1954WO23: ²⁰F; measured T_1/2.

1959VA10: ²⁰F; measured T_1/2.

1960SC01: ²⁰F; measured not abstracted; deduced nuclear properties.

1962MA38: ²⁰F; measured not abstracted; deduced nuclear properties.

1963GL01: ²⁰F; measured not abstracted; deduced nuclear properties.

1967FL16: ²⁰F; measured T_1/2, E_γ.

1967YU01: ²⁰F; measured T_1/2.

1969GA05: ²⁰F; measured I_γ; deduced log ft, β-branching. ²⁰Ne deduced levels.

1970WI05: ²⁰F; measured T_1/2; deduced log ft.

1975AL27: ²⁰F; measured T_1/2; deduced β-decay mirror asymmetry. ²⁰F deduced log ft.

1976GE08: ²⁰F; measured T_1/2, β-spectrum; deduced shape factor, ft, E_β, Q.

1980HE08: ²⁰F; measured β-decay asymmetry.

1981AL13: ²⁰F; measured E_γ, I_γ; deduced log ft, I_β. ²⁰Ne deduced level.

1986HEZY: ²⁰F(β^-); measured shape factors.

1987VA20: ²⁰F(β^-); measured βrum shape.

1988RO10: ²⁰F(β^-); measured βγ(θ); deduced pseudotensor form factors.

1992WA04: ²⁰F; measured I_γ(t). ²⁰F level deduced T_1/2.

1993MA72: ²⁰F(β^-); compiled, reviewed T_1/2 data.

1995ITZY: ²⁰F(β^-); measured decay products, E_γ, I_γ; deduced T_1/2.

1996MIZW: ²⁰F(β^-); measured β-NMR, polarization; deduced μ.

2002MO44: ²⁰F(β^-); measured β-asymmetry; deduced source polarization.

2007NA39: ²⁰F(β^-); measured β angular distribution from nuclear spin aligned nuclei.

2007NAZT: ²⁰F(β^-); measured I_β(θ, H, t) from polarized source.

2007WI09: ²⁰F(β^-); measured E_β, E_γ, E_α. Deduced first forbidden decay branching ratios.

2008NAZX: ²⁰F(β^-); measured E_β, I_β, θ(β), E_γ, I_γ, θ(γ) from aligned nuclei.

2009LI51: ²⁰F(β^-); measured E_γ.

2011MI18: ²⁰F(β^-); measured E_β, β(θ), βγ(θ) from nuclear spin-polarized nuclei using β-NMR technique; deduced G-parity-violating, second-class current (SCC) induced tensor term.

2018HU05: ²⁰F(β^-); measured γ radiation, β-γ-coin, half-life of ²⁰F.

2019BU01: ²⁰F(β^-); measured T_1/2 of ²⁰F_g.s.; deduced recommended average half-life by considering a selection from compiled previous experimental values.

2019KI08: ²⁰F(β^-); measured decay products, E_β, I_β; deduced transition strength.

2019KI10: ²⁰F(β^-); measured E_β, I_β, branching ratio of the 2⁺ to 0⁺ β transition to the ground state of ²⁰Ne; deduced log ft value for the second-forbidden, nonunique β transition.

Measured half-life for ²⁰F(β^-)²⁰Ne

Recommended value (January, 2019):	11.056 ± 0.084 sec	(Method of Best Representation)
Summary Table of Uncertainty Analysis:	(PDF);	Summary chart of all values:    (PDF)
Measured values:	11.016 ± 0.016 sec	(2019BU01: 11.0160 ± 0.0041stat ± 0.0150sys sec)
	11.0011 ± 0.0075 sec	(2018HU05: 11.0011 ± 0.0069stat ± 0.0030sys sec)
	11.11 ± 0.04 sec	(1995ITZY)
	11.03 ± 0.05 sec	(See 1993MA72)
	11.163 ± 0.008 sec	(1992WA04)
	11.03 ± 0.06 sec	(1987MI39)
	11.18 ± 0.01 sec	(1976GE08)
	10.996 ± 0.020 sec	(1975AL27)
	11.03 ± 0.06 sec	(1970WI05)
	10.81 ± 0.11 sec	(1967FL16)
	10.31 ± 0.07 sec	(1967YU01) (Excluded)
	11.36 ± 0.07 sec	(1963GL01)
	11.56 ± 0.05 sec	(1962MA38) (Excluded)
	11.2 ± 0.1 sec	(1960SC01)
	12.5 ± 2.0 sec	(1959VA10)
	11.4 sec	(1954WO23) (Excluded)
Other Reviews:	11.150 ± 0.021 sec	(Our analysis in August, 2015)
	11.076 ± 0.099 sec	(Our analysis in June, 2018)
	11.0062 ± 0.0080 sec	(2019BU01: based on 6 precise measured values)

Previous Measurements

 

Decay to 20Ne* (MeV)	Jπ	Branching Ratio (%)		log ft		Eβ(max) (MeV)
0	0+	(1954WO23)	< 0.032 a	(1954WO23)	>/≈ 9	(1952AL26, 1952AL30)	5.406 ± 0.017
1.63 b	2+	(1975AL27)	99.98	c	4.97	(1954WO23)	5.419 ± 0.013
				(1954WO23)	4.99	(1959AL06)	5.416 ± 0.015
				(1975AL27)	4.972 ± 0.001
4.25	4+	(1969GA05)	< 0.015
4.97 d	2-	(1969GA05)	0.017 ± 0.003	(1969GA05)	6.89 ± 0.08
		(1981AL13)	0.0090 ± 0.0004	(1981AL13)	7.16 ± 0.02 e
		(1987AL06)	0.0082 ± 0.0006	c	6.88
				f	7.20 ± 0.03 e
5.62	3-	(1963GL01)	< 0.048
5.78	1-		< 0.1
6.72	0+		< 0.67
7.00	4-		< 0.2

a) The upper limit for the ground-state decay is 0.001% [log f0t > 10.5] (1978CA02).

b) Eγ(1.63 → 0) = 1631 ± 6 keV (1952AL26, 1952AL30), 1627 ± 5 keV (1954WO23), 1632.6 ± 0.8 keV (1966AL12), 1634.8 ± 0.6 keV (1967VA08), 1633.7 ± 0.3 keV (1968SP01), 1633.6 ± 0.3 keV (1972OP01), and 1633.602 ± 0.015 keV (1981WA06).

c) Based on T1/2 = 11.00 ± 0.02 sec (1975AL27).

d) Eγ(4.97 → 1.63) = 3334.3 ± 0.7 keV; 3334.6 ± 0.7 keV (recoil corrected) (1969GA05), and = 3332.54 ± 0.19 keV (1981AL13).

e) log f0t value.

f) D.E. Alburger and E.K. Warburton, private communiation to Fay Ajzenberg-Selove (1987AJ02).

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²⁰N(β^-)²⁰O Evaluated Data

²⁰O(β^-)²⁰F Evaluated Data

²⁰Na(β⁺)²⁰Ne Evaluated Data

²⁰Mg(β⁺)²⁰Na Evaluated Data

A = 20 Beta-Decays Diagram

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Last modified: 29 October 2020