1968GO05: ¹⁸Ne; measured E_γ, I_γ; deduced I_β, log ft. ¹⁸F deduced levels, branching ratios.

1970AL11: ¹⁸Ne; measured T_1/2; deduced log ft, β-branching.

1970AS06, 1970ASZV: ¹⁸Ne; measured I_γ, T_1/2; deduced I_β, log ft.

1972HA58: ¹⁸Ne; measured T_1/2; deduced log ft, branching ratios.

1975AL27: ¹⁸Ne; measured T_1/2; deduced β-decay mirror asymmetry.

1975HA21: ¹⁸Ne; measured I_γ, E_γ, T_1/2; deduced ft values.

1981AD01: ¹⁸Ne; measured β-delayed E_γ, I_γ; ¹⁸F levels deduced β-branching, strength of parity-nonconserving effects.

1981BOZY: ¹⁸Ne; measured β-delayed E_γ, I_γ; deduced weak coupling constant. ¹⁸F deduced parity violation limit.

1982HE04, 1982HEZW: ¹⁸Ne; measured E_γ, I_γ following β-decay; deduced ft, parity nonconserving force parameter. ¹⁸F levels deduced absolute I_β.

1982VOZY, 1983AD03: ¹⁸Ne(β⁺); measured E_γ, I_γ; deduced ft. ¹⁸F levels deduced β-branching ratios, relative I_γ, parity mixing effects.

1997EG02: ¹⁸Ne(β⁺); measured βγ-coin, βγ(θ), I_γ(θ); deduced Doppler shift, parameter C(s)/C(v).

1998BR23: ¹⁸Ne(β⁺); measured βγ-coin, βγ(θ); deduced β-ν angular correlation.

2001BE67: ¹⁸Ne(β⁺); measured γγ-coin; deduced T_1/2 limit for decay of water molecules to ¹⁸Ne resonance.

2002TO19, 2005HA15, 2005HA27, 2005HA65, 2006HA12: ¹⁸Ne; compiled, analyzed superallowed β-decay decay Q(EC), T_1/2, ft, branching ratios; deduced limits on weak-interaction parameters.

2002VO11: ¹⁸Ne(β⁺); measured E_γ, βγ-coin; deduced β-ν angular correlation.

Measured half-life for ¹⁸Ne(β⁺)¹⁸F

Adopted value:	1.672 ± 0.008 sec;	the weighted mean of (1975AL27 and 1975HA21) and see (1983AD03)
Measured values:	1.669 ± 0.004 sec	(1975AL27)
	1.687 ± 0.009 sec	(1975HA21)
	1.655 ± 0.025 sec	(1972HA58)
	1.67 ± 0.02 sec	(1970AL11)
	1.69 ± 0.04 sec	(1970AS06)
	1.47 ± 0.10 sec	(1963FR10, FR64, 1965FR09)
	1.46 ± 0.07 sec	(1961BU05)
	1.7 ± 0.4 sec	(1961EC02)
	1.6 ± 0.2 sec	(1954GO17)

Previous Measurements

 

Decay to 18F* (MeV)	Jπ; T	Eγ (keV)		Ei → Ef (keV)	Branching Ratio (%)		log f0t			Iγ c
							a	F	K b	K
0	1+; 0				E	92.5 ± 0.2	3.094 ± 0.005	3.088 ± 0.003	3.096 ± 0.004
					F d, K	92.11 ± 0.21
1.04 e	0+; 1	A	1041 ± 5	1042 → 0	A	7 ± 2	3.456 ± 0.012	3.468 ± 0.013	3.473 ± 0.013	7.83 ± 0.21
		B	1035 ± 5
		C	1030 ± 20		C	9 ± 3
		D	1043 ± 1		E	7.3 ± 0.2
		F	1041.3 ± 1.0		F d	7.66 ± 0.21
		J	1041.5 ± 0.3		J	7.70 ± 0.21
		K	1041.55 ± 0.08		K	7.70 ± 0.21
1.08 e	0-; 0			1081 → 0	D	< 0.7	7.20 ± 0.11		7.012 ± 0.059	(2.26 ± 0.21) x 10-3
		G	1080.5 ± 0.1		G f	(1.3 ± 0.3) x 10-3
					H	(2.28 ± 0.17) x 10-3
		J	1080.7 ± 0.5		J	(2.14 ± 0.26) x 10-3
		K	1080.76 ± 0.13		K	(2.07 ± 0.28) x 10-3
1.70	1+; 0			1701 → 0	E	0.17 ± 0.05	4.43 ± 0.06 g	4.38 ± 0.05	4.477 ± 0.015	0.0538 ± 0.0018
		F	1699.6 ± 2.0		F d	0.23 ± 0.03
					G f	0.19 ± 0.04
		J	1699.9 ± 0.3		J	0.183 ± 0.006
		K	1700.81 ± 0.18		K	0.188 ± 0.006
		F	659.4 ± 1.0	1701 → 1042						0.135 ± 0.005
		J	659.0 ± 0.3
		K	659.26 ± 0.20
2.10	2-; 0				D	< 1.5

A: (1961BU05)

B: (1961EC02)

C: (1963FR04, FR64, 1965FR09)

D: (1968GO05)

E: (1970AS06)

F: (1975HA21)

G: (1981AD01)

H: (1982DAZZ)

J: (1982HE04)

K: (1983AD03)

a) Based on Qm and T1/2 = 1.672 ± 0.004 sec.

b) Based on T1/2 = 1.672 ± 0.008 sec.

c) γ-ray intensities are per 100 parent decays.

d) Adopted value.

e) The splitting of the 0+ and 0- states is 39.20 ± 0.11 keV (1983AD03).

f) and E.G. Adelberger, private communication to Fay Ajzenberg-Selove, (1983AJ01).

g) Calculated assuming branch = 0.21 ± 0.03 %.

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¹⁸N(β^-)¹⁸O Evaluated Data

¹⁸F(β⁺)¹⁸O Evaluated Data

A = 18 Beta-Decays Diagram

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Last modified: 17 November 2007