⁰F* (MeV)	J^π	(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 E_β(max) = 2.76 MeV and T_1/2 = 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).

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

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