20Na

β+-Decay Evaluated Data



Measurements
1951SH38: 20Na; measured T1/2.
1953HO01: 20Na; measured T1/2.
1964MA44, 1969MAZT: 20Na; measured T1/2, α-spectrum; deduced β-branching. 20Ne deduced levels α-width.
1967SU05: 20Na; measured T1/2; deduced nuclear properties.
1970OA01: 20Na; measured T1/2, βα-coin, βα(θ).
1971GO18: 20Na; measured T1/2; deduced mass excess.
1971MA09: 20Na; measured β-delayed α-spectra; deduced βν anisotropy coefficients.
1971WI07: 20Na; measured T1/2; deduced ft ratios. 20Na deduced mass.
1972INZW, 1976IN06: 20Na; measured Eγ, Iγ; deduced ft, β-branching. 20Ne deduced levels, J, π, T.
1972MO08: 20Na; measured T1/2.
1972TO08: 20Na; measured βγ-coin, T1/2, Iα, Iγ; deduced log ft.
1973TO08: 20Na; measured Eα, Iα, βγ-coin, Eγ. Deduced β-branching, Qβ, log ft. 20Ne deduced levels, J, π.
1981HOZO: 20Na; measured β-delayed Ep, Ip, Eα, Iα; deduced log ft. 20Ne levels deduced, J, π, T, α-reduced widths.
1982CLZY: 20Na; measured β-delayed α-particle energy shifts, T1/2, Iβ; deduced log ft, vector to axial vector component ratios, vector weak coupling constant. 20Ne levels deduced isospin mixing with IAS.
1983CL01: 20Na(β+), (EC); measured βν(θ), βνα-coin; deduced β-delayed α-particle kinematic shifts, triple correlation coefficient; deduced superallowed β-decay vector weak coupling constant.
1986HO35: 20Na(β+); compiled T1/2, Q(EC), p-, α-binding energies, β-delayed Ip, Iα, Gamow-Teller transition strength distributions.
1988RO10: 20Na(β+); measured βγ(θ); deduced pseudotensor form factors.
1989CL02: 20Na; measured β+ rays, β-delayed Eα, Iα, Eγ, Iγ, T1/2, I(Eγ), (βα)-coin; deduced ft values, βνα-triple correlation coefficients, vector weak coupling constants. 20Ne deduced branching ratios, Gamow-Teller matrix elements, levels, isospin mixing amplitudes.
1992KU24, 1992KUZO, 1992KUZQ: 20Na(β+p), (α); measured β-delayed particle spectra. 20Na deduced 1+ state may not be s-wave resonance.
1993BL10: 20Na(β+); measured α-branching ratios.
1994PA42: 20Na(β+); measured β-delayed Eα, Iα; deduced stellar reaction rate implications. 20Na level deduced J, resonance strength.
1995HU13: 20Na(β+); measured β-delayed α-spectra. 20Na level deduced γ-decay, resonance strength features.
2002REZU, 2003SCZX, 2003WI11, 2003WI16: 20Na(β+α); measured β-delayed Eα, Iα, βα-coin; deduced neutrino spectrum.
2004MI51: 20Na(β+), (EC); measured Iβ(θ, H, t) from polarized source.
2004RE07: 20Na(β+), (EC); measured β-delayed Eα; deduced neutrino spectrum.
2004WI13, 2004WIZZ: 20Na(EC); measured β-delayed Eα.
2007NAZT: 20Na(β+); measured Iβ(θ, H, t) from polarized source.
2009HY02: 20Na(β+); measured Eα, Iα, Eγ, Iγ, Eβ, βγ-, βα-, ααα-coin. 20Ne; deduced levels, β feedings, and log ft. Triple-α method and R-matrix analysis.
2009IC05: 20Na(β+); measured Eγ.
2011KI14: 20Na(β+); measured β-delayed α spectrum and used for calibration.
2011MI18: 20Na(β+); measured Eβ, β(θ), βγ(θ) from nuclear spin-polarized nuclei using β-NMR technique.
2013LA22: 20Na(β+α); measured β-delayed α decay Eα, Iα, (16O)α-coin; deduced low-lying α transitions, branching ratios; calculated levels energy, width using R-matrix.
2016SY01: 20Na(β+); measured Eβ, Iβ, Eγ, Iγ, polarization, dependence of half-life of 20Na nuclei on the nuclear spin direction.
Measured half-life for 20Na(β+)20Ne

