1963NE07: ⁸He; measured not abstracted; deduced nuclear properties.

1965PO06: ⁸He; measured not abstracted; deduced nuclear properties.

1966NE07: ⁸He; measured T_1/2, E_γ, βγ-coin.

1973AN11: ⁸He; measured decay probability.

1981BJ03: ⁸He; measured β-delayed E_n, I_n, βγ-coin, T_1/2; deduced delayed neutron branching, log ft.

1986BO41: ⁸He(β^-); measured β-delayed triton branching ratios, spectra; deduced log ft. ⁸Li deduced level.

1991BO31: ⁸He; measured continuum particle spectra following β-decay; deduced log ft, Gamow-Teller transition strength, level width, di-neutron, neutron halo roles.

1991LUZZ: ⁸He; measured T_1/2.

1993BO24: ⁸He(β^-); measured β-delayed deuteron spectrum; deduced branching ratio. ⁸Li deduced level.

1994JO04: ⁸He(β^-); compiled, reviewed β-decay data; deduced halo role.

1995REZZ: ⁸He; measured T_1/2, neutron emission probabilities.

1996BA66: ⁸He(β^-); analyzed β-decay delayed triton spectra. ⁸Li levels deduced parameters, B(GT), branching ratios, log ft.

1997SO34: ⁸He(β^-n); measured decay products, E_n, I_n; deduced neutron emission probabilities.

2003BE05: ⁸He; measured E_β, β-delayed neutron spectra, neutron emission probability, T_1/2.

2005MI30: ⁸He(β^-); analyzed transitions B(GT).

2010MI01: ⁸He(β^-); measured recoils, β-delayed decays, E_α, I_α, I_t, E_t, I_n, E_n; deduced feasibilityof β-decay studies of ⁸He.

2010LE19: ⁸He(β^-); measured E_γ.

2014AR10: ⁸He(β^-α); measured decay products, E_α, I_α; deduced ranges, energy distributions.

Measured half-life for ⁸He(β^-)⁸Li

Recommended value (September, 2015):	119.0 ± 1.6 ms	(Weighted Average)
Summary Table of Uncertainty Analysis:	(PDF)
Measured values:	116 ± 43 ms	(From the unpublished private communications of (2008REZZ)/(1995REZZ))
	103 ± 7 ms	(2003BE05)
	124.5 ± 0.2 ms	(1997SO34) (Excluded: insufficient experimental details)
	124.6 ± 5.0 ms	(1991LUZZ)
	117.5 ± 1.5 ms	(1981BJ03)
	120 ms	(1973AN11) (Excluded)
	114 ± 25 ms	(1966NE07)
	122 ± 2 ms	(1965PO06)
	30 ± 20 ms	(1963NE07) (Excluded)
Other Reviews:	119.4 ± 1.5 ms	(2015BI05)

Previous Measurements

 

Decay to 8Li* (MeV)	Jπ	Branching Ratio (%)			Log ft
		(1965PO06)	(1981BJ03)	(1986BO41)	a	b	(1981BJ03)	(1986BO41)	(1988BA67, 1996BA66)
0.98	1+	88%	(84 ± 1)%		4.20	4.19	4.20		4.20
3.21	1+ d	(12 ± 1)%	(16 ± 1)%					5.0	4.52
5.4	1+ e								4.53
≈ 9.67 c	1+			(0.9 ± 0.1)%				4.3	2.91

a) B. Zimmerman, private communication to Fay Ajzenberg-Selove (1974AJ01).

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

c) (1986BO41) assume level at 8.8 MeV with Jπ = 1+.

d) (1981BJ03) suggest π = +.

e) (1981BJ03) suggest Jπ = 0+ or 1 +.

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⁸B(β⁺)⁸Be Evaluated Data

A = 8 Beta-Decays Diagram

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Last modified: 28 June 2021