β--Decay Evaluated Data

1959EL41: 16N; measured T1/2.
1962MA38: 16N; measured not abstracted; deduced nuclear properties.
1964BI02: 16N; measured not abstracted; deduced nuclear properties.
1965GR21: 16N; measured T1/2.
1966SC05: 16N; measured T1/2.
1969HA42: 16N; measured Eα, Iα; deduced Iβ, log ft. 16O levels deduced α-width.
1970AL21: 16N; measured T1/2.
1970JO25: 16N; measured β-delayed α-spectrum. 16O level deduced no parity-forbidden α-decay.
1974NE10: 16N; measured Eα, Iα, Iγ; deduced β-branching. 16O level deduced α-width, parity non-conserving α-decay.
1982GA05, 1982GAZO: 16N; measured Eβ, Eγ, Iγ, β-decay rate; deduced pseudoscalar, axial vector coupling constant ratio, pion exchange current evidence.
1982GAZP: 16N(β-); measured β decay rate, branching ratio; deduced induced pseudoscalar coupling constants, meson exchange currents.
1983GA18: 16N(β-); measured Eγ, Iγ, Eβ, Iβ, β-decay rate vs t; deduced (gp/g(A)). 16N level deduced β-decay probability. 16O levels deduced Iβ.
1983MI20: 16N(β-); measured β-, γ-time spectra, relative γ yield; deduced β-decay rate Wβ, Wβ/Wμ, g(p)/g(A).
1984HA56: 16N(β-); measured β-spectra. 16O level deduced branching ratio (λβ/λγ).
1985HA22: 16N(β-); measured Eβ, Iβ, Eγ, Iγ; deduced g(p)/g(A), β-decay rate.
1985HE08: 16N(β-); measured βγ-coin. 16N level deduced β-decay rate. 16O levels deduced β-decay branching ratio.
1986JI02: 16N(β-); measured Eγ, Iγ; deduced response function.
1987OZZZ: 16mN(β-); measured T1/2, γ(t).
1988CH30: 16N(β-); measured β-spectrum.
1990FUZR: 16N(β-); measured Eβ, Iβ, Eγ, Iβ; deduced β/γ ratio for 0- level decay in 16N.
1991TAZS: 16N(β-), (α); measured Eβ, Iβ.
1992BUZY: 16N(β-); measured β-delayed Eα, Iα, α12C-coin; deduced implications to astrophysically relevant 12C(α, γ) reaction.
1993BU03, 1993BU18, 1993BU21: 16N(β-); measured β-delayed Eα, Iα, α(12C)-coin; deduced E1 part of 12C(α, γ) reaction, astrophysical S-factor.
1993ZH06: 16N(β-); measured β-delayed Eα, Iα; deduced p-wave astrophysical S-factor for 12C(α, γ) reaction, astrophysical implications.
1993ZH13: 16N(β-); measured β-delayed Eα, Iα, Eγ, Iγ; deduced 12C(α, γ) reaction, massive stars helium burning process implications. 16O level deduced β-decay branching ratio.
1994AZ03, 1995AZZY: 16N(β-); measured β-delayed α-spectrum, (α)(12C)-coin; deduced R-matrix, K-matrix level parameters relevant to 12C(α, γ) reaction.
1994MIZU: 16N(β-); measured Eβ, γ(t). 16N deduced levels, Eβ, β-ray branchings, T1/2.
1995BA50: 16N(β-); analyzed β-delayed α-decay data; deduced improved E1 α-capture σ for 12C.
1995FUZZ: 16N(β-); measured Eβ, Iβ(t), γ time spectra, T1/2, β decay rate of 16N(0-) state. 16O levels deduced β-branching.
1995ITZY: 16N(β-); measured decay products, Eγ, Iγ; deduced average T1/2.
1996DR09: 16N(β-); measured average T1/2.
1997BE40: 16N(β-); measured βγ-coin, T1/2.
1997FR12: 16N(β-); measured β-delayed α spectra.
1997HU16: 16N(β-); measured Eγ, Iγ.
1998GA20: 16N(β-); measured β-delayed α spectra. Comparison with previous data, calculations.
1999KIZV: 16N(β-); measured Iβ, Iγ; deduced β-decay branching ratio.
1999MIZX, 2000MIZR, 2001MA42, 2001MB06: 16N(β-); measured β-NMR asymmetry; deduced μ, quadrupole moment.
2001BL01: 16N(β-); measured Eβ.
2002DR03: 16N(β-); measured Eγ, Iγ.
2002MAZW: 16N(β-); measured Eβ, β-NMR and β-NQR spectra from oriented nuclei. 16N deduced μ, quadrupole moment.
2004TAZW, 2005TAZR: 16N(β-); measured β-delayed Eα, (12C)α-coin.
2007FR11: 16N(β-); measured delayed α spectrum
2007RE17: 16N(β-); measured Eα, Iα, (particle)α-coin; deduced astrophysical S-factor.
2007TA34: 16N(β-), (β-α); measured Eα, Iα, 12Cα-coin. 12C(α, γ); deduced astrophysical S-factor.
2009BU12: 16N(β-), (β-α); analyzed β-delayed α-spectra from previous experiments at Yale, Triumf, Argonne, Seattle and Mainz using GEANT4 simulations and R-matrix analysis; deduced E1 fraction of the ground-statetransition in 12C(α, γ)16O reaction of astrophysical importance.
2010TA05: 16N(β-α); measured Eα, Iα, α12C-coin, half-life.
2013UE01: 16N(β-); measured Eγ, Iγ, Eβ, Iβ, E(n) by TOF, I(n), β-NMR, βγ-, βγγ-, βnγ-coin.
2015CHZZ: 16N(β-α); measured T1/2, branching ratios; deduced SE1.
2015YAZV: 16N(β-); measured β-delayed α-decay (via 9.585 MeV excited state in 16O) at CRIB; deduced order of magnitude for β-decay branching ratio.
2016RE01: 16N(β-α); measured decay products, Eα, Iα, Eβ, Iβ; deduced βα branching ratio and its uncertainties, impact on S-factor. Comparison with available data.
2018KI12: 16N(β-α); measured decay products, Eβ, Iβ, Eα, Iα, Eγ, Iγ; deduced he first accurate normalization of the β-delayed α spectrum of 16N and resolved a discrepancy between two previous high-precision measurements of the spectral shape, branching ratio, constrain on E1 capture σ.
2021AN03: 16N(β-), (β-α); analyzed available data; deduced fitting parameters, β delayed α emission from 16N as a function of the α energy.
Measured half-life for 16N(β-)16O