Recommended value (September, 2015): 447.9 ± 2.3 ms (Weighted Average)
Summary Table of Uncertainty Analysis:     Table 20Na preview (PDF)  
Measured values: 451.8 ± 3.9 ms (1983CL01, 1989CL02)
448 ± 4 ms (1973TO08: see preliminary value 451 ± 2 ms in (1970OA01).)
446 ± 8 ms (1972MO08)
442 ± 5 ms (1971GO18, 1971WI07)
408 ± 6 ms (1967SU05) (Excluded)
  385 ± 10 ms (1953HO01) (Excluded)
  230 ± 80 ms (1951SH38) (Excluded)

Previous Measurements

 

Decay to 20Ne* (keV) a Jπ Branching Ratio (%) log ft
A (1973TO08) (1976IN06) b (1989CL02) A (1973TO08) (1976IN06) c (1989CL02) d
1633.674 ± 0.015 2+ 90.0       79.47 ± 1.57   79.18 ± 1.58 79.44 ± 0.27   4.93   4.988 ± 0.009 4.99
4966.51 ± 0.20 2- e     0.157 ± 0.022 > 6.1           6.97
5620 A    3- A e       > 6.5            
5790 A    1- A e       > 6.5            
  6706 ± 47         0.0032 ± 0.0007       8.15
7421.9 ± 1.2 2+ 8.1     16.37 ± 1.28     15.96 ± 0.22   4.48 4.19 ± 0.05   4.20
7833.4 ± 1.5 2+ 0.38   0.674 ± 0.055   0.583 ± 0.010 5.65 5.417 ± 0.033   5.48
8058 ± 8 (1-, 2+, 3-)       0.0119 ± 0.0009       7.08
      8740 ± 30 A    1- A 0.024       6.46      
    8820 ± 10 f     0.034 ± 0.007       6.27 ± 0.08    
  9196 ± 30 2+       0.0625 ± 0.0064       5.82
9483 ± 3 2+ 0.11   0.247 ± 0.020   0.241 ± 0.005 5.41 5.064 ± 0.034   5.08
9873 ± 4 3+     0.0272 ± 0.0138 0.028 ± 0.014     5.78 ± 0.18 5.77
10274 ± 3   2+ 1.38   2.89 ± 0.23 2.944 ± 0.224   2.877 ± 0.042 g 3.79 ± 0.05 h     3.471 ± 0.033 j 3.48
10578 ± 4   2+   0.087 ± 0.009   0.0883 ± 0.0027   4.76 ± 0.05   4.76
10840 ± 4   2+ 0.097 0.193 ± 0.016   0.174 ± 0.005 4.46 4.179 ± 0.035   4.23
10884 ± 3   3+     0.0392 ± 0.0139 0.117 ± 0.042     4.84 ± 0.13 4.36
10941 ± 9   2+       0.0119 ± 0.0015       5.30
11116 ± 9   2+       0.0087 ± 0.0011       5.26
11262.3 ± 1.9   1+     0.203 ± 0.026 0.205 ± 0.026     3.73 ± 0.05 3.72
11295 ± 5   2+ 0.032 0.036 ± 0.004   0.0263 ± 0.0017 4.50 4.41 ± 0.05   4.58
11856 ± 8   2+   0.0016 ± 0.0004   0.0016 ± 0.0004   4.98 ± 0.10   4.99
A: (1967PO11, 1967SU05). See also (1964MA44).
a) (1989CL02). See Table 3 of that work for references and details.
b) Electron capture + β+.
c) Includes radiative, nuclear size, lepton wavelength, electron screening and electron capture corrections.
d) Allowed decay assumed.
e) Not observed. See discussion in (1967SU05).
f) From (1973TO08).
g) = 2.868 ± 0.039 (1983CL01).
h) See (1971GO18).
j) = 3.476 ± 0.009 (1983CL01).

20C(β-)20N Evaluated Data

20N(β-)20O Evaluated Data

20O(β-)20F Evaluated Data

20F(β-)20Ne Evaluated Data

20Mg(β+)20Na Evaluated Data

A = 20 Beta-Decays Diagram

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Last modified: 21 May 2018