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.
- 2001WA53: 20Na(β+α); measurement.
- 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.
- 2018WA34: 20Na(β+α); measured decay products, Eα, Iα, Eγ, Iγ; deduced γ-ray energies and intensities, exotic β-γ-α decay mode.
- 2020BA07: compiled β+-delayed proton (or α) emission for very neutron-deficient nuclei, J, π, T1/2, branching ratios.
- 2021WA06: 20Na(EC), (β+), (β+α); measured decay products, Eβ+, Eγ, Iγ, Eα, Iα, γγ- and αγ-coin. 20Ne; deduced levels, J, π, isospin, EC and β+ feedings, log ft, B(F), B(GT). 16O; deduced levels, J, π, β+-delayed α sequences.
-
Measured half-life for 20Na(β+)20Ne
-
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: 24 June 2021
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