(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 (1968BA48). 8He is then stable to decay into 6He + 2n by 2.1 MeV (1966CE01). See also (1966BA38, 1968CE1A, 1972CE1A).
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 (1965PO06). See also (1966NE07) and (1973HA49; theor.).
This reaction has been studied at Eα = 80 MeV (1966CE01).