15C

β--Decay Evaluated Data

Measurements
1950HU72: 15C; measured T1/2.
1956DO37: 15C; measured T1/2.
1964NE09: 15C; measured not abstracted; deduced nuclear properties.
1969GA05: 15C; measured Iγ; deduced log ft, β-branching. 15N deduced levels.
1970AL21: 15C; measured T1/2.
1979AL23: 15C; measured γ, Iγ, T1/2; deduced log ft. 15N deduced levels, β-branching ratios.
1985ASZZ, 1986ASZX, 1987ASZX: 15C(β-); measured β-asymmetry, β-spectra, NMR; deduced spin polarization, μ.
1986ASZY, 1988ASZY: 15C(β-); measured β-asymmetry; deduced g.
1986RO11: 15C(β-); measured T1/2.
2001OGZZ: 15C(β-); measured β-NMR spectra from orinted nuclei; deduced μ.
2002AS06: 15C; measured β-NMR spectra; deduced μ.
2013UE01: 15C(β-); measured Eγ, Iγ, Eβ, Iβ, E(n) by TOF, I(n), β-NMR, βγ-, βγγ-, βnγ-coin. 15N; deduced levels.
Measured half-life for 15C(β-)15N

Recommended value (September, 2019): 2.450 ± 0.005 sec
Summary Table of Uncertainty Analysis:  Table 15C preview (PDF) Graph of Life-Time: Graph 15C preview (PDF)
Measured values: 2.42 ± 0.16 sec (1986RO11)
2.449 ± 0.005 sec (1979AL23: see also 2.449 ± 0.004 sec [D.E. Alburger, private communication to Fay Ajzenberg-Selove (1976AJ04)])
2.46 ± 0.01 sec (1970AL21)
2.49 ± 0.07 sec (1964NE09)
2.25 ± 0.05 sec (1956DO37)
2.4 ± 0.3 sec (1950HU72, HU50A, E.L. Hudspeth, et al., Phys. Rev. 85 (1952) 742, D13, and 1954SP1B)
Previous Measurements

 
Decay to
15N* (keV)		 Jπ Eβ-(max) (MeV) Branching Ratio (%) Log ft
(1956DO37) (1959AL06) a (1979AL23) (1984WA07) (1954RI1B) (1959AL06) b c (1979AL23)
0 1/2- 9.5 ± 0.3 9.82 ± 0.04 32 ± 2 32 ± 2 36.8 ± 0.8 5.6 6.0 5.96 ± 0.03  5.8 d 5.99 ± 0.03
5298.87 ± 0.15 e, f 1/2+ 4.5 ± 0.2 4.51 ± 0.03 68 ± 2 68 ± 2 63.2 ± 0.8 3.6 4.1 4.04 ± 0.02 4.80 4.08 ± 0.01
6323.3 ± 0.6      3/2-                    ≤ 0.4 x 10-2           ≥ 7.8
7301.1 ± 0.5      3/2+     (0.8 ± 0.2) x 10-2 (0.74 ± 0.08) x 10-2       6.82 ± 0.13 6.49 6.89 ± 0.05
8312.9 ± 0.5 g   1/2+     (5.0 ± 0.6) x 10-2     (4.1 ± 0.5) x 10-2       5.06 ± 0.06 4.51 5.18 ± 0.05
8571.4 ± 1.0      3/2+             ≤ 2.8 x 10-2     (1.3 ± 0.2) x 10-2       ≥ 5.0   5.34 ± 0.07
9050.0 ± 0.7 h   1/2+     (3.5 ± 0.5) x 10-2     (3.4 ± 0.3) x 10-2       3.99 ± 0.07   4.05 ± 0.04
a) (1959AL06, 1966AL12, 1969GA05).
b) Using T1/2 = 2.25 ± 0.05 sec.
c) Theoretical values; see (1959AL97).
d) See also (1972TO03).
e) (1976AL16). 5297.794 ± 0.035 keV: see (1981WA06).
f) Eγ(5.2989 → 0) = 5299.03 ± 0.43 keV (1967CH19); 5299 ± 6 keV (1959AL06).
g) Eγ(8.313 → 0) = 8315 ± 6 keV (1966AL12).
h) Eγ(9.050 → 0) = 9048 ± 4 keV (1966AL12).
15B(β-)15C Evaluated Data

15O(β+)15N Evaluated Data

A = 15 Beta-Decays Diagram

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Last modified: 29 June 2021