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7B (1974AJ01)
(See the Isobar Diagram for 7B)
| 1. 10B(3He, 6He)7B | Qm = -18.55 |
A 6He group corresponding to the unbound ground state of 7B has been identified at E(3He) = 50 MeV: M - A (7B) = 27.94 ± 0.10, Γ = 1.4 ± 0.2 MeV. The isobaric quartet mass law would predict M - A = 27.76 ± 0.17 MeV. 7B is unbound with respect to 6Be + p (Q = 2.27), 5Li + 2p (Q = 1.68), 4He + 3p (Q = 3.65). The expected single-particle width is Γ = 0.64 MeV: it is suggested that the two-proton and three-proton decays make an appreciable contribution to the width (1967MC14). See also (1960GO1B, 1968CE01, 1968ST1J, 1969GA1P, 1972CA37, 1972CE1A).