Information on mass chains and nuclides available on this website:

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GENERAL: See also (66LA04).

Theoretical and review papers: (KR69D, SO69A, KR70C, RY70B, LO71E, RY71, DO71F, PN72, ST72F).

Experimental papers: (DE66K, PO66H, CO67A, PO67N, BA68UU, BH68B, CA70J, CA71H, CA72J, VO72C, JU73B, KO73F).

Mass of ⁸He: The atomic mass excess of ⁸He derived from the Q of the ²⁶Mg(α, ⁸He)²²Mg reaction is 31.65 ± 0.12 MeV. See also (BA68UU). ⁸He is then stable to decay into ⁶He + 2n by 2.1 MeV (CE66A). See also (BA66V, CE68A, CE72).

1. 8He(β-)8Li

Qm = 10.70

The half-life is 122 ± 2 msec. The decay takes place 88% to ⁸Li*(0.98) [log ft = 4.20; B. Zimmerman, private communication] and 12 ± 1% via ⁸Li states decaying by neutron emission (PO65H). See also (NE66C) and (HA73M; theor.).

2. 11B(γ, 3p)8He

Qm = -44.85

See (NE66C).

3. 26Mg(α, 22Mg)8He

Qm = -45.05

This reaction has been studied at E_α = 80 MeV (CE66A).