1978WI04: ¹⁴O; measured T_1/2; deduced ft values.

1981WH03: ¹⁴O(β⁺); deduced Q. ¹⁴O deduced Q_β, radiative corrected ft.

2003TO03: ¹⁴N(p, n); deduced threshold energies. ¹⁴O deduced Q(EC) for superallowed decay.

2003TO29: ¹⁴O(EC); compiled, analyzed superallowed decays Q-values, T_1/2, log ft, related data; deduced V_μd matrix element.

2004BA78: ¹⁴O(β⁺); measured E_γ, I_γ, T_1/2; deduced log ft.

2005HA08, 2005HA27, 2005HA65, 2005TO21: ¹⁴O; compiled, analyzed superallowed β-decay decay Q(EC), T_1/2, ft, branching ratios; deduced limits on weak-interaction parameters.

2005SA44: ¹⁴O; compiled, analyzed log ft.

1971CL07: ¹⁴O; measured T_1/2; deduced log ft.

1972SI50: ¹⁴O; measured T_1/2; deduced log ft, coupling constant.

1973CL12, 1973CLZM: ¹⁴O; measured T_1/2; deduced ft value.

1974HAYC: ¹⁴O; measured ft.

1980WI13: ¹⁴O; measured I_γ; ; deduced log ft.

1981HE19: ¹⁴O; measured E_γ, I_γ; deduced ft, Gamow-Teller transition strength.

1982HEZW: ¹⁴O(β⁺); measured E_γ, I_γ, &$946;-branching ratio. ¹⁴N deduced Gamow-Teller transition strength.

1982KO28: ¹⁴O; deduced superallowed β-decay Q(EC) difference, ft.

1982WA16: ¹⁴O(β⁺); measured E_γ; deduced β⁺-endpoint energy, ft.

1984KOZH: ¹⁴O; analyzed T_1/2, β-decay energies, branching ratios; deduced ft, related parameters.

1987KO34: ¹⁴O; deduced Q(EC) differences.

1988GI02: ¹⁴O(β⁺); measured β⁺ polarization.

1991CA12: ¹⁴O(β⁺); measured Fermi, Gamow-Teller decay relative polarization; deduced nonstandard weak currents limits.

1995GAZU: ¹⁴O(β⁺); measured T_1/2.

1998BA83: ¹⁴O(β⁺); analyzed data; deduced superallowed decays Q-values.

1998BR23: ¹⁴O(β⁺); measured βγ-coin, βγ(θ); deduced β-ν angular correlation.

2001BA06: ¹⁴O(β⁺); measured E_γ, I_γ. ¹⁴N deduced transition energies.

2001GA59: ¹⁴O(EC); measured E_γ, T_1/2.

2002BUZW, 2002BUZX: ¹⁴O(EC); measured T_1/2.

2002VO11: ¹⁴O(β⁺); measured E_γ, βγ-coin; deduced β-ν angular correlation.

2003VO01: ¹⁴O(β⁺); measured E_γ, βγ-coin, angular correlation; deduced beta-neutrino coupling coefficient.

2006BU12: ¹⁴O(β⁺); measured E_γ, _β, T_1/2; deduced log ft.

Measured half-life for ¹⁴O(β⁺)¹⁴N

Recommended value:	70.606 ± 0.018 s;	see (1978WI04)
Measured values:	70.696 ± 0.052 s	(2006BU12)
	70.641 ± 0.020 s	(2004BA78)
	70.613 ± 0.025 s	(1978WI04)
	70.599 ± 0.022 s	(1975HA45)
	70.43 ± 0.18 s	(1974AZ01)
	70.588 ± 0.028 s	(1973CL12, 1971CL07)
	70.48 ± 0.15 s	(1972AL01)
	70.32 ± 0.12 s	(1972SI50)
	71.3 ± 0.1 s	(1963FR10)
	71.00 ± 0.13 s	(1962BA26)
	70.91 ± 0.04 s	(1961HE03)
	72.1 ± 0.4 s	(1954GE38)

