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GENERAL: See also (1974AJ01) and Table 7.1 [Table of Energy Levels] (in PDF or PS).

See (1974IR04, 1974TH01, 1975PN1A, 1976TR1A, 1977DO06, 1977SH1C, 1978DA06).

1. 7Li(π-, γ)7He

Qm = 128.37

The radiative capture has been observed to the ground state of ⁷He. The (M1) transition is seen E_γ = 126.6 MeV (1976AL1F). See also (1976TR1A).

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 (1976KI1D).

3. 7Li(t, 3He)7He

Qm = -11.18

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, 1969ST02).

4. 9Be(6Li, 8B)7He

Qm = -23.60

At E(⁶Li) = 80.0 and 93.3 MeV the ground state of ⁷He is strongly populated, indicating negative parity, as expected. There is no indication of relatively sharp states of ⁷He with E_x ≲ 10 MeV (1977WE03, 1977WE1B). See also (1974CE1A).