14Be

β--Decay Evaluated Data



Measurements
1986CU01, 1986HAYX, 1987MIZU: 14Be(β-); measured β-decay T1/2.
1987DUZU: 14Be; measured β-delayed neutron multiplicities.
1988DU09: 14Be(β-n); measured β-delayed neutron spectra; deduced T1/2, multi-neutron branching ratios.
1988DUZT: 14Be(β-n); measured β-delayed xn emission, associated multiplicity, x = 0-4, T1/2 for 14Be.
1994KIZY, 1995AOZZ, 1995BE25, 1996AOZX: 14Be(β-); measured β-delayed neutron spectra, βn-coin, Eγ, Iγ; deduced log ft, branching ratios. 14B deduced β-decay T1/2, possible level.
1994RE1R, 1991RE02: 14Be(β-n); measured T1/2, neutron emission probabilities.
1997AO01: 14Be(β-); measured βnγ-coin; deduced log ft. 11Be, 14B deduced levels, Gamow-Teller branchings.
1997AO04: 14Be(β-); measured beta-delayed neutron-, γ-spectra, γγγ-coin; deduced log ft, halo neutron related features. 14B deduced levels. Tof.
1997BE66: 14Be(β-); measured β-delayed neutron spectra, β(neutron)-coin, T1/2. 14B deduced level, possible J, π.
1999BE53: 14Be(β-); measured β-delayed neutrons, βn and nn time correlations. 14Be deduced neutron emission probabilities, branching ratios.
2002AO03: 14Be(β-), (β-n); measured Eβ, β-delayed En, Eγ, nγ-coin, T1/2; deduced branching ratios, log ft. 14B deduced level J, π, width.
2002BE53: 14Be(β-); measured β-delayed neutrons, charged particles; deduced decay branching ratios.
2002JE11: 14Be(β-); measured β-delayed charged particle spectra, branching ratios, β-delayed neutron spectra.
2002JE14: 14Be(β-); measured β-delayed triton and α spectra; deduced branching ratios, Gamow-Teller strength distribution.

Measured half-life for 14Be(β-)14B

Recommended value (August, 2015): 4.65 ± 0.20 ms (Weighted Average with uncertainty doubled)
Summary Table of Uncertainty Analysis:    Table 14Be preview (PDF)  
Measured values: 4.84 ± 0.10 ms (2002AO03)
4.29 ± 0.18 ms (1997BE66)
4.8 ± 0.2 ms (1994RE1R: see also (1991RE02) and 4.78 ± 0.19 ms in the unpublished
private communications of (2008REZZ)/(1995REZZ).)
4.0 ± 1.2 ms (from β-n coincidence data); 4.8 ± 0.2 ± 0.4 ms (from β-decay curve) (1995BE25)
4.35 ± 0.17 ms (1988DU09)
4.2 ± 0.7 ms (1986CU01)
Other Reviews: 4.53 ± 0.27 ms (2015BI05)

Previous Measurements

 

Branching Ratio (%) log ft
Reference P0n P1n P2n Decay to 14B*(MeV)
0, 0.74 (1.28) (1.28), 1.38, 1.86, 2.08, 2.97, (4.31)
(1988DU09) 14 ± 3 81 ± 4 5 ± 2        
(1999BE53) < 4    > 96 < 1.6 a < 4   ≈ 100  
(2002AO03) < 0.6 94 ± 5 6 ± 5 < 0.6 91 ± 9   3.68 ± 0.05
a) P2n + P3n.

14B(β-)14C Evaluated Data

14C(β-)14N Evaluated Data

14O(β+)14N Evaluated Data

A = 14 Beta-Decays Diagram

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Last modified: 21 May 2018