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Mass of ⁷He: From the Q of the ⁷Li(t, ³He)⁷He reaction, the atomic mass excess of ⁷He is 26.11 ± 0.03 MeV. ⁷He is unbound with respect to ⁶He + n by 0.44 ± 0.03 MeV (ST68): Γ < 0.2 MeV (LI73D).

GENERAL:

See (GO60P, BO65B, LA65D, CO67A, LO70F, CA72P, GA72L, PN72, JU73B) and (66LA04).

1. 7Li(t, 3He)7He	Qm = -11.18
	Q0 = -11.18 ± 0.03 (ST68).

The ³He particles to the ground state of ⁷He have been observed at E_t = 22 MeV. The width of the ground state is 160 ± 30 keV; for a radius of 2.2 fm and l_n = 1, this width is 0.22 of the Wigner limit. The angular distribution is peaked in the forward direction. No other states of ⁷He were observed for E_x < 2.4 MeV (ST67D, ST68). See also (CE68A).

2. 7Li(n, p)7He

Qm = -10.42

At E_n = 14.8 MeV, a proton group is reported corresponding to ⁷He_g.s.: Γ < 0.2 MeV (LI73D). See also (ME67L, KO71L) and ⁸Li.

3. 9Be(n, 3He)7He

Qm = -17.20

Not reported.