Information on mass chains and nuclides

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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 (1968ST1J): Γ < 0.2 MeV (1973LI02).

GENERAL:

See (1960GO1B, 1965BO1C, 1965LA1B, 1967CO36, 1970LO1E, 1972CA37, 1972GA1L, 1972PN1A, 1973JU2A) and (1966LA04).

1. 7Li(t, 3He)7He	Qm = -11.18
	Q0 = -11.18 ± 0.03 (1968ST1J).

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 (1967ST04, 1968ST1J). See also (1968CE01).

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 (1973LI02). See also (1967ME11, 1971KO24) and ⁸Li.

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

Qm = -17.20

Not reported.