1947HU06: ⁸Li.

1951RA12: ⁸Li; measured T_1/2.

1952Sh44: ⁸Li; measured T_1/2.

1953BU35: ⁸Li.

1954KL36: ⁸Li.

1954WI25: ⁸Li.

1955FR29: ⁸Li.

1958VE20: ⁸Li.

1959FA02: ⁸Li.

1959IM04: ⁸Li.

1960JA12: ⁸Li; measured not abstracted; deduced nuclear properties.

1962NE14: ⁸Li; measured not abstracted; deduced nuclear properties.

1966CL02: ⁸Li; measured T_1/2; deduced log ft.

1968DA12: ⁸Li; measured T_1/2.

1970SC34: ⁸Li; measured β-delayed α-spectrum. ⁸Be deduced level.

1971WI05: ⁸Li; measured delayed α spectra, T_1/2.

1982FI03: ⁸Li; measured β-delayed E_α, I_α.

1983HAZE: ⁸Li(β^-); measured β asymmetry.

1985TAZO: ⁸Li(β^-); measured β-asymmetry, NMR; deduced polarization.

1986WA01: ⁸Li(β^-); analyzed β-delayed breakup α-spectra; deduced intruder states role. ⁸Be deduced level, Γ, Gamow-Teller matrix elements.

1987AR22: ⁸Li(β^-); measured β-asymmetry, NMR, hfs. ⁸Li deduced μ.

1987NO04: ⁸Li(β^-); measured NMR spectra, β-asymmetry; deduced polarization.

1988AR17: ⁸Li(β^-); measured β asymmetry, β-NMR spectra; ⁸Li level deduced nuclear quadrupole moment.

1988HA21: ⁸Li(β^-); measured β-decay asymmetry vs E(β).

1989BA31: ⁸Be(α) [from ⁸Li(β^--decay)]; calculated α-spectra. ⁸Be deduced possible broad 2⁺ intruder state. Many-level R-matrix fit, other input.

1990SA16: ⁸Li(β^-); measured T_1/2, E_α, I_α.

1991OHZT: ⁸Li(β^-); measured NMR, β-ray asymmetry. ⁸Li deduced spin polarization. β-NMR method.

1992NAZM: ⁸Li(β^-); measured NMR, β-ray asymmetry. ⁸Li deduced Q. β-NMR method.

1992TAZP: ⁸Li(β^-); measured T_1/2. ⁸Be deduced levels, ft-value asymmetries.

1993ARZY: ⁸Li(β^-); measured NQR in LiNbO3 and LiIO3; deduced quadrupole coupling constants. ⁸Li deduced quadrupole moment.

1993BU29: ⁸Li(β^-); measured β-NMR.

1993MI34: ⁸Li(β^-); measured modified β-NMR spectra in LiO3, LiNbO3; deduced quadrupole moment, quadrupole coupling constants.

1993MO28: ⁸Li(β^-); measured β-decay end point energy.

1994JA05: ⁸Li(β^-); measured NMR; deduced quadrupole moment sign.

1994MIZV: ⁸Li(β^-); easured I_β(θ, E); deduced alignment correlation terms. β-NMR method.

1994RE1R, 1991RE02: ⁸Li(β^-n); measured T_1/2, neutron emission probabilities.

1995SH22: ⁸Li(β^-); measured β-ray counting rates, β-NMR.

1995YAZZ: ⁸Li(β^-); measured I_β(θ), β delayed α anisotropy from ⁸Be; deduced alignment correlation coefficient.

1996BA66: ⁸He(β^-); ⁸Li levels deduced parameters, B(GT), branching ratios, log ft. R-matrix approach.

1996SR02: ⁸Li(β^-); measured electron transverse polarizations, time reversal violating triple correlation R.

1999SR06: ⁸Li(β^-); analyzed data from polarized source; deduced time-reversal violation features.

2000KOZJ: ⁸Li(β^-); measured E_β; deduced Q_β, T_1/2. ISOL.

2000SAZP, 2001OG12: ⁸Li(β^-); measured β-NMR spectra.

2002AB19: ⁸Li(β^-); measured β-NMR spectra.

2002BH03: ⁸Li(β^-); analyzed β-delayed E_α. ⁸Be deduced R-matrix parameters.

2002MO44: ⁸Li(β^-); measured β-asymmetry.

2002TA22: ⁸Li(β^-); measured E_β, βα-coin.

