1939WH02: ¹⁹Ne.

1952SC15: ¹⁹Ne.

1954JO21: ¹⁹Ne.

1954NA29: ¹⁹Ne.

1957AL29: ¹⁹Ne.

1957PE12: ¹⁹Ne.

1958WE25: ¹⁹Ne.

1960JA12: ¹⁹Ne; measured not abstracted; deduced nuclear properties.

1960WA04: ¹⁹Ne; measured not abstracted; deduced nuclear properties.

1962EA02: ¹⁹Ne; measured not abstracted; deduced nuclear properties.

1964VA23: ¹⁹Ne; measured not abstracted; deduced nuclear properties.

1968GO10: ¹⁹Ne; measured T_1/2.

1972LE33: ¹⁹Ne; measured K/β⁺ ratios.

1974MA31: ¹⁹Ne; measured E_γ, I_γ; deduced upper limit for I_β.

1974WI14: ¹⁹Ne; measured T_1/2; deduced ft values, GT matrix elements.

1975AZ01: ¹⁹Ne; measured T_1/2. ¹⁹Ne; calculated log ft.

1975FR15: ¹⁹Ne; measured β decay branching ratio to 1554-keV level.

1975MAXA: ¹⁹Ne(EC), (β⁺); measured E_γ, decay branches; deduced log ft.

1976AL07: ¹⁹Ne; measured I_γ; deduced β-branching, log ft.

1981AD05: ¹⁹Ne; measured γγγ-coin; deduced I_β, log ft. ¹⁹F deduced parity mixing effect smaller than shell model predictions.

1983AD03: ¹⁹Ne(β⁺); measured E_γ, I_γ; deduced ft. ¹⁹F levels deduced β-branching ratios, relative I_γ, parity mixing effects.

1983HAZD: ¹⁹Ne(β⁺), (EC); measured triple angular correlation; deduced correlation coefficient D.

1983MAZA: ¹⁹Ne(β⁺), (EC); measured NMR; deduced μ, electric dipole moment.

1983SC32, 1983SCZM: ¹⁹Ne(β⁺), (EC); measured β polarization, asymmetry, time reversal odd angular correlation magnitude R; deduced time reversal invariance.

1983SCZQ: ¹⁹Ne(β⁺), (EC); measured β-decay triple correlation amplitude R; deduced consistency with time reversal invariance.

1984HA01: ¹⁹Ne(β⁺), (EC); measured β⁺(recoil ion)-coin; deduced asymmetry parameter, time reversal symmetry validity.

1985BR29: ¹⁹Ne; analyzed Gamow-Teller decay data. Shell model, effective one-body operator, densities.

1985PIZY: ¹⁹Ne(β⁺), (EC); measured β-spectrum.

1987SEZL, 1987SEZR, 1988SE11: ¹⁹Ne(β⁺), (EC); measured β-anisotropy.

1992GE08: ¹⁹Ne(β⁺), (EC); measured in-flight β⁺-decay pattern; deduced T_1/2.

1993SA32: ¹⁹Ne(β⁺); measured (βγ)-coin, β-asymmetry, oriented nuclei, branching ratio. ¹⁹Ne levels deduced (Γ/Γ(W)). ¹⁹F level deduced isovector parity mixing matrix element.

1995GO34: ¹⁹Ne; compiled, reviewed β-decay asymmetry data; deduced polarization-asymmetry correlation senstivity to charged currents of right-handed chirality.

1997KL06: ¹⁹Ne(β⁺); reviewed, analyzed fully ionized sources T_1/2.

2012TR06, 2012TR09: ¹⁹Ne(EC); measured decay products, E_γ, I_γ; deduced T_1/2, isospin branch information.

2012UJ01: ¹⁹Ne(EC), (β⁺); measured decay products; deduced T_1/2 in different environments and temperatures.

2013UJ01: ¹⁹Ne(EC), (β⁺); measured decay products; deduced T_1/2, branching ratios and uncertainties, lack of electron screening effects.

2014BR06: ¹⁹Ne(EC), measured decay products, E_γ, I_γ; deduced T_1/2.

2017FO24: ¹⁹Ne(EC), (β⁺), measured E_β, I_β, precise half-life of the decay of ¹⁹Ne.

2018FA02: ¹⁹Ne(β⁺), measured decay products, time of flight, E_β, I_β; deduced ion charge-state branching ratios.

