(See the Isobar Diagram for 8He)
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).
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.).
This reaction has been studied at Eα = 80 MeV (CE66A).