β+-Decay Evaluated Data

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 T1/2.
1972LE33: 19Ne; measured K/β+ ratios.
1974MA31: 19Ne; measured Eγ, Iγ; deduced upper limit for Iβ.
1974WI14: 19Ne; measured T1/2; deduced ft values, GT matrix elements.
1975AZ01: 19Ne; measured T1/2. 19Ne; calculated log ft.
1975FR15: 19Ne; measured β decay branching ratio to 1554-keV level.
1975MAXA: 19Ne(EC), (β+); measured Eγ, decay branches; deduced log ft.
1976AL07: 19Ne; measured Iγ; deduced β-branching, log ft.
1981AD05: 19Ne; measured γγγ-coin; deduced Iβ, log ft. 19F deduced parity mixing effect smaller than shell model predictions.
1983AD03: 19Ne(β+); measured Eγ, Iγ; deduced ft. 19F levels deduced β-branching ratios, relative Iγ, 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 T1/2.
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 T1/2.
2012TR06, 2012TR09: 19Ne(EC); measured decay products, Eγ, Iγ; deduced T1/2, isospin branch information.
2012UJ01: 19Ne(EC), (β+); measured decay products; deduced T1/2 in different environments and temperatures.
2013UJ01: 19Ne(EC), (β+); measured decay products; deduced T1/2, branching ratios and uncertainties, lack of electron screening effects.
2014BR06: 19Ne(EC), measured decay products, Eγ, Iγ; deduced T1/2.
2017FO24: 19Ne(EC), (β+), measured Eβ, Iβ, precise half-life of the decay of 19Ne.
2018FA02: 19Ne(β+), measured decay products, time of flight, Eβ, Iβ; deduced ion charge-state branching ratios.
2019RE07: 19Ne(β+), measured Eγ, Iγ, electron spectra, βγ-coin; 19F; deduced levels, β+-branching ratios, precise β branch for superallowed ground-state to ground-state branch, ft values, Vud element of the CKM quark-mixing matrix. Comparison with previous experimental results.
Measured half-life for 19Ne(β+)19F

Recommended value (January, 2018): 17.258 ± 0.008 sec: Weighted average (external errors) with uncertainties doubled
Summary Table of Uncertainty Analysis:   Table 19Ne preview (PDF); Summary Chart of All Values: Table 19Ne preview (PDF)  
Measured values: 17.2569 ± 0.0021 sec (2017FO24)
17.2832 ± 0.0083 sec (2014BR06: Included, but appears to carry systematic errors)
17.254 ± 0.005 sec (2013UJ01)
17.262 ± 0.007 sec (2012TR06) (Note: preliminary report in (2012TR09))
18.5 ± 0.6 sec (1992GE08, 1997KL06) (Excluded due to 11% 15O contaminant)
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)
16.5 ± 1.0 sec (1964VA23) (Excluded)
17.43 ± 0.06 sec (1962EA02)
16.72 ± 0.05 sec (1960JA12) (Excluded)
19.5 ± 1.0 sec (1960WA04, 1958WE25) (Excluded)
17.4 ± 0.2 sec (1959HE1E)
18.3 ± 0.5 sec (1957AL29) (Excluded)
17.7 ± 0.1 sec (1957PE12) (Excluded)
19 ± 1 sec (1954NA29) (Excluded)
18.5 ± 0.5 sec (1952SC15) (Excluded)
20.3 ± 0.5 sec (1939WH02) (Excluded)
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 Measurements


Decay to 19F*
Jπ Branching Ratio (%) log ft Eβ(max) (MeV) εK+
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).

19B(β-)19C Evaluated Data

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: 29 October 2020