Recommended value (August, 2015): 7.13 ± 0.02 sec
Summary Table of Uncertainty Analysis:  Table 16N preview (PDF)  
Measured values: 7.09 ± 0.08 sec (1996DR09)
7.10 ± 0.05 sec (1996DR09)
7.13 ± 0.03 sec (1995ITZY)
7.13 ± 0.04 sec (1970AL21)
7.10 ± 0.03 sec (1966SC05)
7.16 ± 0.04 sec (1965GR21)
7.14 ± 0.02 sec (1964BI02)
7.31 ± 0.04 sec (1962MA38) (Excluded)
7.352 ± 0.009 sec (1959EL41) (Excluded)
7.38 ± 0.05 sec (1954MA1B) (Excluded)
7.35 ± 0.05 sec (1947BL1A) (Excluded)

Previous Measurements


Decay to
16O* (MeV)
Jπ Branching Ratio (%) log f0t Eβ(max) (MeV)
A B C (1961KA06) (1968WA18) (1969HA42) (1984WA07) (1985HE08) A B C (1968WA18) (1984WA07) (1971TO08) (1957MO1A) (1958BR95)
0 0+ 26 ± 2   24 ± 2 28       27.9 ± 0.5 a  28.1 ± 0.64 b 6.7   8.2 c 6.67 d 9.11 ± 0.04 c, e 9.069 ± 0.005 c 9.10 ± 0.04 c 10.33 ± 0.08     10.40 ± 0.05
6.05 0+ ≤ 0.015       (1.2 ± 0.4) x 10-2       ≥ 8.2         9.97 ± 0.15 c     9.96 ± 0.15 c Eγ(16O* → 16O(0)) (keV)
6.13 3- 68 ± 2   55 ± 4 54       66.2 ± 0.6 f     4.5 4.5 4.6       4.48 ± 0.04   4.47 g (1951MI1B)   6133 ± 11
(1975SH18) 6129.170 ± 0.043
(1982SH23) 6129.142 ± 0.032
(1986KE15) 6129.119 ± 0.04  
7.12 1- 4.9 ± 0.4 21 ± 4 18       4.8 ± 0.4     5.1 4.4 4.6       5.11 ± 0.04   5.09 g (1951MI1B)   7100 ± 20
(1976AL16) 7115.15 ± 0.14
8.87 2- 1.0 ± 0.2           1.06 ± 0.07 h   4.4       4.41 ± 0.03 h 4.37 g  
9.59 1-       (1.20 ± 0.05) x 10-3                 6.12 ± 0.05   6.21 g
9.84 2+           (6.5 ± 2.0) x 10-7             9.07 ± 0.13 c  
A: (1956WI1A, 1958AL13, 1959AL06).
B: (1957MO1A).
C: (1958BR95)
a We adopt 28.0 ± 0.5, the average of (1984WA07, 1985HE08): see (1993TI07).
b "Best" value is (28.0 ± 0.4)%.
c log f1t value.
d log f1t = 8.0.
e E.K. Warburton, private communication to Fay Ajzenberg-Selovelog (1971AJ02).
f Recalculated so that the sum of the branches = 100%.
g B. Zimmerman, private communication to Fay Ajzenberg-Selovelog (1971AJ02).
h E.K. Warburton, private communication to Fay Ajzenberg-Selovelog (1986AJ04).

16C(β-)16N Evaluated Data

A = 16 Beta-Decays Diagram

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Last modified: 23 June 2021