1974AL11: ¹⁴B; measured βγ-coin, T_1/2, E_γ; deduced log ft, J, π. ¹⁴C deduced levels.

1986CU01, 1986HAYX: ¹⁴B(β^-); measured β-decay T_1/2.

1992AS01, 1992OKZT, 1992OKZV: ¹⁴B(β^-); measured g-factor.

1993ASZZ, 1994ASZZ: ¹⁴B(β^-); measured NMR. ¹⁴B deduced μ.

1993REZX: ¹⁴B(β^-n); measured β-delayed neutron average energies.

1994UE04, 1995OK04, 1996IZ01, 1996IZ02, 1996IZZY, 1996OKZZ: ¹⁴B(β^-); measured β NMR, polarized sources; deduced μ.

1995BE25: ¹⁴Be(β^-n); measured β-delayed neutron spectra, βn-coin, E_γ, _γ; deduced log ft, branching ratios. ¹⁴B deduced β-decay T_1/2, possible level.

1996OGZY: ¹⁴B(β^-); measured E_β, β-delayed E_γ. ¹⁴C deduced β-feeding branching from parent, levels, J, π.

Measured half-life for ¹⁴B(β^-)¹⁴C

Adopted value:	13.8 ± 1.0 ms:	weighted mean of (1974AL11 and 1986CU01)
Measured values:	16.1 ± 1.2 ms	(1974AL11)
	12.8 ± 0.8 ms	(1986CU01)

Previous Measurements

 

Decay to 14C* (MeV)	Jπ	Branching Ratio (%) a	log ft
		(1974AL11)	(1974AL11)	b
0	0+	(5 ± 3) c		(6.1 ± 0.3)
6.09 d	1-	81 ± 9	4.22 ± 0.05	4.16 ± 0.06
6.73	3-	8.6+1.7-4.0	5.10+0.30-0.08	5.04+0.27-0.08
7.34	2-	< 11 e	> 4.9	> 4.8

a) The measured γ-ray intensity ratios are I6.09/I6.73/I7.34 = 100/(10.0 ± 2.0)/< 2.2 (1974AL11).

b) M.J. Martin, private communication to Fay Ajzenberg-Selove (1991AJ01).

c) This branch has not been observed. It is assumed to be 5 ± 3 % in the calculation of the branching ratios to 14C*(6.09, 6.73). However, (1975MI12; theor.) suggest that the branch may be as small as ≈ 0.3%. The errors shown for the branching ratios reflect this uncertainty (1974AL11).

d) Eβ-(max) = 14.0 ± 0.7 MeV to this state.

e) This branch has not been observed: the upper limit is shown. In the calculations of the branching ratios to 14C*(6.09, 6.73) a value 5 ± 5 % was used.

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¹⁴C(β^-)¹⁴N Evaluated Data

¹⁴O(β⁺)¹⁴N Evaluated Data

A = 14 Beta-Decays Diagram

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Last modified: 21 May 2008