20F

β--Decay Evaluated Data



Measurements
1954WO23: 20F; measured T1/2.
1959VA10: 20F; measured T1/2.
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 T1/2, Eγ.
1967YU01: 20F; measured T1/2.
1969GA05: 20F; measured Iγ; deduced log ft, β-branching. 20Ne deduced levels.
1970WI05: 20F; measured T1/2; deduced log ft.
1975AL27: 20F; measured T1/2; deduced β-decay mirror asymmetry. 20F deduced log ft.
1976GE08: 20F; measured T1/2, β-spectrum; deduced shape factor, ft, Eβ, Q.
1980HE08: 20F; measured β-decay asymmetry.
1981AL13: 20F; measured Eγ, Iγ; deduced log ft, Iβ. 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 Iγ(t). 20F level deduced T1/2.
1993MA72: 20F(β-); compiled, reviewed T1/2 data.
1995ITZY: 20F(β-); measured decay products, Eγ, Iγ; deduced T1/2.
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 Iβ(θ, H, t) from polarized source.
2007WI09: 20F(β-); measured Eβ, Eγ, Eα. Deduced first forbidden decay branching ratios.
2009LI51: 20F(β-); measured Eγ.
2011MI18: 20F(β-); measured Eβ, β(θ), βγ(θ) from nuclear spin-polarized nuclei using β-NMR technique; deduced G-parity-violating, second-class current (SCC) induced tensor term.
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: Table 20F preview (PDF); Summary chart of all values:   Table 20F preview (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).

20C(β-)20N Evaluated Data

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: 18 February 2019