18Ne

β+-Decay Evaluated Data

Measurements
1954GO17: 18Ne.
1961BU05: 18Ne; measured not abstracted; deduced nuclear properties.
1961EC02: 18Ne; measured not abstracted; deduced nuclear properties.
1963FR10: 18Ne; measured not abstracted; deduced nuclear properties.
1965FR09: 18Ne; measured not abstracted; deduced nuclear properties.
1968GO05: 18Ne; measured Eγ, Iγ; deduced Iβ, log ft. 18F deduced levels, branching ratios.
1970AL11: 18Ne; measured T1/2; deduced log ft, β-branching.
1970AS06, 1970ASZV: 18Ne; measured Iγ, T1/2; deduced Iβ, log ft.
1972HA58: 18Ne; measured T1/2; deduced log ft, branching ratios.
1975AL27: 18Ne; measured T1/2; deduced β-decay mirror asymmetry.
1975HA21: 18Ne; measured Iγ, Eγ, T1/2; deduced ft values.
1981AD01: 18Ne; measured β-delayed Eγ, Iγ; 18F levels deduced β-branching, strength of parity-nonconserving effects.
1981BOZY: 18Ne; measured β-delayed Eγ, Iγ; deduced weak coupling constant. 18F deduced parity violation limit.
1982DAZZ: 18Ne; measured Eγ, Iγ following β-decay; deduced log ft, weak pion coupling constant. 18F levels deduced Iβ.
1982HE04, 1982HEZW: 18Ne; measured Eγ, Iγ following β-decay; deduced ft, parity nonconserving force parameter. 18F levels deduced absolute Iβ.
1982VOZY, 1983AD03: 18Ne(β+); measured Eγ, Iγ; deduced ft. 18F levels deduced β-branching ratios, relative Iγ, parity mixing effects.
1997EG02: 18Ne(β+); measured βγ-coin, βγ(θ), Iγ(θ); deduced Doppler shift, parameter C(s)/C(v).
1998BR23: 18Ne(β+); measured βγ-coin, βγ(θ); deduced β-ν angular correlation.
2001BE67: 18Ne(β+); measured γγ-coin; deduced T1/2 limit for decay of water molecules to 18Ne resonance.
2002TO19, 2005HA15, 2005HA27, 2005HA65, 2006HA12: 18Ne; compiled, analyzed superallowed β-decay decay Q(EC), T1/2, ft, branching ratios; deduced limits on weak-interaction parameters.
2002VO11: 18Ne(β+); measured Eγ, βγ-coin; deduced β-ν angular correlation.
2007GR18: 18Ne(β+); measured β-delayed γ-decays, T1/2.
2008SVZX: 18Ne; measured Eγ, Iγ, Iβ(t), βγ-coin, γγ-coin; deduced T1/2.
2009BAZT: 18Ne(β+); measured Eβ, Iβ, Eγ, Iγ, β-γ-coin.; deduced J, π, transition strengths.
2009HA12: 18Ne(β+); analyzed Q values, half-lives and branching ratios; deduced statistical rate function (Ft).
2013GR03: 18Ne(β+); measured Eγ, Iγ, Eβ, βγ-coin, T1/2; deduced β branching ratios. Comparison with previous experimental results for half-life. Superallowed β decay.
2015HA07: 18Ne(β+), (EC); compiled and evaluated Q(ε), T1/2, branching ratios, γ-intensity ratios for superallowed (0+ to 0+) β transitions in Tz = -1 and 0 parent nuclei; deduced partial half-lives, ft, Ft.
2015LA19: 18Ne(β+), (EC); measured β, Eγ, Iγ, βγ-coin, half-lives of 18Ne.
2020HA30: 18Ne(β+), (EC); compiled and evaluated Q(ε), T1/2, β decay branching ratios, γ-intensity ratios for superallowed (0+ to 0+) β decays in Tz = -1 and 0 parent nuclei; deduced partial half-lives, ft and Ft for superallowed Fermi decays.
Measured half-life for 18Ne(β+)18F

