8Li

β--Decay Evaluated Data



Measurements
1947HU06: 8Li.
1951RA12: 8Li; measured T1/2.
1952Sh44: 8Li; measured T1/2.
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 T1/2; deduced log ft.
1968DA12: 8Li; measured T1/2.
1970SC34: 8Li; measured β-delayed α-spectrum. 8Be deduced level.
1971WI05: 8Li; measured delayed α spectra, T1/2.
1982FI03: 8Li; measured β-delayed Eα, Iα.
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 T1/2, Eα, Iα.
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 T1/2. 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 Iβ(θ, E); deduced alignment correlation terms. β-NMR method.
1994RE1R, 1991RE02: 8Li(β-n); measured T1/2, neutron emission probabilities.
1995SH22: 8Li(β-); measured β-ray counting rates, β-NMR.
1995YAZZ: 8Li(β-); measured Iβ(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 Eβ; deduced Qβ, T1/2. ISOL.
2002BH03: 8Li(β-); analyzed β-delayed Eα. 8Be deduced R-matrix parameters.
2002TA22: 8Li(β-); measured Eβ, 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 Eβ, T1/2.
2004MUZY: 8Li(β-); measured β-delayed Eγ, Iγ, βγ-coin.
2005BO45: 8Li(β-); measured β-asymmetries, β-NMR spectra. 8Li deduced quadrupole moments.
2005MU26: 8Li(β-); measured Eγ, βγ-coin.
2006BH03: 8Li(β-α); measured β-delayed Eα; 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 Eβ, Iβ, half-life.
2011SU16: 8Li(β-); measured Eβ, Iβ, β(θ) from spin polarized 8Li; deduced alignment and βα angular correlation terms and contributing matrix elements, weak magnetism term. β-NMR technique.
2013LI12: 8Li(β-); measured decay products, Eα, Iα; deduced α-β-ν correlation in the Gamow-Teller decay, limit on tensor component contribution.
2015DU14: 8Li(β-); measured decay products, Eα, Iα; deduced 8Li yields.
2015ST15: 8Li(β-); measured decay products, Eβ, Iβ, Eα, Iα.

Measured half-life for 8Li(β-)8Be

Recommended value (August, 2015): 838.79 ± 0.36 ms
Summary Table of Uncertainty Analysis: Table 08Li preview (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%.

8He(β-)8Li Evaluated Data

8B(β+)8Be Evaluated Data

A = 8 Beta-Decays Diagram

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Last modified: 21 May 2018