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USNDP

8He (1974AJ01)


(See the Isobar Diagram for 8He)

GENERAL: See also (1966LA04).

Theoretical and review papers: (1969KR20, 1969SO08, 1970KR1G, 1970RY04, 1971LO13, 1971RY1A, 1971DO1F, 1972PN1A, 1972ST1C).

Experimental papers: (1966DE14, 1966PO09, 1967CO1K, 1967PO1D, 1968BA48, 1968BH1A, 1970CA1M, 1971CA47, 1972CA38, 1972VO06, 1973JU2A, 1973KO1D).

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).

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 (1965PO06). See also (1966NE07) and (1973HA49; theor.).

2. 11B(γ, 3p)8He Qm = -44.85

See (1966NE07).

3. 26Mg(α, 22Mg)8He Qm = -45.05

This reaction has been studied at Eα = 80 MeV (1966CE01).