Previous Measurements

 

Decay to 14N* (MeV)	Jπ	Eβ+(max) (keV)		Branching Ratio (%)		ft (sec)
0	1+	(1954GE38, 1955SH84)	4145 ± 20	(1954GE38, 1955SH84)	0.60 ± 0.10	(1954GE38, 1955SH84)	(2.0 ± 0.3) x 107
		(1962BA26)	4124 ± 2	(1963FR10, 1965FR09)	0.65 ± 0.05	(1963FR10, 1965FR09)	(1.7 ± 0.2) x 107
		(1963FR10, 1965FR09)	4085 ± 30	(1965KAZX, 1966SI05)	0.61 ± 0.01	(1965KAZX, 1966SI05)	(2.14 ± 0.03) x 107
						(KA69C)	(1.9 ± 0.2) x 107
						(1980WI13)	7.266 ± 0.009 h
2.31	0+	(1954GE38, 1955SH84)	1835 ± 8	(1954GE38, 1955SH84)	99.4 ± 0.1	(1954GE38, 1955SH84)	3725 ± 75
		(PE54A)	1830 ± 30	(1963FR10, 1965FR09)	99.35 ± 0.05	(1957BR18)	3088 ± 56
		(1961BU04)	1809.7 ± 1.5	a	99.328 ± 0.012	(1961HE03)	3061 ± 10
		(1962BA26)	1812.6 ± 1.4 b	c	99.332 ± 0.011	(1961BU04)	3057 ± 20
		(1963FR10, 1965FR09)	1821 ± 7	d	99.336 ± 0.010	(1962BA26)	3074 ± 10 e
						(1963FR10, 1965FR09)	3137 ± 70
						(KA69C)	3076 ± 7
						(1975HA45)	3084.3 ± 3.6
						(1978WI04)	3086.5 ± 2.7
						(1981WH03)	3084.4 ± 1.1 f
3.95	1+			(1965KAZX, 1966SI05)	0.062 ± 0.007 g	(1965KAZX, 1966SI05)	1200 ± 150 g
				(1980WI13)	0.0577 ± 0.0043	(1980WI13)	3.112 ± 0.034 h
				(1981HE19)	0.0528 ± 0.0023	(1981HE19)	1446 ± 63

a) Obtained by adopting 0.61 ± 0.01 % (1966SI05) and 0.062 ± 0.007 % (KA69C) for the branching ratio to 14N*(0, 3.95) [both 1+; 0 states]. Sum of εK and β-decay in ratio 6/4 (R.W. Kavanagh, private communication to Fay Ajzenberg-Selove, (1981AJ01)

b) 1890.1 ± 1.5 keV is obtained from measurements of the threshold energy of the 14N(p, n)14O reaction and the energy of 14N*(2.31). This value leads to a 0.8% decrease in the ft value of (1962BA26) (1968FR08).

c) Obtained by adopting 0.61 ± 0.01 % (1966SI05) and 0.058 ± 0.004 % (WI80F) for the branching ratio to 14N*(0, 3.95) [both 1+; 0 states].

d) Obtained by adopting 0.61 ± 0.01 % (1966SI05) and 0.054 ± 0.002 % (weighted mean of (1980WI13 and 1981HE19) for the branching ratio to 14N*(0, 3.95) [both 1+; 0 states].

e) Using τ(partial) = [71.36 ± 0.009] sec; includes form-factor and screening corrections. Radiative corrections of (KI59C) increase ft to 3126 sec: see also (BA66A, 1966FR15, SU67A).

f) This is the fRt value.

g) And private communication: 0.025 β+ (KA69C).

h) This is the log ft value.

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¹⁴B(β^-)¹⁴C Evaluated Data

¹⁴C(β^-)¹⁴N Evaluated Data

A = 14 Beta-Decays Diagram

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Last modified: 17 November 2007