2003HU06: ⁸Li(β^-); measured β-decay asymmetry from polarized source; deduced time reversal violating triple correlation parameter, scalar leptoquark mass limit.

2003WI17: ⁸Li(β^-); measured E_β, T_1/2.

2004MUZY: ⁸Li(β^-); measured β-delayed E_γ, I_γ, βγ-coin.

2004SU29: ⁸Li(β⁺α); measured E_β, βα-coin, angular correlations following decay of polarized source; deduced alignment correlation terms.

2005BO45: ⁸Li(β^-); measured β-asymmetries, β-NMR spectra. ⁸Li deduced quadrupole moments.

2005MU26: ⁸Li(β^-); measured E_γ, βγ-coin.

2006BH03: ⁸Li(β^-α); measured β-delayed E_α; deduced final-state continuum shapes. R-matrix analysis, comparison with previous results.

2007SUZX: ⁸Li(βα); measured β(θ, H, t) from polarized sources.

2010FL01: ⁸Li(β^-); measured E_β, I_β, half-life.

2011SU16: ⁸Li(β^-); measured E_β, I_β, β(θ) from spin polarized ⁸Li; deduced alignment and βα angular correlation terms and contributing matrix elements, weak magnetism term. β-NMR technique.

2011VO08, 2014VO01: ⁸Li; measured β-NQR spectra; deduced electric quadrupole moments. measured E_β, I_β, half-life.

2012SC09: ⁸Li(β^-), (β^-α); measured decay products, E_β, I_β, E_α, I_α, nuclear recoils; deduced technique for the β-ν angular correlations.

2013LI12: ⁸Li(β^-); measured decay products, E_α, I_α; deduced α-β-ν correlation in the Gamow-Teller decay, limit on tensor component contribution.

2015DU14: ⁸Li(β^-), (β^-α); measured decay products, E_α, I_α; deduced ⁸Li yields.

2015ST15: ⁸Li(β^-); measured decay products, E_β, I_β, E_α, I_α.

2019BU23: ⁸Li(β^-); measured decay products, E_β, I_β; deduced correlations.

Measured half-life for ⁸Li(β^-)⁸Be

Recommended value (August, 2015):	838.79 ± 0.36 ms
Summary Table of Uncertainty Analysis:	(PDF)
Measured values:	838.40 ± 0.36 ms	(2010FL01)
	839.60 ± 1.06 ms	(2003WI17)
	858 ± 16 ms	(1994RE1R: see also (1991RE02).)
	840.3 ± 0.9 ms	(1990SA16)
	836 ± 3 ms	(1979MI1E)
	838 ± 6 ms	(1971WI05)
	854 ± 8 ms	(1968DA12)
	844.0 ± 0.7 ms	(1966CL02) (Excluded: no dead time correction)
	820 ± 20 ms	(1962NE14)
	848 ± 5 ms	(1960JA12)
	840 ± 20 ms	(1959FA02)
	880 ± 30 ms	(1959IM04) (Excluded)
	873 ± 13 ms	(1958VE20) (Excluded)
	841 ± 4 ms	(1954KL36)
	840 ± 40 ms	(1954WI25)
	875 ± 20 ms	(1953BR1B) (Excluded)
	890 ± 10 ms	(1953BU35) (Excluded)
	850 ± 16 ms	(1952SH44)
	825 ± 20 ms	(1951RA12)
	890 ± 20 ms	(1947HU06) (Excluded)

Previous Measurements

 

Decay to 8Be* (MeV)	Branching Ratio (%)		Log ft
	(1950HO01)	(1955FR29, 1958VE20)	(1951FE1A)	(1955FR29, 1958VE20)	(1966BA1A)	a	b	(1986WA01)	c	(1989BA31)
0	< 2%	< 1%		> 8
3.0	≈ 90%	89%	5.60	5.67	5.617	5.61	5.60	5.37	≥ 5.6	5.72
Higher States: possibly 11.7		11%		4.6

a) Taking T1/2 = 842 ms and Q = 16.006 - 2.94 MeV (B. Zimmerman, private communication to Fay Ajzenberg-Selove (1974AJ01)).

b) M.J. Martin, private communication to Fay Ajzenberg-Selove (1984AJ01).

c) Using T1/2 = 839.9 ms, Q = 16.0052 MeV and branching ratio ≤ 100%.

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⁸B(β⁺)⁸Be Evaluated Data

A = 8 Beta-Decays Diagram

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Last modified: 28 June 2021