Summary Table of Uncertainty Analysis:      Table 18Ne preview (PDF) Summary Chart of All Values:      Table 18Ne preview (PDF)
Recommended value (August, 2024): 1.66427 ± 0.00072 sec
Measured values:      1.66400+0.00057-0.00048 sec (2015LA19)
1.6648 ± 0.0011 sec (2013GR03: includes reanalysis of data from 2007GR18)
1.669 ± 0.004 sec (1975AL27)
1.687 ± 0.009 sec (1975HA21: see preliminary result of 1.655 ± 25 in 1972HA58)
1.67 ± 0.02 sec (1970AL11)
1.69 ± 0.04 sec (1970AS06)
1.47 ± 0.10 sec (1963FR10, 1964FR1B, 1965FR09)
1.46 ± 0.07 sec (1961BU05)
1.73 ± 0.42 sec (1961EC02)
1.6 ± 0.2 sec (1954GO17)
1.25 ± 0.20 sec (1961Bu05 sited from 1959Du81) (Excluded)
Other Reviews: 1.66422 ± 0.00047 sec (2020HA30)
1.6654 ± 0.0011 sec (2015HA07)
1.6670 ± 0.0017 sec (2009HA12)
1.682 ± 0.015 sec (1975HA45)
Previous analysis (August 2015): 1.66428 ± 0.00060 sec Calculated using same data but assuming symmetrized uncertainty analysis
Previous Measurements

 
Decay to 18F*
(MeV)		 Jπ; T Eγ (keV) Ei → Ef
(keV)		 Branching Ratio
(%)		 log f0t Iγ c
a F K b K
0 1+; 0     E 92.5 ± 0.2   3.094 ± 0.005 3.088 ± 0.003 3.096 ± 0.004  
F d, K 92.11 ± 0.21  
1.04 e 0+; 1 A 1041 ± 5 1042 → 0       A 7 ± 2 3.456 ± 0.012 3.468 ± 0.013 3.473 ± 0.013 7.83 ± 0.21
B 1035 ± 5  
C   1030 ± 20 C 9 ± 3
D 1043 ± 1 E 7.3 ± 0.2
F 1041.3 ± 1.0   F d 7.66 ± 0.21
J 1041.5 ± 0.3 J 7.70 ± 0.21
K 1041.55 ± 0.08 K 7.70 ± 0.21
1.08 e 0-; 0   1081 → 0       D < 0.7 7.20 ± 0.11   7.012 ± 0.059 (2.26 ± 0.21) x 10-3
G 1080.5 ± 0.1   G f     (1.3 ± 0.3) x 10-3
  H (2.28 ± 0.17) x 10-3
J 1080.7 ± 0.5 J (2.14 ± 0.26) x 10-3
K 1080.76 ± 0.13 K (2.07 ± 0.28) x 10-3
1.70   1+; 0   1701 → 0       E 0.17 ± 0.05   4.43 ± 0.06 g 4.38 ± 0.05 4.477 ± 0.015 0.0538 ± 0.0018
F 1699.6 ± 2.0   F d 0.23 ± 0.03
    G f 0.19 ± 0.04
J 1699.9 ± 0.3 J 0.183 ± 0.006
K 1700.81 ± 0.18 K 0.188 ± 0.006
F   659.4 ± 1.0 1701 → 1042           0.135 ± 0.005
J   659.0 ± 0.3
K   659.26 ± 0.20
2.10   2-; 0     D < 1.5  
A: (1961BU05)
B: (1961EC02)
C: (1963FR10, 1964FR1B, 1965FR09)
D: (1968GO05)
E: (1970AS06)
F: (1975HA21)
G: (1981AD01)
H: (1982DAZZ)
J: (1982HE04)
K: (1983AD03)
a) Based on Qm and T1/2 = 1.672 ± 0.004 sec.
b) Based on T1/2 = 1.672 ± 0.008 sec.
c) γ-ray intensities are per 100 parent decays.
d) Adopted value.
e) The splitting of the 0+ and 0- states is 39.20 ± 0.11 keV (1983AD03).
f) and E.G. Adelberger, private communication to Fay Ajzenberg-Selove, (1983AJ01).
g) Calculated assuming branch = 0.21 ± 0.03 %.
18C(β-)18N Evaluated Data

18N(β-)18O Evaluated Data

18F(β+)18O Evaluated Data

A = 18 Beta-Decays Diagram

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Last modified: 22 August 2024