2019RE07: ¹⁹Ne(β⁺), measured E_γ, I_γ, electron spectra, βγ-coin; ¹⁹F; deduced levels, β⁺-branching ratios, precise β branch for superallowed ground-state to ground-state branch, ft values, V_ud element of the CKM quark-mixing matrix. Comparison with previous experimental results.

Measured half-life for ¹⁹Ne(β⁺)¹⁹F

Recommended value (July 2025):	17.2562 ± 0.0029 (stat.) ± 0.0009 (sys.) sec:	Weighted average (external errors) with uncertainties doubled
Summary Table of Uncertainty Analysis:	(PDF);	Summary Chart of All Values: (PDF)
Measured values:	17.2569 ± 0.0021 sec	(2017FO24)
	17.254 ± 0.005 sec	(2013UJ01)
	17.237 ± 0.014 sec	(1984PIXX: Unpublished; L.E. Piilonen, Ph.D. thesis, Princeton University, 1984 (Pro Quest))
	17.219 ± 0.017 sec	(1975AZ01)
	17.36 ± 0.06 sec	(1974WI14)
	17.36 ± 0.06 sec	(1968GO10)
	17.43 ± 0.06 sec	(1962EA02)
	17.4 ± 0.2 sec	(1959AL10)
	17.4 ± 0.2 sec	(1959HE41)
Excluded values:	17.2832 ± 0.0083 sec	(2014BR06: Appears to carry systematic errors)
	17.262 ± 0.007 (sys.) sec	(2012TR06) (Note: preliminary report in (2012TR09))
	18.5 ± 0.6 sec	(1992GE08, 1997KL06) (Excluded due to 11% 15O contaminant)
	16.5 ± 1.0 sec	(1964VA23)
	16.72 ± 0.05 sec	(1960JA12)
	19.5 ± 1.0 sec	(1960WA04, 1958WE25)
	17.7 ± 0.1 sec	(1957PE12)
	18.3 ± 0.5 sec	(1957AL29)
	19 ± 1 sec	(1954NA29)
	18.5 ± 0.5 sec	(1952SC15)
	18.6 ± 0.4 sec	(1951BL75)
	18.2 ± 0.6 sec	(1949SH25)
	20.3 ± 0.5 sec	(1939WH02)
	20 sec	(1939FO01)
Other Reviews:	17.248 ± 0.029 sec	(2008SE10)
	17.34 ± 0.09 sec	(1983AD03)
	17.260 ± 0.014 sec	(Our analysis in September, 2015)
Previous analysis:	17.258 ± 0.008 sec	(Previous analysis)

Previous Measurements

 

Decay to 19F* (MeV)	Jπ	Branching Ratio (%)			log ft				Eβ(max) (MeV)			εK/β+
		a	(1976AL07)	(1983AD03) b	(1976AL07)	(1981AD05)	(1983AD03) c	(1954JO21) d	(1952SC15)	(1957AL29)	(1958WE25)	(1972LE33)
0	1/2+			99.99	3.237 ± 0.001		3.237 ± 0.002	3.23	2.18 ± 0.03	2.23 ± 0.05	2.24 ± 0.01	(9.6 ± 0.3) x 10-4
0.11	1/2-			(1.2 ± 0.2) x 10-2		7.05 ± 0.08	7.061 ± 0.072
1.554 e	3/2+	< 3 x 10-3 f	(2.1 ± 0.3) x 10-3	(2.22 ± 0.21) x 10-3 g	5.72 ± 0.06		5.700 ± 0.041

a) (1974MA31, 1975MAXA).

b) See also (1981AD05).

c) See also (1985BR29).

d) and B.A. Zimmerman, private communication to Fay Ajzenberg-Selove (1972AJ02).

e) Eγ for 19F*(1.55 → 0.20) = 1356.92 ± 0.15 keV (1976AL07), 1356.84 ± 0.13 keV (1983AD03).

f) (1975FR15) measured (8.2 ± 2.0) x 10-4.

g) From (1976AL07, 1983AD03).

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¹⁹C(β^-)¹⁹N Evaluated Data

¹⁹N(β^-)¹⁹O Evaluated Data

¹⁹O(β^-)¹⁹F Evaluated Data

A = 19 Beta-Decays Diagram

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Last modified: 14 July 2025